Merge tag 'pm+acpi-4.6-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management and ACPI updates from Rafael Wysocki:
 "This time the majority of changes go into cpufreq and they are
  significant.

  First off, the way CPU frequency updates are triggered is different
  now.  Instead of having to set up and manage a deferrable timer for
  each CPU in the system to evaluate and possibly change its frequency
  periodically, cpufreq governors set up callbacks to be invoked by the
  scheduler on a regular basis (basically on utilization updates).  The
  "old" governors, "ondemand" and "conservative", still do all of their
  work in process context (although that is triggered by the scheduler
  now), but intel_pstate does it all in the callback invoked by the
  scheduler with no need for any additional asynchronous processing.

  Of course, this eliminates the overhead related to the management of
  all those timers, but also it allows the cpufreq governor code to be
  simplified quite a bit.  On top of that, the common code and data
  structures used by the "ondemand" and "conservative" governors are
  cleaned up and made more straightforward and some long-standing and
  quite annoying problems are addressed.  In particular, the handling of
  governor sysfs attributes is modified and the related locking becomes
  more fine grained which allows some concurrency problems to be avoided
  (particularly deadlocks with the core cpufreq code).

  In principle, the new mechanism for triggering frequency updates
  allows utilization information to be passed from the scheduler to
  cpufreq.  Although the current code doesn't make use of it, in the
  works is a new cpufreq governor that will make decisions based on the
  scheduler's utilization data.  That should allow the scheduler and
  cpufreq to work more closely together in the long run.

  In addition to the core and governor changes, cpufreq drivers are
  updated too.  Fixes and optimizations go into intel_pstate, the
  cpufreq-dt driver is updated on top of some modification in the
  Operating Performance Points (OPP) framework and there are fixes and
  other updates in the powernv cpufreq driver.

  Apart from the cpufreq updates there is some new ACPICA material,
  including a fix for a problem introduced by previous ACPICA updates,
  and some less significant changes in the ACPI code, like CPPC code
  optimizations, ACPI processor driver cleanups and support for loading
  ACPI tables from initrd.

  Also updated are the generic power domains framework, the Intel RAPL
  power capping driver and the turbostat utility and we have a bunch of
  traditional assorted fixes and cleanups.

  Specifics:

   - Redesign of cpufreq governors and the intel_pstate driver to make
     them use callbacks invoked by the scheduler to trigger CPU
     frequency evaluation instead of using per-CPU deferrable timers for
     that purpose (Rafael Wysocki).

   - Reorganization and cleanup of cpufreq governor code to make it more
     straightforward and fix some concurrency problems in it (Rafael
     Wysocki, Viresh Kumar).

   - Cleanup and improvements of locking in the cpufreq core (Viresh
     Kumar).

   - Assorted cleanups in the cpufreq core (Rafael Wysocki, Viresh
     Kumar, Eric Biggers).

   - intel_pstate driver updates including fixes, optimizations and a
     modification to make it enable enable hardware-coordinated P-state
     selection (HWP) by default if supported by the processor (Philippe
     Longepe, Srinivas Pandruvada, Rafael Wysocki, Viresh Kumar, Felipe
     Franciosi).

   - Operating Performance Points (OPP) framework updates to improve its
     handling of voltage regulators and device clocks and updates of the
     cpufreq-dt driver on top of that (Viresh Kumar, Jon Hunter).

   - Updates of the powernv cpufreq driver to fix initialization and
     cleanup problems in it and correct its worker thread handling with
     respect to CPU offline, new powernv_throttle tracepoint (Shilpasri
     Bhat).

   - ACPI cpufreq driver optimization and cleanup (Rafael Wysocki).

   - ACPICA updates including one fix for a regression introduced by
     previos changes in the ACPICA code (Bob Moore, Lv Zheng, David Box,
     Colin Ian King).

   - Support for installing ACPI tables from initrd (Lv Zheng).

   - Optimizations of the ACPI CPPC code (Prashanth Prakash, Ashwin
     Chaugule).

   - Support for _HID(ACPI0010) devices (ACPI processor containers) and
     ACPI processor driver cleanups (Sudeep Holla).

   - Support for ACPI-based enumeration of the AMBA bus (Graeme Gregory,
     Aleksey Makarov).

   - Modification of the ACPI PCI IRQ management code to make it treat
     255 in the Interrupt Line register as "not connected" on x86 (as
     per the specification) and avoid attempts to use that value as a
     valid interrupt vector (Chen Fan).

   - ACPI APEI fixes related to resource leaks (Josh Hunt).

   - Removal of modularity from a few ACPI drivers (BGRT, GHES,
     intel_pmic_crc) that cannot be built as modules in practice (Paul
     Gortmaker).

   - PNP framework update to make it treat ACPI_RESOURCE_TYPE_SERIAL_BUS
     as a valid resource type (Harb Abdulhamid).

   - New device ID (future AMD I2C controller) in the ACPI driver for
     AMD SoCs (APD) and in the designware I2C driver (Xiangliang Yu).

   - Assorted ACPI cleanups (Colin Ian King, Kaiyen Chang, Oleg Drokin).

   - cpuidle menu governor optimization to avoid a square root
     computation in it (Rasmus Villemoes).

   - Fix for potential use-after-free in the generic device properties
     framework (Heikki Krogerus).

   - Updates of the generic power domains (genpd) framework including
     support for multiple power states of a domain, fixes and debugfs
     output improvements (Axel Haslam, Jon Hunter, Laurent Pinchart,
     Geert Uytterhoeven).

   - Intel RAPL power capping driver updates to reduce IPI overhead in
     it (Jacob Pan).

   - System suspend/hibernation code cleanups (Eric Biggers, Saurabh
     Sengar).

   - Year 2038 fix for the process freezer (Abhilash Jindal).

   - turbostat utility updates including new features (decoding of more
     registers and CPUID fields, sub-second intervals support, GFX MHz
     and RC6 printout, --out command line option), fixes (syscall jitter
     detection and workaround, reductioin of the number of syscalls
     made, fixes related to Xeon x200 processors, compiler warning
     fixes) and cleanups (Len Brown, Hubert Chrzaniuk, Chen Yu)"

* tag 'pm+acpi-4.6-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (182 commits)
  tools/power turbostat: bugfix: TDP MSRs print bits fixing
  tools/power turbostat: correct output for MSR_NHM_SNB_PKG_CST_CFG_CTL dump
  tools/power turbostat: call __cpuid() instead of __get_cpuid()
  tools/power turbostat: indicate SMX and SGX support
  tools/power turbostat: detect and work around syscall jitter
  tools/power turbostat: show GFX%rc6
  tools/power turbostat: show GFXMHz
  tools/power turbostat: show IRQs per CPU
  tools/power turbostat: make fewer systems calls
  tools/power turbostat: fix compiler warnings
  tools/power turbostat: add --out option for saving output in a file
  tools/power turbostat: re-name "%Busy" field to "Busy%"
  tools/power turbostat: Intel Xeon x200: fix turbo-ratio decoding
  tools/power turbostat: Intel Xeon x200: fix erroneous bclk value
  tools/power turbostat: allow sub-sec intervals
  ACPI / APEI: ERST: Fixed leaked resources in erst_init
  ACPI / APEI: Fix leaked resources
  intel_pstate: Do not skip samples partially
  intel_pstate: Remove freq calculation from intel_pstate_calc_busy()
  intel_pstate: Move intel_pstate_calc_busy() into get_target_pstate_use_performance()
  ...

1 files changed, 701 insertions, 180 deletions

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 3fa94e291d16..20a257a12ea5 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -38,12 +38,15 @@
 #include <string.h>
 #include <ctype.h>
 #include <sched.h>
+#include <time.h>
 #include <cpuid.h>
 #include <linux/capability.h>
 #include <errno.h>
 
 char *proc_stat = "/proc/stat";
-unsigned int interval_sec = 5;
+FILE *outf;
+int *fd_percpu;
+struct timespec interval_ts = {5, 0};
 unsigned int debug;
 unsigned int rapl_joules;
 unsigned int summary_only;
@@ -72,6 +75,7 @@ unsigned int extra_msr_offset64;
 unsigned int extra_delta_offset32;
 unsigned int extra_delta_offset64;
 unsigned int aperf_mperf_multiplier = 1;
+int do_irq = 1;
 int do_smi;
 double bclk;
 double base_hz;
@@ -86,6 +90,10 @@ char *output_buffer, *outp;
 unsigned int do_rapl;
 unsigned int do_dts;
 unsigned int do_ptm;
+unsigned int do_gfx_rc6_ms;
+unsigned long long  gfx_cur_rc6_ms;
+unsigned int do_gfx_mhz;
+unsigned int gfx_cur_mhz;
 unsigned int tcc_activation_temp;
 unsigned int tcc_activation_temp_override;
 double rapl_power_units, rapl_time_units;
@@ -98,6 +106,12 @@ unsigned int crystal_hz;
 unsigned long long tsc_hz;
 int base_cpu;
 double discover_bclk(unsigned int family, unsigned int model);
+unsigned int has_hwp;	/* IA32_PM_ENABLE, IA32_HWP_CAPABILITIES */
+			/* IA32_HWP_REQUEST, IA32_HWP_STATUS */
+unsigned int has_hwp_notify;		/* IA32_HWP_INTERRUPT */
+unsigned int has_hwp_activity_window;	/* IA32_HWP_REQUEST[bits 41:32] */
+unsigned int has_hwp_epp;		/* IA32_HWP_REQUEST[bits 31:24] */
+unsigned int has_hwp_pkg;		/* IA32_HWP_REQUEST_PKG */
 
 #define RAPL_PKG		(1 << 0)
 					/* 0x610 MSR_PKG_POWER_LIMIT */
@@ -145,6 +159,7 @@ struct thread_data {
 	unsigned long long extra_delta64;
 	unsigned long long extra_msr32;
 	unsigned long long extra_delta32;
+	unsigned int irq_count;
 	unsigned int smi_count;
 	unsigned int cpu_id;
 	unsigned int flags;
@@ -172,6 +187,8 @@ struct pkg_data {
 	unsigned long long pkg_any_core_c0;
 	unsigned long long pkg_any_gfxe_c0;
 	unsigned long long pkg_both_core_gfxe_c0;
+	unsigned long long gfx_rc6_ms;
+	unsigned int gfx_mhz;
 	unsigned int package_id;
 	unsigned int energy_pkg;	/* MSR_PKG_ENERGY_STATUS */
 	unsigned int energy_dram;	/* MSR_DRAM_ENERGY_STATUS */
@@ -212,6 +229,9 @@ struct topo_params {
 
 struct timeval tv_even, tv_odd, tv_delta;
 
