sched/cputime, powerpc: Prepare accounting structure for cputime flush on tick

In order to prepare for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y to delay
cputime accounting to the tick, provide finegrained accumulators to
powerpc in order to store the cputime until flushing.

While at it, normalize the name of several fields according to common
cputime naming.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1483636310-6557-6-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 16 insertions, 15 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index ce2165089318..17a2cd1c6a75 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -271,8 +271,8 @@ void accumulate_stolen_time(void)
 
 	sst = scan_dispatch_log(acct->starttime_user);
 	ust = scan_dispatch_log(acct->starttime);
-	acct->system_time -= sst;
-	acct->user_time -= ust;
+	acct->stime -= sst;
+	acct->utime -= ust;
 	local_paca->stolen_time += ust + sst;
 
 	local_paca->soft_enabled = save_soft_enabled;
@@ -281,10 +281,11 @@ void accumulate_stolen_time(void)
 static inline u64 calculate_stolen_time(u64 stop_tb)
 {
 	u64 stolen = 0;
+	struct cpu_accounting_data *acct = &local_paca->accounting;
 
 	if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) {
 		stolen = scan_dispatch_log(stop_tb);
-		get_paca()->accounting.system_time -= stolen;
+		acct->stime -= stolen;
 	}
 
 	stolen += get_paca()->stolen_time;
@@ -316,17 +317,17 @@ static unsigned long vtime_delta(struct task_struct *tsk,
 
 	now = mftb();
 	nowscaled = read_spurr(now);
-	acct->system_time += now - acct->starttime;
+	acct->stime += now - acct->starttime;
 	acct->starttime = now;
 	deltascaled = nowscaled - acct->startspurr;
 	acct->startspurr = nowscaled;
 
 	*stolen = calculate_stolen_time(now);
 
-	delta = acct->system_time;
-	acct->system_time = 0;
-	udelta = acct->user_time - acct->utime_sspurr;
-	acct->utime_sspurr = acct->user_time;
+	delta = acct->stime;
+	acct->stime = 0;
+	udelta = acct->utime - acct->utime_sspurr;
+	acct->utime_sspurr = acct->utime;
 
 	/*
 	 * Because we don't read the SPURR on every kernel entry/exit,
@@ -348,7 +349,7 @@ static unsigned long vtime_delta(struct task_struct *tsk,
 			*sys_scaled = deltascaled;
 		}
 	}
-	acct->user_time_scaled += user_scaled;
+	acct->utime_scaled += user_scaled;
 
 	return delta;
 }
@@ -387,10 +388,10 @@ void vtime_account_user(struct task_struct *tsk)
 	cputime_t utime, utimescaled;
 	struct cpu_accounting_data *acct = get_accounting(tsk);
 
-	utime = acct->user_time;
-	utimescaled = acct->user_time_scaled;
-	acct->user_time = 0;
-	acct->user_time_scaled = 0;
+	utime = acct->utime;
+	utimescaled = acct->utime_scaled;
+	acct->utime = 0;
+	acct->utime_scaled = 0;
 	acct->utime_sspurr = 0;
 	account_user_time(tsk, utime);
 	tsk->utimescaled += utimescaled;
@@ -408,8 +409,8 @@ void arch_vtime_task_switch(struct task_struct *prev)
 
 	acct->starttime = get_accounting(prev)->starttime;
 	acct->startspurr = get_accounting(prev)->startspurr;
-	acct->system_time = 0;
-	acct->user_time = 0;
+	acct->stime = 0;
+	acct->utime = 0;
 }
 #endif /* CONFIG_PPC32 */