+int *irq_column_2_cpu;	/* /proc/interrupts column numbers */
+int *irqs_per_cpu;		/* indexed by cpu_num */
+
 void setup_all_buffers(void);
 
 int cpu_is_not_present(int cpu)
@@ -262,23 +282,34 @@ int cpu_migrate(int cpu)
 	else
 		return 0;
 }
-
-int get_msr(int cpu, off_t offset, unsigned long long *msr)
+int get_msr_fd(int cpu)
 {
-	ssize_t retval;
 	char pathname[32];
 	int fd;
 
+	fd = fd_percpu[cpu];
+
+	if (fd)
+		return fd;
+
 	sprintf(pathname, "/dev/cpu/%d/msr", cpu);
 	fd = open(pathname, O_RDONLY);
 	if (fd < 0)
 		err(-1, "%s open failed, try chown or chmod +r /dev/cpu/*/msr, or run as root", pathname);
 
-	retval = pread(fd, msr, sizeof *msr, offset);
-	close(fd);
+	fd_percpu[cpu] = fd;
+
+	return fd;
+}
+
+int get_msr(int cpu, off_t offset, unsigned long long *msr)
+{
+	ssize_t retval;
+
+	retval = pread(get_msr_fd(cpu), msr, sizeof(*msr), offset);
 
 	if (retval != sizeof *msr)
-		err(-1, "%s offset 0x%llx read failed", pathname, (unsigned long long)offset);
+		err(-1, "msr %d offset 0x%llx read failed", cpu, (unsigned long long)offset);
 
 	return 0;
 }
@@ -286,8 +317,8 @@ int get_msr(int cpu, off_t offset, unsigned long long *msr)
 /*
  * Example Format w/ field column widths:
  *
- *  Package    Core     CPU Avg_MHz Bzy_MHz TSC_MHz     SMI   %Busy CPU_%c1 CPU_%c3 CPU_%c6 CPU_%c7 CoreTmp  PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 PkgWatt CorWatt GFXWatt
- * 123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678
+ *  Package    Core     CPU Avg_MHz Bzy_MHz TSC_MHz     IRQ   SMI   Busy% CPU_%c1 CPU_%c3 CPU_%c6 CPU_%c7 CoreTmp  PkgTmp  GFXMHz Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 PkgWatt CorWatt GFXWatt
+ * 12345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678123456781234567812345678
  */
 
 void print_header(void)
@@ -301,7 +332,7 @@ void print_header(void)
 	if (has_aperf)
 		outp += sprintf(outp, " Avg_MHz");
 	if (has_aperf)
-		outp += sprintf(outp, "   %%Busy");
+		outp += sprintf(outp, "   Busy%%");
 	if (has_aperf)
 		outp += sprintf(outp, " Bzy_MHz");
 	outp += sprintf(outp, " TSC_MHz");
@@ -318,6 +349,8 @@ void print_header(void)
 	if (!debug)
 		goto done;
 
+	if (do_irq)
+		outp += sprintf(outp, "     IRQ");
 	if (do_smi)
 		outp += sprintf(outp, "     SMI");
 
@@ -335,6 +368,12 @@ void print_header(void)
 	if (do_ptm)
 		outp += sprintf(outp, "  PkgTmp");
 
+	if (do_gfx_rc6_ms)
+		outp += sprintf(outp, " GFX%%rc6");
+
+	if (do_gfx_mhz)
+		outp += sprintf(outp, "  GFXMHz");
+
 	if (do_skl_residency) {
 		outp += sprintf(outp, " Totl%%C0");
 		outp += sprintf(outp, "  Any%%C0");
@@ -409,6 +448,8 @@ int dump_counters(struct thread_data *t, struct core_data *c,
 			extra_msr_offset32, t->extra_msr32);
 		outp += sprintf(outp, "msr0x%x: %016llX\n",
 			extra_msr_offset64, t->extra_msr64);
+		if (do_irq)
+			outp += sprintf(outp, "IRQ: %08X\n", t->irq_count);
 		if (do_smi)
 			outp += sprintf(outp, "SMI: %08X\n", t->smi_count);
 	}
@@ -504,7 +545,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
 		outp += sprintf(outp, "%8.0f",
 			1.0 / units * t->aperf / interval_float);
 
-	/* %Busy */
+	/* Busy% */
 	if (has_aperf) {
 		if (!skip_c0)
 			outp += sprintf(outp, "%8.2f", 100.0 * t->mperf/t->tsc/tsc_tweak);
@@ -542,6 +583,10 @@ int format_counters(struct thread_data *t, struct core_data *c,
 	if (!debug)
 		goto done;
 
+	/* IRQ */
+	if (do_irq)
+		outp += sprintf(outp, "%8d", t->irq_count);
+
 	/* SMI */
 	if (do_smi)
 		outp += sprintf(outp, "%8d", t->smi_count);
@@ -575,6 +620,14 @@ int format_counters(struct thread_data *t, struct core_data *c,
 	if (do_ptm)
 		outp += sprintf(outp, "%8d", p->pkg_temp_c);
 
+	/* GFXrc6 */
+	if (do_gfx_rc6_ms)
+		outp += sprintf(outp, "%8.2f", 100.0 * p->gfx_rc6_ms / 1000.0 / interval_float);
+
+	/* GFXMHz */
+	if (do_gfx_mhz)
+		outp += sprintf(outp, "%8d", p->gfx_mhz);
+
 	/* Totl%C0, Any%C0 GFX%C0 CPUGFX% */
 	if (do_skl_residency) {
 		outp += sprintf(outp, "%8.2f", 100.0 * p->pkg_wtd_core_c0/t->tsc);
@@ -645,15 +698,24 @@ done:
 	return 0;
 }
 
-void flush_stdout()
+void flush_output_stdout(void)
 {
-	fputs(output_buffer, stdout);
-	fflush(stdout);
+	FILE *filep;
+
+	if (outf == stderr)
+		filep = stdout;
+	else
+		filep = outf;
+
+	fputs(output_buffer, filep);
+	fflush(filep);
+
 	outp = output_buffer;
 }
-void flush_stderr()
+void flush_output_stderr(void)
 {
-	fputs(output_buffer, stderr);
+	fputs(output_buffer, outf);
+	fflush(outf);
 	outp = output_buffer;
 }
 void format_all_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
@@ -704,6 +766,9 @@ delta_package(struct pkg_data *new, struct pkg_data *old)
 	old->pc10 = new->pc10 - old->pc10;
 	old->pkg_temp_c = new->pkg_temp_c;
 
+	old->gfx_rc6_ms = new->gfx_rc6_ms - old->gfx_rc6_ms;
+	old->gfx_mhz = new->gfx_mhz;
+
 	DELTA_WRAP32(new->energy_pkg, old->energy_pkg);
 	DELTA_WRAP32(new->energy_cores, old->energy_cores);
 	DELTA_WRAP32(new->energy_gfx, old->energy_gfx);
@@ -745,9 +810,9 @@ delta_thread(struct thread_data *new, struct thread_data *old,
 		} else {
 
 			if (!aperf_mperf_unstable) {
-				fprintf(stderr, "%s: APERF or MPERF went backwards *\n", progname);
-				fprintf(stderr, "* Frequency results do not cover entire interval *\n");
-				fprintf(stderr, "* fix this by running Linux-2.6.30 or later *\n");
+				fprintf(outf, "%s: APERF or MPERF went backwards *\n", progname);
+				fprintf(outf, "* Frequency results do not cover entire interval *\n");
+				fprintf(outf, "* fix this by running Linux-2.6.30 or later *\n");
 
 				aperf_mperf_unstable = 1;
 			}
@@ -782,7 +847,8 @@ delta_thread(struct thread_data *new, struct thread_data *old,
 	}
 
 	if (old->mperf == 0) {
-		if (debug > 1) fprintf(stderr, "cpu%d MPERF 0!\n", old->cpu_id);
+		if (debug > 1)
+			fprintf(outf, "cpu%d MPERF 0!\n", old->cpu_id);
 		old->mperf = 1;	/* divide by 0 protection */
 	}
 
@@ -797,6 +863,9 @@ delta_thread(struct thread_data *new, struct thread_data *old,
 	old->extra_msr32 = new->extra_msr32;
 	old->extra_msr64 = new->extra_msr64;
 
+	if (do_irq)
+		old->irq_count = new->irq_count - old->irq_count;
+
 	if (do_smi)
 		old->smi_count = new->smi_count - old->smi_count;
 }
@@ -826,10 +895,12 @@ void clear_counters(struct thread_data *t, struct core_data *c, struct pkg_data
 	t->mperf = 0;
 	t->c1 = 0;
 
-	t->smi_count = 0;
 	t->extra_delta32 = 0;
 	t->extra_delta64 = 0;
 
+	t->irq_count = 0;
+	t->smi_count = 0;
+
 	/* tells format_counters to dump all fields from this set */
 	t->flags = CPU_IS_FIRST_THREAD_IN_CORE | CPU_IS_FIRST_CORE_IN_PACKAGE;
 
@@ -861,6 +932,9 @@ void clear_counters(struct thread_data *t, struct core_data *c, struct pkg_data
 	p->rapl_pkg_perf_status = 0;
 	p->rapl_dram_perf_status = 0;
 	p->pkg_temp_c = 0;
+
+	p->gfx_rc6_ms = 0;
+	p->gfx_mhz = 0;
 }
 int sum_counters(struct thread_data *t, struct core_data *c,
 	struct pkg_data *p)
@@ -873,6 +947,9 @@ int sum_counters(struct thread_data *t, struct core_data *c,
 	average.threads.extra_delta32 += t->extra_delta32;
 	average.threads.extra_delta64 += t->extra_delta64;
 
+	average.threads.irq_count += t->irq_count;
+	average.threads.smi_count += t->smi_count;
+
 	/* sum per-core values only for 1st thread in core */
 	if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE))
 		return 0;
@@ -910,6 +987,9 @@ int sum_counters(struct thread_data *t, struct core_data *c,
 	average.packages.energy_cores += p->energy_cores;
 	average.packages.energy_gfx += p->energy_gfx;
 
+	average.packages.gfx_rc6_ms = p->gfx_rc6_ms;
+	average.packages.gfx_mhz = p->gfx_mhz;
+
 	average.packages.pkg_temp_c = MAX(average.packages.pkg_temp_c, p->pkg_temp_c);
 
 	average.packages.rapl_pkg_perf_status += p->rapl_pkg_perf_status;
@@ -970,7 +1050,6 @@ static unsigned long long rdtsc(void)
 	return low | ((unsigned long long)high) << 32;
 }
 
-
 /*
  * get_counters(...)
  * migrate to cpu
@@ -980,23 +1059,74 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 {
 	int cpu = t->cpu_id;
 	unsigned long long msr;
+	int aperf_mperf_retry_count = 0;
 
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
+retry:
 	t->tsc = rdtsc();	/* we are running on local CPU of interest */
 
 	if (has_aperf) {
+		unsigned long long tsc_before, tsc_between, tsc_after, aperf_time, mperf_time;
+
+		/*
+		 * The TSC, APERF and MPERF must be read together for
+		 * APERF/MPERF and MPERF/TSC to give accurate results.
+		 *
+		 * Unfortunately, APERF and MPERF are read by
+		 * individual system call, so delays may occur
+		 * between them.  If the time to read them
+		 * varies by a large amount, we re-read them.
+		 */
+
+		/*
+		 * This initial dummy APERF read has been seen to
+		 * reduce jitter in the subsequent reads.
+		 */
+
+		if (get_msr(cpu, MSR_IA32_APERF, &t->aperf))
+			return -3;
+
+		t->tsc = rdtsc();	/* re-read close to APERF */
+
+		tsc_before = t->tsc;
+
 		if (get_msr(cpu, MSR_IA32_APERF, &t->aperf))
 			return -3;
+
+		tsc_between = rdtsc();
+
 		if (get_msr(cpu, MSR_IA32_MPERF, &t->mperf))
 			return -4;
+
+		tsc_after = rdtsc();
+
+		aperf_time = tsc_between - tsc_before;
+		mperf_time = tsc_after - tsc_between;
+
+		/*
+		 * If the system call latency to read APERF and MPERF
+		 * differ by more than 2x, then try again.
+		 */
+		if ((aperf_time > (2 * mperf_time)) || (mperf_time > (2 * aperf_time))) {
+			aperf_mperf_retry_count++;
+			if (aperf_mperf_retry_count < 5)
+				goto retry;
+			else
+				warnx("cpu%d jitter %lld %lld",
+					cpu, aperf_time, mperf_time);
+		}
+		aperf_mperf_retry_count = 0;
+
 		t->aperf = t->aperf * aperf_mperf_multiplier;
 		t->mperf = t->mperf * aperf_mperf_multiplier;
 	}
 
+	if (do_irq)
+		t->irq_count = irqs_per_cpu[cpu];
 	if (do_smi) {
 		if (get_msr(cpu, MSR_SMI_COUNT, &msr))
 			return -5;
@@ -1124,6 +1254,13 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 			return -17;
 		p->pkg_temp_c = tcc_activation_temp - ((msr >> 16) & 0x7F);
 	}
+
+	if (do_gfx_rc6_ms)
+		p->gfx_rc6_ms = gfx_cur_rc6_ms;
+
+	if (do_gfx_mhz)
+		p->gfx_mhz = gfx_cur_mhz;
+
 	return 0;
 }
 
@@ -1175,18 +1312,18 @@ dump_nhm_platform_info(void)
 
 	get_msr(base_cpu, MSR_PLATFORM_INFO, &msr);
 
-	fprintf(stderr, "cpu%d: MSR_PLATFORM_INFO: 0x%08llx\n", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_PLATFORM_INFO: 0x%08llx\n", base_cpu, msr);
 
 	ratio = (msr >> 40) & 0xFF;
-	fprintf(stderr, "%d * %.0f = %.0f MHz max efficiency frequency\n",
+	fprintf(outf, "%d * %.0f = %.0f MHz max efficiency frequency\n",
 		ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 8) & 0xFF;
-	fprintf(stderr, "%d * %.0f = %.0f MHz base frequency\n",
+	fprintf(outf, "%d * %.0f = %.0f MHz base frequency\n",
 		ratio, bclk, ratio * bclk);
 
 	get_msr(base_cpu, MSR_IA32_POWER_CTL, &msr);
-	fprintf(stderr, "cpu%d: MSR_IA32_POWER_CTL: 0x%08llx (C1E auto-promotion: %sabled)\n",
+	fprintf(outf, "cpu%d: MSR_IA32_POWER_CTL: 0x%08llx (C1E auto-promotion: %sabled)\n",
 		base_cpu, msr, msr & 0x2 ? "EN" : "DIS");
 
 	return;
@@ -1200,16 +1337,16 @@ dump_hsw_turbo_ratio_limits(void)
 
 	get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT2, &msr);
 
-	fprintf(stderr, "cpu%d: MSR_TURBO_RATIO_LIMIT2: 0x%08llx\n", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_TURBO_RATIO_LIMIT2: 0x%08llx\n", base_cpu, msr);
 
 	ratio = (msr >> 8) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 18 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 18 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 0) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 17 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 17 active cores\n",
 			ratio, bclk, ratio * bclk);
 	return;
 }
@@ -1222,46 +1359,46 @@ dump_ivt_turbo_ratio_limits(void)
 
 	get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT1, &msr);
 
-	fprintf(stderr, "cpu%d: MSR_TURBO_RATIO_LIMIT1: 0x%08llx\n", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_TURBO_RATIO_LIMIT1: 0x%08llx\n", base_cpu, msr);
 
 	ratio = (msr >> 56) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 16 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 16 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 48) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 15 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 15 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 40) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 14 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 14 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 32) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 13 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 13 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 24) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 12 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 12 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 16) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 11 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 11 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 8) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 10 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 10 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 0) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 9 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 9 active cores\n",
 			ratio, bclk, ratio * bclk);
 	return;
 }
@@ -1274,46 +1411,46 @@ dump_nhm_turbo_ratio_limits(void)
 
 	get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT, &msr);
 
-	fprintf(stderr, "cpu%d: MSR_TURBO_RATIO_LIMIT: 0x%08llx\n", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_TURBO_RATIO_LIMIT: 0x%08llx\n", base_cpu, msr);
 
 	ratio = (msr >> 56) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 8 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 8 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 48) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 7 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 7 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 40) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 6 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 6 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 32) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 5 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 5 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 24) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 4 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 4 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 16) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 3 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 3 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 8) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 2 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 2 active cores\n",
 			ratio, bclk, ratio * bclk);
 
 	ratio = (msr >> 0) & 0xFF;
 	if (ratio)
-		fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 1 active cores\n",
+		fprintf(outf, "%d * %.0f = %.0f MHz max turbo 1 active cores\n",
 			ratio, bclk, ratio * bclk);
 	return;
 }
@@ -1321,21 +1458,23 @@ dump_nhm_turbo_ratio_limits(void)
 static void
 dump_knl_turbo_ratio_limits(void)
 {
-	int cores;
-	unsigned int ratio;
+	const unsigned int buckets_no = 7;
+
 	unsigned long long msr;
-	int delta_cores;
-	int delta_ratio;
-	int i;
+	int delta_cores, delta_ratio;
+	int i, b_nr;
+	unsigned int cores[buckets_no];
+	unsigned int ratio[buckets_no];
 
 	get_msr(base_cpu, MSR_NHM_TURBO_RATIO_LIMIT, &msr);
 
-	fprintf(stderr, "cpu%d: MSR_NHM_TURBO_RATIO_LIMIT: 0x%08llx\n",
+	fprintf(outf, "cpu%d: MSR_TURBO_RATIO_LIMIT: 0x%08llx\n",
 		base_cpu, msr);
 
 	/**
 	 * Turbo encoding in KNL is as follows:
-	 * [7:0] -- Base value of number of active cores of bucket 1.
+	 * [0] -- Reserved
+	 * [7:1] -- Base value of number of active cores of bucket 1.
 	 * [15:8] -- Base value of freq ratio of bucket 1.
 	 * [20:16] -- +ve delta of number of active cores of bucket 2.
 	 * i.e. active cores of bucket 2 =
@@ -1354,29 +1493,25 @@ dump_knl_turbo_ratio_limits(void)
 	 * [60:56]-- +ve delta of number of active cores of bucket 7.
 	 * [63:61]-- -ve delta of freq ratio of bucket 7.
 	 */
-	cores = msr & 0xFF;
-	ratio = (msr >> 8) && 0xFF;
-	if (ratio > 0)
-		fprintf(stderr,
-			"%d * %.0f = %.0f MHz max turbo %d active cores\n",
-			ratio, bclk, ratio * bclk, cores);
-
-	for (i = 16; i < 64; i = i + 8) {
+
+	b_nr = 0;
+	cores[b_nr] = (msr & 0xFF) >> 1;
+	ratio[b_nr] = (msr >> 8) & 0xFF;
+
+	for (i = 16; i < 64; i += 8) {
 		delta_cores = (msr >> i) & 0x1F;
-		delta_ratio = (msr >> (i + 5)) && 0x7;
-		if (!delta_cores || !delta_ratio)
-			return;
-		cores = cores + delta_cores;
-		ratio = ratio - delta_ratio;
-
-		/** -ve ratios will make successive ratio calculations
-		 * negative. Hence return instead of carrying on.
-		 */
-		if (ratio > 0)
-			fprintf(stderr,
-				"%d * %.0f = %.0f MHz max turbo %d active cores\n",
-				ratio, bclk, ratio * bclk, cores);
+		delta_ratio = (msr >> (i + 5)) & 0x7;
+
+		cores[b_nr + 1] = cores[b_nr] + delta_cores;
+		ratio[b_nr + 1] = ratio[b_nr] - delta_ratio;
+		b_nr++;
 	}
+
+	for (i = buckets_no - 1; i >= 0; i--)
+		if (i > 0 ? ratio[i] != ratio[i - 1] : 1)
+			fprintf(outf,
+				"%d * %.0f = %.0f MHz max turbo %d active cores\n",
+				ratio[i], bclk, ratio[i] * bclk, cores[i]);
 }
 
 static void
@@ -1389,15 +1524,15 @@ dump_nhm_cst_cfg(void)
 #define SNB_C1_AUTO_UNDEMOTE              (1UL << 27)
 #define SNB_C3_AUTO_UNDEMOTE              (1UL << 28)
 
-	fprintf(stderr, "cpu%d: MSR_NHM_SNB_PKG_CST_CFG_CTL: 0x%08llx", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_NHM_SNB_PKG_CST_CFG_CTL: 0x%08llx", base_cpu, msr);
 
-	fprintf(stderr, " (%s%s%s%s%slocked: pkg-cstate-limit=%d: %s)\n",
+	fprintf(outf, " (%s%s%s%s%slocked: pkg-cstate-limit=%d: %s)\n",
 		(msr & SNB_C3_AUTO_UNDEMOTE) ? "UNdemote-C3, " : "",
 		(msr & SNB_C1_AUTO_UNDEMOTE) ? "UNdemote-C1, " : "",
 		(msr & NHM_C3_AUTO_DEMOTE) ? "demote-C3, " : "",
 		(msr & NHM_C1_AUTO_DEMOTE) ? "demote-C1, " : "",
 		(msr & (1 << 15)) ? "" : "UN",
-		(unsigned int)msr & 7,
+		(unsigned int)msr & 0xF,
 		pkg_cstate_limit_strings[pkg_cstate_limit]);
 	return;
 }
@@ -1408,48 +1543,59 @@ dump_config_tdp(void)
 	unsigned long long msr;
 
 	get_msr(base_cpu, MSR_CONFIG_TDP_NOMINAL, &msr);
-	fprintf(stderr, "cpu%d: MSR_CONFIG_TDP_NOMINAL: 0x%08llx", base_cpu, msr);
-	fprintf(stderr, " (base_ratio=%d)\n", (unsigned int)msr & 0xEF);
+	fprintf(outf, "cpu%d: MSR_CONFIG_TDP_NOMINAL: 0x%08llx", base_cpu, msr);
+	fprintf(outf, " (base_ratio=%d)\n", (unsigned int)msr & 0xFF);
 
 	get_msr(base_cpu, MSR_CONFIG_TDP_LEVEL_1, &msr);
-	fprintf(stderr, "cpu%d: MSR_CONFIG_TDP_LEVEL_1: 0x%08llx (", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_CONFIG_TDP_LEVEL_1: 0x%08llx (", base_cpu, msr);
 	if (msr) {
-		fprintf(stderr, "PKG_MIN_PWR_LVL1=%d ", (unsigned int)(msr >> 48) & 0xEFFF);
-		fprintf(stderr, "PKG_MAX_PWR_LVL1=%d ", (unsigned int)(msr >> 32) & 0xEFFF);
-		fprintf(stderr, "LVL1_RATIO=%d ", (unsigned int)(msr >> 16) & 0xEF);
-		fprintf(stderr, "PKG_TDP_LVL1=%d", (unsigned int)(msr) & 0xEFFF);
+		fprintf(outf, "PKG_MIN_PWR_LVL1=%d ", (unsigned int)(msr >> 48) & 0x7FFF);
+		fprintf(outf, "PKG_MAX_PWR_LVL1=%d ", (unsigned int)(msr >> 32) & 0x7FFF);
+		fprintf(outf, "LVL1_RATIO=%d ", (unsigned int)(msr >> 16) & 0xFF);
+		fprintf(outf, "PKG_TDP_LVL1=%d", (unsigned int)(msr) & 0x7FFF);
 	}
-	fprintf(stderr, ")\n");
+	fprintf(outf, ")\n");
 
 	get_msr(base_cpu, MSR_CONFIG_TDP_LEVEL_2, &msr);
-	fprintf(stderr, "cpu%d: MSR_CONFIG_TDP_LEVEL_2: 0x%08llx (", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_CONFIG_TDP_LEVEL_2: 0x%08llx (", base_cpu, msr);
 	if (msr) {
-		fprintf(stderr, "PKG_MIN_PWR_LVL2=%d ", (unsigned int)(msr >> 48) & 0xEFFF);
-		fprintf(stderr, "PKG_MAX_PWR_LVL2=%d ", (unsigned int)(msr >> 32) & 0xEFFF);
-		fprintf(stderr, "LVL2_RATIO=%d ", (unsigned int)(msr >> 16) & 0xEF);
-		fprintf(stderr, "PKG_TDP_LVL2=%d", (unsigned int)(msr) & 0xEFFF);
+		fprintf(outf, "PKG_MIN_PWR_LVL2=%d ", (unsigned int)(msr >> 48) & 0x7FFF);
+		fprintf(outf, "PKG_MAX_PWR_LVL2=%d ", (unsigned int)(msr >> 32) & 0x7FFF);
+		fprintf(outf, "LVL2_RATIO=%d ", (unsigned int)(msr >> 16) & 0xFF);
+		fprintf(outf, "PKG_TDP_LVL2=%d", (unsigned int)(msr) & 0x7FFF);
 	}
-	fprintf(stderr, ")\n");
+	fprintf(outf, ")\n");
 
 	get_msr(base_cpu, MSR_CONFIG_TDP_CONTROL, &msr);
-	fprintf(stderr, "cpu%d: MSR_CONFIG_TDP_CONTROL: 0x%08llx (", base_cpu, msr);
+	fprintf(outf, "cpu%d: MSR_CONFIG_TDP_CONTROL: 0x%08llx (", base_cpu, msr);
 	if ((msr) & 0x3)
-		fprintf(stderr, "TDP_LEVEL=%d ", (unsigned int)(msr) & 0x3);
-	fprintf(stderr, " lock=%d", (unsigned int)(msr >> 31) & 1);
-	fprintf(stderr, ")\n");
-	
+		fprintf(outf, "TDP_LEVEL=%d ", (unsigned int)(msr) & 0x3);
+	fprintf(outf, " lock=%d", (unsigned int)(msr >> 31) & 1);
+	fprintf(outf, ")\n");
+
 	get_msr(base_cpu, MSR_TURBO_ACTIVATION_RATIO, &msr);
-	fprintf(stderr, "cpu%d: MSR_TURBO_ACTIVATION_RATIO: 0x%08llx (", base_cpu, msr);
-	fprintf(stderr, "MAX_NON_TURBO_RATIO=%d", (unsigned int)(msr) & 0x7F);
-	fprintf(stderr, " lock=%d", (unsigned int)(msr >> 31) & 1);
-	fprintf(stderr, ")\n");
+	fprintf(outf, "cpu%d: MSR_TURBO_ACTIVATION_RATIO: 0x%08llx (", base_cpu, msr);
+	fprintf(outf, "MAX_NON_TURBO_RATIO=%d", (unsigned int)(msr) & 0xFF);
+	fprintf(outf, " lock=%d", (unsigned int)(msr >> 31) & 1);
+	fprintf(outf, ")\n");
+}
+void free_fd_percpu(void)
+{
+	int i;
+
+	for (i = 0; i < topo.max_cpu_num; ++i) {
+		if (fd_percpu[i] != 0)
+			close(fd_percpu[i]);
+	}
+
+	free(fd_percpu);
 }
 
 void free_all_buffers(void)
 {
 	CPU_FREE(cpu_present_set);
 	cpu_present_set = NULL;
-	cpu_present_set = 0;
+	cpu_present_setsize = 0;
 
 	CPU_FREE(cpu_affinity_set);
 	cpu_affinity_set = NULL;
@@ -1474,6 +1620,11 @@ void free_all_buffers(void)
 	free(output_buffer);
 	output_buffer = NULL;
 	outp = NULL;
+
+	free_fd_percpu();
+
+	free(irq_column_2_cpu);
+	free(irqs_per_cpu);
 }
 
 /*
@@ -1481,7 +1632,7 @@ void free_all_buffers(void)
  */
 FILE *fopen_or_die(const char *path, const char *mode)
 {
-	FILE *filep = fopen(path, "r");
+	FILE *filep = fopen(path, mode);
 	if (!filep)
 		err(1, "%s: open failed", path);
 	return filep;
@@ -1696,6 +1847,136 @@ int mark_cpu_present(int cpu)
 	return 0;
 }
 
+/*
+ * snapshot_proc_interrupts()
+ *
+ * read and record summary of /proc/interrupts
+ *
+ * return 1 if config change requires a restart, else return 0
+ */
+int snapshot_proc_interrupts(void)
+{
+	static FILE *fp;
+	int column, retval;
+
+	if (fp == NULL)
+		fp = fopen_or_die("/proc/interrupts", "r");
+	else
+		rewind(fp);
+
+	/* read 1st line of /proc/interrupts to get cpu* name for each column */
+	for (column = 0; column < topo.num_cpus; ++column) {
+		int cpu_number;
+
+		retval = fscanf(fp, " CPU%d", &cpu_number);
+		if (retval != 1)
+			break;
+
+		if (cpu_number > topo.max_cpu_num) {
+			warn("/proc/interrupts: cpu%d: > %d", cpu_number, topo.max_cpu_num);
+			return 1;
+		}
+
+		irq_column_2_cpu[column] = cpu_number;
+		irqs_per_cpu[cpu_number] = 0;
+	}
+
+	/* read /proc/interrupt count lines and sum up irqs per cpu */
+	while (1) {
+		int column;
+		char buf[64];
+
+		retval = fscanf(fp, " %s:", buf);	/* flush irq# "N:" */
+		if (retval != 1)
+			break;
+
+		/* read the count per cpu */
+		for (column = 0; column < topo.num_cpus; ++column) {
+
+			int cpu_number, irq_count;
+
+			retval = fscanf(fp, " %d", &irq_count);
+			if (retval != 1)
+				break;
+
+			cpu_number = irq_column_2_cpu[column];
+			irqs_per_cpu[cpu_number] += irq_count;
+
+		}
+
+		while (getc(fp) != '\n')
+			;	/* flush interrupt description */
+
+	}
+	return 0;
+}
+/*
+ * snapshot_gfx_rc6_ms()
+ *
+ * record snapshot of
+ * /sys/class/drm/card0/power/rc6_residency_ms
+ *
+ * return 1 if config change requires a restart, else return 0
+ */
+int snapshot_gfx_rc6_ms(void)
+{
+	FILE *fp;
+	int retval;
+
+	fp = fopen_or_die("/sys/class/drm/card0/power/rc6_residency_ms", "r");
+
+	retval = fscanf(fp, "%lld", &gfx_cur_rc6_ms);
+	if (retval != 1)
+		err(1, "GFX rc6");
+
+	fclose(fp);
+
+	return 0;
+}
+/*
+ * snapshot_gfx_mhz()
+ *
+ * record snapshot of
+ * /sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz
+ *
+ * return 1 if config change requires a restart, else return 0
+ */
+int snapshot_gfx_mhz(void)
+{
+	static FILE *fp;
+	int retval;
+
+	if (fp == NULL)
+		fp = fopen_or_die("/sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz", "r");
+	else
+		rewind(fp);
+
+	retval = fscanf(fp, "%d", &gfx_cur_mhz);
+	if (retval != 1)
+		err(1, "GFX MHz");
+
+	return 0;
+}
+
+/*
+ * snapshot /proc and /sys files
+ *
+ * return 1 if configuration restart needed, else return 0
+ */
+int snapshot_proc_sysfs_files(void)
+{
+	if (snapshot_proc_interrupts())
+		return 1;
+
+	if (do_gfx_rc6_ms)
+		snapshot_gfx_rc6_ms();
+
+	if (do_gfx_mhz)
+		snapshot_gfx_mhz();
+
+	return 0;
+}
+
 void turbostat_loop()
 {
 	int retval;
@@ -1704,6 +1985,7 @@ void turbostat_loop()
 restart:
 	restarted++;
 
+	snapshot_proc_sysfs_files();
 	retval = for_all_cpus(get_counters, EVEN_COUNTERS);
 	if (retval < -1) {
 		exit(retval);
@@ -1722,7 +2004,9 @@ restart:
 			re_initialize();
 			goto restart;
 		}
-		sleep(interval_sec);
+		nanosleep(&interval_ts, NULL);
+		if (snapshot_proc_sysfs_files())
+			goto restart;
 		retval = for_all_cpus(get_counters, ODD_COUNTERS);
 		if (retval < -1) {
 			exit(retval);
@@ -1735,8 +2019,10 @@ restart:
 		for_all_cpus_2(delta_cpu, ODD_COUNTERS, EVEN_COUNTERS);
 		compute_average(EVEN_COUNTERS);
 		format_all_counters(EVEN_COUNTERS);
-		flush_stdout();
-		sleep(interval_sec);
+		flush_output_stdout();
+		nanosleep(&interval_ts, NULL);
+		if (snapshot_proc_sysfs_files())
+			goto restart;
 		retval = for_all_cpus(get_counters, EVEN_COUNTERS);
 		if (retval < -1) {
 			exit(retval);
@@ -1749,7 +2035,7 @@ restart:
 		for_all_cpus_2(delta_cpu, EVEN_COUNTERS, ODD_COUNTERS);
 		compute_average(ODD_COUNTERS);
 		format_all_counters(ODD_COUNTERS);
-		flush_stdout();
+		flush_output_stdout();
 	}
 }
 
@@ -1889,6 +2175,7 @@ int has_nhm_turbo_ratio_limit(unsigned int family, unsigned int model)
 	/* Nehalem compatible, but do not include turbo-ratio limit support */
 	case 0x2E:	/* Nehalem-EX Xeon - Beckton */
 	case 0x2F:	/* Westmere-EX Xeon - Eagleton */
+	case 0x57:	/* PHI - Knights Landing (different MSR definition) */
 		return 0;
 	default:
 		return 1;
@@ -2016,7 +2303,7 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 		return 0;
 
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
@@ -2037,7 +2324,98 @@ int print_epb(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 		epb_string = "custom";
 		break;
 	}
-	fprintf(stderr, "cpu%d: MSR_IA32_ENERGY_PERF_BIAS: 0x%08llx (%s)\n", cpu, msr, epb_string);
+	fprintf(outf, "cpu%d: MSR_IA32_ENERGY_PERF_BIAS: 0x%08llx (%s)\n", cpu, msr, epb_string);
+
+	return 0;
+}
+/*
+ * print_hwp()
+ * Decode the MSR_HWP_CAPABILITIES
+ */
+int print_hwp(struct thread_data *t, struct core_data *c, struct pkg_data *p)
+{
+	unsigned long long msr;
+	int cpu;
+
+	if (!has_hwp)
+		return 0;
+
+	cpu = t->cpu_id;
+
+	/* MSR_HWP_CAPABILITIES is per-package */
+	if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE) || !(t->flags & CPU_IS_FIRST_CORE_IN_PACKAGE))
+		return 0;
+
+	if (cpu_migrate(cpu)) {
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
+		return -1;
+	}
+
+	if (get_msr(cpu, MSR_PM_ENABLE, &msr))
+		return 0;
+
+	fprintf(outf, "cpu%d: MSR_PM_ENABLE: 0x%08llx (%sHWP)\n",
+		cpu, msr, (msr & (1 << 0)) ? "" : "No-");
+
+	/* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */
+	if ((msr & (1 << 0)) == 0)
+		return 0;
+
+	if (get_msr(cpu, MSR_HWP_CAPABILITIES, &msr))
+		return 0;
+
+	fprintf(outf, "cpu%d: MSR_HWP_CAPABILITIES: 0x%08llx "
+			"(high 0x%x guar 0x%x eff 0x%x low 0x%x)\n",
+			cpu, msr,
+			(unsigned int)HWP_HIGHEST_PERF(msr),
+			(unsigned int)HWP_GUARANTEED_PERF(msr),
+			(unsigned int)HWP_MOSTEFFICIENT_PERF(msr),
+			(unsigned int)HWP_LOWEST_PERF(msr));
+
+	if (get_msr(cpu, MSR_HWP_REQUEST, &msr))
+		return 0;
+
+	fprintf(outf, "cpu%d: MSR_HWP_REQUEST: 0x%08llx "
+			"(min 0x%x max 0x%x des 0x%x epp 0x%x window 0x%x pkg 0x%x)\n",
+			cpu, msr,
+			(unsigned int)(((msr) >> 0) & 0xff),
+			(unsigned int)(((msr) >> 8) & 0xff),
+			(unsigned int)(((msr) >> 16) & 0xff),
+			(unsigned int)(((msr) >> 24) & 0xff),
+			(unsigned int)(((msr) >> 32) & 0xff3),
+			(unsigned int)(((msr) >> 42) & 0x1));
+
+	if (has_hwp_pkg) {
+		if (get_msr(cpu, MSR_HWP_REQUEST_PKG, &msr))
+			return 0;
+
+		fprintf(outf, "cpu%d: MSR_HWP_REQUEST_PKG: 0x%08llx "
+			"(min 0x%x max 0x%x des 0x%x epp 0x%x window 0x%x)\n",
+			cpu, msr,
+			(unsigned int)(((msr) >> 0) & 0xff),
+			(unsigned int)(((msr) >> 8) & 0xff),
+			(unsigned int)(((msr) >> 16) & 0xff),
+			(unsigned int)(((msr) >> 24) & 0xff),
+			(unsigned int)(((msr) >> 32) & 0xff3));
+	}
+	if (has_hwp_notify) {
+		if (get_msr(cpu, MSR_HWP_INTERRUPT, &msr))
+			return 0;
+
+		fprintf(outf, "cpu%d: MSR_HWP_INTERRUPT: 0x%08llx "
+			"(%s_Guaranteed_Perf_Change, %s_Excursion_Min)\n",
+			cpu, msr,
+			((msr) & 0x1) ? "EN" : "Dis",
+			((msr) & 0x2) ? "EN" : "Dis");
+	}
+	if (get_msr(cpu, MSR_HWP_STATUS, &msr))
+		return 0;
+
+	fprintf(outf, "cpu%d: MSR_HWP_STATUS: 0x%08llx "
+			"(%sGuaranteed_Perf_Change, %sExcursion_Min)\n",
+			cpu, msr,
+			((msr) & 0x1) ? "" : "No-",
+			((msr) & 0x2) ? "" : "No-");
 
 	return 0;
 }
@@ -2057,14 +2435,14 @@ int print_perf_limit(struct thread_data *t, struct core_data *c, struct pkg_data
 		return 0;
 
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
 	if (do_core_perf_limit_reasons) {
 		get_msr(cpu, MSR_CORE_PERF_LIMIT_REASONS, &msr);
-		fprintf(stderr, "cpu%d: MSR_CORE_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
-		fprintf(stderr, " (Active: %s%s%s%s%s%s%s%s%s%s%s%s%s%s)",
+		fprintf(outf, "cpu%d: MSR_CORE_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
+		fprintf(outf, " (Active: %s%s%s%s%s%s%s%s%s%s%s%s%s%s)",
 			(msr & 1 << 15) ? "bit15, " : "",
 			(msr & 1 << 14) ? "bit14, " : "",
 			(msr & 1 << 13) ? "Transitions, " : "",
@@ -2079,7 +2457,7 @@ int print_perf_limit(struct thread_data *t, struct core_data *c, struct pkg_data
 			(msr & 1 << 2) ? "bit2, " : "",
 			(msr & 1 << 1) ? "ThermStatus, " : "",
 			(msr & 1 << 0) ? "PROCHOT, " : "");
-		fprintf(stderr, " (Logged: %s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
+		fprintf(outf, " (Logged: %s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
 			(msr & 1 << 31) ? "bit31, " : "",
 			(msr & 1 << 30) ? "bit30, " : "",
 			(msr & 1 << 29) ? "Transitions, " : "",
@@ -2098,8 +2476,8 @@ int print_perf_limit(struct thread_data *t, struct core_data *c, struct pkg_data
 	}
 	if (do_gfx_perf_limit_reasons) {
 		get_msr(cpu, MSR_GFX_PERF_LIMIT_REASONS, &msr);
-		fprintf(stderr, "cpu%d: MSR_GFX_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
-		fprintf(stderr, " (Active: %s%s%s%s%s%s%s%s)",
+		fprintf(outf, "cpu%d: MSR_GFX_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
+		fprintf(outf, " (Active: %s%s%s%s%s%s%s%s)",
 			(msr & 1 << 0) ? "PROCHOT, " : "",
 			(msr & 1 << 1) ? "ThermStatus, " : "",
 			(msr & 1 << 4) ? "Graphics, " : "",
@@ -2108,7 +2486,7 @@ int print_perf_limit(struct thread_data *t, struct core_data *c, struct pkg_data
 			(msr & 1 << 9) ? "GFXPwr, " : "",
 			(msr & 1 << 10) ? "PkgPwrL1, " : "",
 			(msr & 1 << 11) ? "PkgPwrL2, " : "");
-		fprintf(stderr, " (Logged: %s%s%s%s%s%s%s%s)\n",
+		fprintf(outf, " (Logged: %s%s%s%s%s%s%s%s)\n",
 			(msr & 1 << 16) ? "PROCHOT, " : "",
 			(msr & 1 << 17) ? "ThermStatus, " : "",
 			(msr & 1 << 20) ? "Graphics, " : "",
@@ -2120,15 +2498,15 @@ int print_perf_limit(struct thread_data *t, struct core_data *c, struct pkg_data
 	}
 	if (do_ring_perf_limit_reasons) {
 		get_msr(cpu, MSR_RING_PERF_LIMIT_REASONS, &msr);
-		fprintf(stderr, "cpu%d: MSR_RING_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
-		fprintf(stderr, " (Active: %s%s%s%s%s%s)",
+		fprintf(outf, "cpu%d: MSR_RING_PERF_LIMIT_REASONS, 0x%08llx", cpu, msr);
+		fprintf(outf, " (Active: %s%s%s%s%s%s)",
 			(msr & 1 << 0) ? "PROCHOT, " : "",
 			(msr & 1 << 1) ? "ThermStatus, " : "",
 			(msr & 1 << 6) ? "VR-Therm, " : "",
 			(msr & 1 << 8) ? "Amps, " : "",
 			(msr & 1 << 10) ? "PkgPwrL1, " : "",
 			(msr & 1 << 11) ? "PkgPwrL2, " : "");
-		fprintf(stderr, " (Logged: %s%s%s%s%s%s)\n",
+		fprintf(outf, " (Logged: %s%s%s%s%s%s)\n",
 			(msr & 1 << 16) ? "PROCHOT, " : "",
 			(msr & 1 << 17) ? "ThermStatus, " : "",
 			(msr & 1 << 22) ? "VR-Therm, " : "",
@@ -2251,7 +2629,7 @@ void rapl_probe(unsigned int family, unsigned int model)
 
 	rapl_joule_counter_range = 0xFFFFFFFF * rapl_energy_units / tdp;
 	if (debug)
-		fprintf(stderr, "RAPL: %.0f sec. Joule Counter Range, at %.0f Watts\n", rapl_joule_counter_range, tdp);
+		fprintf(outf, "RAPL: %.0f sec. Joule Counter Range, at %.0f Watts\n", rapl_joule_counter_range, tdp);
 
 	return;
 }
@@ -2293,7 +2671,7 @@ int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p
 		return 0;
 
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
@@ -2302,7 +2680,7 @@ int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p
 			return 0;
 
 		dts = (msr >> 16) & 0x7F;
-		fprintf(stderr, "cpu%d: MSR_IA32_PACKAGE_THERM_STATUS: 0x%08llx (%d C)\n",
+		fprintf(outf, "cpu%d: MSR_IA32_PACKAGE_THERM_STATUS: 0x%08llx (%d C)\n",
 			cpu, msr, tcc_activation_temp - dts);
 
 #ifdef	THERM_DEBUG
@@ -2311,7 +2689,7 @@ int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p
 
 		dts = (msr >> 16) & 0x7F;
 		dts2 = (msr >> 8) & 0x7F;
-		fprintf(stderr, "cpu%d: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x%08llx (%d C, %d C)\n",
+		fprintf(outf, "cpu%d: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x%08llx (%d C, %d C)\n",
 			cpu, msr, tcc_activation_temp - dts, tcc_activation_temp - dts2);
 #endif
 	}
@@ -2325,7 +2703,7 @@ int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p
 
 		dts = (msr >> 16) & 0x7F;
 		resolution = (msr >> 27) & 0xF;
-		fprintf(stderr, "cpu%d: MSR_IA32_THERM_STATUS: 0x%08llx (%d C +/- %d)\n",
+		fprintf(outf, "cpu%d: MSR_IA32_THERM_STATUS: 0x%08llx (%d C +/- %d)\n",
 			cpu, msr, tcc_activation_temp - dts, resolution);
 
 #ifdef THERM_DEBUG
@@ -2334,17 +2712,17 @@ int print_thermal(struct thread_data *t, struct core_data *c, struct pkg_data *p
 
 		dts = (msr >> 16) & 0x7F;
 		dts2 = (msr >> 8) & 0x7F;
-		fprintf(stderr, "cpu%d: MSR_IA32_THERM_INTERRUPT: 0x%08llx (%d C, %d C)\n",
+		fprintf(outf, "cpu%d: MSR_IA32_THERM_INTERRUPT: 0x%08llx (%d C, %d C)\n",
 			cpu, msr, tcc_activation_temp - dts, tcc_activation_temp - dts2);
 #endif
 	}
 
 	return 0;
 }
-	
+
 void print_power_limit_msr(int cpu, unsigned long long msr, char *label)
 {
-	fprintf(stderr, "cpu%d: %s: %sabled (%f Watts, %f sec, clamp %sabled)\n",
+	fprintf(outf, "cpu%d: %s: %sabled (%f Watts, %f sec, clamp %sabled)\n",
 		cpu, label,
 		((msr >> 15) & 1) ? "EN" : "DIS",
 		((msr >> 0) & 0x7FFF) * rapl_power_units,
@@ -2368,7 +2746,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 
 	cpu = t->cpu_id;
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
@@ -2376,7 +2754,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 		return -1;
 
 	if (debug) {
-		fprintf(stderr, "cpu%d: MSR_RAPL_POWER_UNIT: 0x%08llx "
+		fprintf(outf, "cpu%d: MSR_RAPL_POWER_UNIT: 0x%08llx "
 			"(%f Watts, %f Joules, %f sec.)\n", cpu, msr,
 			rapl_power_units, rapl_energy_units, rapl_time_units);
 	}
@@ -2386,7 +2764,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
                 	return -5;
 
 
-		fprintf(stderr, "cpu%d: MSR_PKG_POWER_INFO: 0x%08llx (%.0f W TDP, RAPL %.0f - %.0f W, %f sec.)\n",
+		fprintf(outf, "cpu%d: MSR_PKG_POWER_INFO: 0x%08llx (%.0f W TDP, RAPL %.0f - %.0f W, %f sec.)\n",
 			cpu, msr,
 			((msr >>  0) & RAPL_POWER_GRANULARITY) * rapl_power_units,
 			((msr >> 16) & RAPL_POWER_GRANULARITY) * rapl_power_units,
@@ -2399,11 +2777,11 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 		if (get_msr(cpu, MSR_PKG_POWER_LIMIT, &msr))
 			return -9;
 
-		fprintf(stderr, "cpu%d: MSR_PKG_POWER_LIMIT: 0x%08llx (%slocked)\n",
+		fprintf(outf, "cpu%d: MSR_PKG_POWER_LIMIT: 0x%08llx (%slocked)\n",
 			cpu, msr, (msr >> 63) & 1 ? "": "UN");
 
 		print_power_limit_msr(cpu, msr, "PKG Limit #1");
-		fprintf(stderr, "cpu%d: PKG Limit #2: %sabled (%f Watts, %f* sec, clamp %sabled)\n",
+		fprintf(outf, "cpu%d: PKG Limit #2: %sabled (%f Watts, %f* sec, clamp %sabled)\n",
 			cpu,
 			((msr >> 47) & 1) ? "EN" : "DIS",
 			((msr >> 32) & 0x7FFF) * rapl_power_units,
@@ -2415,7 +2793,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 		if (get_msr(cpu, MSR_DRAM_POWER_INFO, &msr))
                 	return -6;
 
-		fprintf(stderr, "cpu%d: MSR_DRAM_POWER_INFO,: 0x%08llx (%.0f W TDP, RAPL %.0f - %.0f W, %f sec.)\n",
+		fprintf(outf, "cpu%d: MSR_DRAM_POWER_INFO,: 0x%08llx (%.0f W TDP, RAPL %.0f - %.0f W, %f sec.)\n",
 			cpu, msr,
 			((msr >>  0) & RAPL_POWER_GRANULARITY) * rapl_power_units,
 			((msr >> 16) & RAPL_POWER_GRANULARITY) * rapl_power_units,
@@ -2425,7 +2803,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 	if (do_rapl & RAPL_DRAM) {
 		if (get_msr(cpu, MSR_DRAM_POWER_LIMIT, &msr))
 			return -9;
-		fprintf(stderr, "cpu%d: MSR_DRAM_POWER_LIMIT: 0x%08llx (%slocked)\n",
+		fprintf(outf, "cpu%d: MSR_DRAM_POWER_LIMIT: 0x%08llx (%slocked)\n",
 				cpu, msr, (msr >> 31) & 1 ? "": "UN");
 
 		print_power_limit_msr(cpu, msr, "DRAM Limit");
@@ -2435,7 +2813,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 			if (get_msr(cpu, MSR_PP0_POLICY, &msr))
 				return -7;
 
-			fprintf(stderr, "cpu%d: MSR_PP0_POLICY: %lld\n", cpu, msr & 0xF);
+			fprintf(outf, "cpu%d: MSR_PP0_POLICY: %lld\n", cpu, msr & 0xF);
 		}
 	}
 	if (do_rapl & RAPL_CORES) {
@@ -2443,7 +2821,7 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 
 			if (get_msr(cpu, MSR_PP0_POWER_LIMIT, &msr))
 				return -9;
-			fprintf(stderr, "cpu%d: MSR_PP0_POWER_LIMIT: 0x%08llx (%slocked)\n",
+			fprintf(outf, "cpu%d: MSR_PP0_POWER_LIMIT: 0x%08llx (%slocked)\n",
 					cpu, msr, (msr >> 31) & 1 ? "": "UN");
 			print_power_limit_msr(cpu, msr, "Cores Limit");
 		}
@@ -2453,11 +2831,11 @@ int print_rapl(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 			if (get_msr(cpu, MSR_PP1_POLICY, &msr))
 				return -8;
 
-			fprintf(stderr, "cpu%d: MSR_PP1_POLICY: %lld\n", cpu, msr & 0xF);
+			fprintf(outf, "cpu%d: MSR_PP1_POLICY: %lld\n", cpu, msr & 0xF);
 
 			if (get_msr(cpu, MSR_PP1_POWER_LIMIT, &msr))
 				return -9;
-			fprintf(stderr, "cpu%d: MSR_PP1_POWER_LIMIT: 0x%08llx (%slocked)\n",
+			fprintf(outf, "cpu%d: MSR_PP1_POWER_LIMIT: 0x%08llx (%slocked)\n",
 					cpu, msr, (msr >> 31) & 1 ? "": "UN");
 			print_power_limit_msr(cpu, msr, "GFX Limit");
 		}
@@ -2583,23 +2961,23 @@ double slm_bclk(void)
 	double freq;
 
 	if (get_msr(base_cpu, MSR_FSB_FREQ, &msr))
-		fprintf(stderr, "SLM BCLK: unknown\n");
+		fprintf(outf, "SLM BCLK: unknown\n");
 
 	i = msr & 0xf;
 	if (i >= SLM_BCLK_FREQS) {
-		fprintf(stderr, "SLM BCLK[%d] invalid\n", i);
+		fprintf(outf, "SLM BCLK[%d] invalid\n", i);
 		msr = 3;
 	}
 	freq = slm_freq_table[i];
 
-	fprintf(stderr, "SLM BCLK: %.1f Mhz\n", freq);
+	fprintf(outf, "SLM BCLK: %.1f Mhz\n", freq);
 
 	return freq;
 }
 
 double discover_bclk(unsigned int family, unsigned int model)
 {
-	if (has_snb_msrs(family, model))
+	if (has_snb_msrs(family, model) || is_knl(family, model))
 		return 100.00;
 	else if (is_slm(family, model))
 		return slm_bclk();
@@ -2635,13 +3013,13 @@ int set_temperature_target(struct thread_data *t, struct core_data *c, struct pk
 
 	cpu = t->cpu_id;
 	if (cpu_migrate(cpu)) {
-		fprintf(stderr, "Could not migrate to CPU %d\n", cpu);
+		fprintf(outf, "Could not migrate to CPU %d\n", cpu);
 		return -1;
 	}
 
 	if (tcc_activation_temp_override != 0) {
 		tcc_activation_temp = tcc_activation_temp_override;
-		fprintf(stderr, "cpu%d: Using cmdline TCC Target (%d C)\n",
+		fprintf(outf, "cpu%d: Using cmdline TCC Target (%d C)\n",
 			cpu, tcc_activation_temp);
 		return 0;
 	}
@@ -2656,7 +3034,7 @@ int set_temperature_target(struct thread_data *t, struct core_data *c, struct pk
 	target_c_local = (msr >> 16) & 0xFF;
 
 	if (debug)
-		fprintf(stderr, "cpu%d: MSR_IA32_TEMPERATURE_TARGET: 0x%08llx (%d C)\n",
+		fprintf(outf, "cpu%d: MSR_IA32_TEMPERATURE_TARGET: 0x%08llx (%d C)\n",
 			cpu, msr, target_c_local);
 
 	if (!target_c_local)
@@ -2668,37 +3046,93 @@ int set_temperature_target(struct thread_data *t, struct core_data *c, struct pk
 
 guess:
 	tcc_activation_temp = TJMAX_DEFAULT;
-	fprintf(stderr, "cpu%d: Guessing tjMax %d C, Please use -T to specify\n",
+	fprintf(outf, "cpu%d: Guessing tjMax %d C, Please use -T to specify\n",
 		cpu, tcc_activation_temp);
 
 	return 0;
 }
+
+void decode_feature_control_msr(void)
+{
+	unsigned long long msr;
+
+	if (!get_msr(base_cpu, MSR_IA32_FEATURE_CONTROL, &msr))
+		fprintf(outf, "cpu%d: MSR_IA32_FEATURE_CONTROL: 0x%08llx (%sLocked %s)\n",
+			base_cpu, msr,
+			msr & FEATURE_CONTROL_LOCKED ? "" : "UN-",
+			msr & (1 << 18) ? "SGX" : "");
+}
+
+void decode_misc_enable_msr(void)
+{
+	unsigned long long msr;
+
+	if (!get_msr(base_cpu, MSR_IA32_MISC_ENABLE, &msr))
+		fprintf(outf, "cpu%d: MSR_IA32_MISC_ENABLE: 0x%08llx (%s %s %s)\n",
+			base_cpu, msr,
+			msr & (1 << 3) ? "TCC" : "",
+			msr & (1 << 16) ? "EIST" : "",
+			msr & (1 << 18) ? "MONITOR" : "");
+}
+
+/*
+ * Decode MSR_MISC_PWR_MGMT
+ *
+ * Decode the bits according to the Nehalem documentation
+ * bit[0] seems to continue to have same meaning going forward
+ * bit[1] less so...
+ */
+void decode_misc_pwr_mgmt_msr(void)
+{
+	unsigned long long msr;
+
+	if (!do_nhm_platform_info)
+		return;
+
+	if (!get_msr(base_cpu, MSR_MISC_PWR_MGMT, &msr))
+		fprintf(outf, "cpu%d: MSR_MISC_PWR_MGMT: 0x%08llx (%sable-EIST_Coordination %sable-EPB)\n",
+			base_cpu, msr,
+			msr & (1 << 0) ? "DIS" : "EN",
+			msr & (1 << 1) ? "EN" : "DIS");
+}
+
 void process_cpuid()
 {
-	unsigned int eax, ebx, ecx, edx, max_level;
+	unsigned int eax, ebx, ecx, edx, max_level, max_extended_level;
 	unsigned int fms, family, model, stepping;
 
 	eax = ebx = ecx = edx = 0;
 
-	__get_cpuid(0, &max_level, &ebx, &ecx, &edx);
+	__cpuid(0, max_level, ebx, ecx, edx);
 
 	if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e)
 		genuine_intel = 1;
 
 	if (debug)
-		fprintf(stderr, "CPUID(0): %.4s%.4s%.4s ",
+		fprintf(outf, "CPUID(0): %.4s%.4s%.4s ",
 			(char *)&ebx, (char *)&edx, (char *)&ecx);
 
-	__get_cpuid(1, &fms, &ebx, &ecx, &edx);
+	__cpuid(1, fms, ebx, ecx, edx);
 	family = (fms >> 8) & 0xf;
 	model = (fms >> 4) & 0xf;
 	stepping = fms & 0xf;
 	if (family == 6 || family == 0xf)
 		model += ((fms >> 16) & 0xf) << 4;
 
-	if (debug)
-		fprintf(stderr, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n",
+	if (debug) {
+		fprintf(outf, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n",
 			max_level, family, model, stepping, family, model, stepping);
+		fprintf(outf, "CPUID(1): %s %s %s %s %s %s %s %s %s\n",
+			ecx & (1 << 0) ? "SSE3" : "-",
+			ecx & (1 << 3) ? "MONITOR" : "-",
+			ecx & (1 << 6) ? "SMX" : "-",
+			ecx & (1 << 7) ? "EIST" : "-",
+			ecx & (1 << 8) ? "TM2" : "-",
+			edx & (1 << 4) ? "TSC" : "-",
+			edx & (1 << 5) ? "MSR" : "-",
+			edx & (1 << 22) ? "ACPI-TM" : "-",
+			edx & (1 << 29) ? "TM" : "-");
+	}
 
 	if (!(edx & (1 << 5)))
 		errx(1, "CPUID: no MSR");
@@ -2709,15 +3143,15 @@ void process_cpuid()
 	 * This check is valid for both Intel and AMD.
 	 */
 	ebx = ecx = edx = 0;
-	__get_cpuid(0x80000000, &max_level, &ebx, &ecx, &edx);
+	__cpuid(0x80000000, max_extended_level, ebx, ecx, edx);
 
-	if (max_level >= 0x80000007) {
+	if (max_extended_level >= 0x80000007) {
 
 		/*
 		 * Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8
 		 * this check is valid for both Intel and AMD
 		 */
-		__get_cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+		__cpuid(0x80000007, eax, ebx, ecx, edx);
 		has_invariant_tsc = edx & (1 << 8);
 	}
 
@@ -2726,20 +3160,48 @@ void process_cpuid()
 	 * this check is valid for both Intel and AMD
 	 */
 
-	__get_cpuid(0x6, &eax, &ebx, &ecx, &edx);
+	__cpuid(0x6, eax, ebx, ecx, edx);
 	has_aperf = ecx & (1 << 0);
 	do_dts = eax & (1 << 0);
 	do_ptm = eax & (1 << 6);
+	has_hwp = eax & (1 << 7);
+	has_hwp_notify = eax & (1 << 8);
+	has_hwp_activity_window = eax & (1 << 9);
+	has_hwp_epp = eax & (1 << 10);
+	has_hwp_pkg = eax & (1 << 11);
 	has_epb = ecx & (1 << 3);
 
 	if (debug)
-		fprintf(stderr, "CPUID(6): %sAPERF, %sDTS, %sPTM, %sEPB\n",
-			has_aperf ? "" : "No ",
-			do_dts ? "" : "No ",
-			do_ptm ? "" : "No ",
-			has_epb ? "" : "No ");
+		fprintf(outf, "CPUID(6): %sAPERF, %sDTS, %sPTM, %sHWP, "
+			"%sHWPnotify, %sHWPwindow, %sHWPepp, %sHWPpkg, %sEPB\n",
+			has_aperf ? "" : "No-",
+			do_dts ? "" : "No-",
+			do_ptm ? "" : "No-",
+			has_hwp ? "" : "No-",
+			has_hwp_notify ? "" : "No-",
+			has_hwp_activity_window ? "" : "No-",
+			has_hwp_epp ? "" : "No-",
+			has_hwp_pkg ? "" : "No-",
+			has_epb ? "" : "No-");
+
+	if (debug)
+		decode_misc_enable_msr();
+
+	if (max_level >= 0x7) {
+		int has_sgx;
 
-	if (max_level > 0x15) {
+		ecx = 0;
+
+		__cpuid_count(0x7, 0, eax, ebx, ecx, edx);
+
+		has_sgx = ebx & (1 << 2);
+		fprintf(outf, "CPUID(7): %sSGX\n", has_sgx ? "" : "No-");
+
+		if (has_sgx)
+			decode_feature_control_msr();
+	}
+
+	if (max_level >= 0x15) {
 		unsigned int eax_crystal;
 		unsigned int ebx_tsc;
 
@@ -2747,12 +3209,12 @@ void process_cpuid()
 		 * CPUID 15H TSC/Crystal ratio, possibly Crystal Hz
 		 */
 		eax_crystal = ebx_tsc = crystal_hz = edx = 0;
-		__get_cpuid(0x15, &eax_crystal, &ebx_tsc, &crystal_hz, &edx);
+		__cpuid(0x15, eax_crystal, ebx_tsc, crystal_hz, edx);
 
 		if (ebx_tsc != 0) {
 
 			if (debug && (ebx != 0))
-				fprintf(stderr, "CPUID(0x15): eax_crystal: %d ebx_tsc: %d ecx_crystal_hz: %d\n",
+				fprintf(outf, "CPUID(0x15): eax_crystal: %d ebx_tsc: %d ecx_crystal_hz: %d\n",
 					eax_crystal, ebx_tsc, crystal_hz);
 
 			if (crystal_hz == 0)
@@ -2768,11 +3230,24 @@ void process_cpuid()
 			if (crystal_hz) {
 				tsc_hz =  (unsigned long long) crystal_hz * ebx_tsc / eax_crystal;
 				if (debug)
-					fprintf(stderr, "TSC: %lld MHz (%d Hz * %d / %d / 1000000)\n",
+					fprintf(outf, "TSC: %lld MHz (%d Hz * %d / %d / 1000000)\n",
 						tsc_hz / 1000000, crystal_hz, ebx_tsc,  eax_crystal);
 			}
 		}
 	}
+	if (max_level >= 0x16) {
+		unsigned int base_mhz, max_mhz, bus_mhz, edx;
+
+		/*
+		 * CPUID 16H Base MHz, Max MHz, Bus MHz
+		 */
+		base_mhz = max_mhz = bus_mhz = edx = 0;
+
+		__cpuid(0x16, base_mhz, max_mhz, bus_mhz, edx);
+		if (debug)
+			fprintf(outf, "CPUID(0x16): base_mhz: %d max_mhz: %d bus_mhz: %d\n",
+				base_mhz, max_mhz, bus_mhz);
+	}
 
 	if (has_aperf)
 		aperf_mperf_multiplier = get_aperf_mperf_multiplier(family, model);
@@ -2788,6 +3263,9 @@ void process_cpuid()
 	do_slm_cstates = is_slm(family, model);
 	do_knl_cstates  = is_knl(family, model);
 
+	if (debug)
+		decode_misc_pwr_mgmt_msr();
+
 	rapl_probe(family, model);
 	perf_limit_reasons_probe(family, model);
 
@@ -2797,12 +3275,16 @@ void process_cpuid()
 	if (has_skl_msrs(family, model))
 		calculate_tsc_tweak();
 
+	do_gfx_rc6_ms = !access("/sys/class/drm/card0/power/rc6_residency_ms", R_OK);
+
+	do_gfx_mhz = !access("/sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz", R_OK);
+
 	return;
 }
 
 void help()
 {
-	fprintf(stderr,
+	fprintf(outf,
 	"Usage: turbostat [OPTIONS][(--interval seconds) | COMMAND ...]\n"
 	"\n"
 	"Turbostat forks the specified COMMAND and prints statistics\n"
@@ -2814,6 +3296,7 @@ void help()
 	"--help		print this help message\n"
 	"--counter msr	print 32-bit counter at address \"msr\"\n"
 	"--Counter msr	print 64-bit Counter at address \"msr\"\n"
+	"--out file	create or truncate \"file\" for all output\n"
 	"--msr msr	print 32-bit value at address \"msr\"\n"
 	"--MSR msr	print 64-bit Value at address \"msr\"\n"
 	"--version	print version information\n"
@@ -2858,7 +3341,7 @@ void topology_probe()
 		show_cpu = 1;
 
 	if (debug > 1)
-		fprintf(stderr, "num_cpus %d max_cpu_num %d\n", topo.num_cpus, topo.max_cpu_num);
+		fprintf(outf, "num_cpus %d max_cpu_num %d\n", topo.num_cpus, topo.max_cpu_num);
 
 	cpus = calloc(1, (topo.max_cpu_num  + 1) * sizeof(struct cpu_topology));
 	if (cpus == NULL)
@@ -2893,7 +3376,7 @@ void topology_probe()
 
 		if (cpu_is_not_present(i)) {
 			if (debug > 1)
-				fprintf(stderr, "cpu%d NOT PRESENT\n", i);
+				fprintf(outf, "cpu%d NOT PRESENT\n", i);
 			continue;
 		}
 		cpus[i].core_id = get_core_id(i);
@@ -2908,26 +3391,26 @@ void topology_probe()
 		if (siblings > max_siblings)
 			max_siblings = siblings;
 		if (debug > 1)
-			fprintf(stderr, "cpu %d pkg %d core %d\n",
+			fprintf(outf, "cpu %d pkg %d core %d\n",
 				i, cpus[i].physical_package_id, cpus[i].core_id);
 	}
 	topo.num_cores_per_pkg = max_core_id + 1;
 	if (debug > 1)
-		fprintf(stderr, "max_core_id %d, sizing for %d cores per package\n",
+		fprintf(outf, "max_core_id %d, sizing for %d cores per package\n",
 			max_core_id, topo.num_cores_per_pkg);
 	if (debug && !summary_only && topo.num_cores_per_pkg > 1)
 		show_core = 1;
 
 	topo.num_packages = max_package_id + 1;
 	if (debug > 1)
-		fprintf(stderr, "max_package_id %d, sizing for %d packages\n",
+		fprintf(outf, "max_package_id %d, sizing for %d packages\n",
 			max_package_id, topo.num_packages);
 	if (debug && !summary_only && topo.num_packages > 1)
 		show_pkg = 1;
 
 	topo.num_threads_per_core = max_siblings;
 	if (debug > 1)
-		fprintf(stderr, "max_siblings %d\n", max_siblings);
+		fprintf(outf, "max_siblings %d\n", max_siblings);
 
 	free(cpus);
 }
@@ -3019,10 +3502,27 @@ void allocate_output_buffer()
 	if (outp == NULL)
 		err(-1, "calloc output buffer");
 }
+void allocate_fd_percpu(void)
+{
+	fd_percpu = calloc(topo.max_cpu_num, sizeof(int));
+	if (fd_percpu == NULL)
+		err(-1, "calloc fd_percpu");
+}
+void allocate_irq_buffers(void)
+{
+	irq_column_2_cpu = calloc(topo.num_cpus, sizeof(int));
+	if (irq_column_2_cpu == NULL)
+		err(-1, "calloc %d", topo.num_cpus);
 
+	irqs_per_cpu = calloc(topo.max_cpu_num, sizeof(int));
+	if (irqs_per_cpu == NULL)
+		err(-1, "calloc %d", topo.max_cpu_num);
+}
 void setup_all_buffers(void)
 {
 	topology_probe();
+	allocate_irq_buffers();
+	allocate_fd_percpu();
 	allocate_counters(&thread_even, &core_even, &package_even);
 	allocate_counters(&thread_odd, &core_odd, &package_odd);
 	allocate_output_buffer();
@@ -3036,7 +3536,7 @@ void set_base_cpu(void)
 		err(-ENODEV, "No valid cpus found");
 
 	if (debug > 1)
-		fprintf(stderr, "base_cpu = %d\n", base_cpu);
+		fprintf(outf, "base_cpu = %d\n", base_cpu);
 }
 
 void turbostat_init()
@@ -3049,6 +3549,9 @@ void turbostat_init()
 
 
 	if (debug)
+		for_all_cpus(print_hwp, ODD_COUNTERS);
+
+	if (debug)
 		for_all_cpus(print_epb, ODD_COUNTERS);
 
 	if (debug)
@@ -3100,9 +3603,10 @@ int fork_it(char **argv)
 	for_all_cpus_2(delta_cpu, ODD_COUNTERS, EVEN_COUNTERS);
 	compute_average(EVEN_COUNTERS);
 	format_all_counters(EVEN_COUNTERS);
-	flush_stderr();
 
-	fprintf(stderr, "%.6f sec\n", tv_delta.tv_sec + tv_delta.tv_usec/1000000.0);
+	fprintf(outf, "%.6f sec\n", tv_delta.tv_sec + tv_delta.tv_usec/1000000.0);
+
+	flush_output_stderr();
 
 	return status;
 }
@@ -3119,13 +3623,13 @@ int get_and_dump_counters(void)
 	if (status)
 		return status;
 
-	flush_stdout();
+	flush_output_stdout();
 
 	return status;
 }
 
 void print_version() {
-	fprintf(stderr, "turbostat version 4.8 26-Sep, 2015"
+	fprintf(outf, "turbostat version 4.11 27 Feb 2016"
 		" - Len Brown <lenb@kernel.org>\n");
 }
 
@@ -3143,6 +3647,7 @@ void cmdline(int argc, char **argv)
 		{"Joules",	no_argument,		0, 'J'},
 		{"MSR",		required_argument,	0, 'M'},
 		{"msr",		required_argument,	0, 'm'},
+		{"out",		required_argument,	0, 'o'},
 		{"Package",	no_argument,		0, 'p'},
 		{"processor",	no_argument,		0, 'p'},
 		{"Summary",	no_argument,		0, 'S'},
@@ -3153,7 +3658,7 @@ void cmdline(int argc, char **argv)
 
 	progname = argv[0];
 
-	while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:PpST:v",
+	while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:PpST:v",
 				long_options, &option_index)) != -1) {
 		switch (opt) {
 		case 'C':
@@ -3173,7 +3678,18 @@ void cmdline(int argc, char **argv)
 			help();
 			exit(1);
 		case 'i':
-			interval_sec = atoi(optarg);
+			{
+				double interval = strtod(optarg, NULL);
+
+				if (interval < 0.001) {
+					fprintf(outf, "interval %f seconds is too small\n",
+						interval);
+					exit(2);
+				}
+
+				interval_ts.tv_sec = interval;
+				interval_ts.tv_nsec = (interval - interval_ts.tv_sec) * 1000000000;
+			}
 			break;
 		case 'J':
 			rapl_joules++;
@@ -3184,6 +3700,9 @@ void cmdline(int argc, char **argv)
 		case 'm':
 			sscanf(optarg, "%x", &extra_msr_offset32);
 			break;
+		case 'o':
+			outf = fopen_or_die(optarg, "w");
+			break;
 		case 'P':
 			show_pkg_only++;
 			break;
@@ -3206,6 +3725,8 @@ void cmdline(int argc, char **argv)
 
 int main(int argc, char **argv)
 {
+	outf = stderr;
+
 	cmdline(argc, argv);
 
 	if (debug)