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authorArnaldo Carvalho de Melo <acme@redhat.com>2019-10-08 12:33:08 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-10-09 16:23:52 +0200
commitd4097f1937f2242d0aa0a7c654d2159a6895e5c8 (patch)
treedd98363c35200ccce767a8c9ee07b4d7a10d208a /tools/perf/builtin-trace.c
parentperf evlist: Introduce append_tp_filter_pid() and append_tp_filter_pids() (diff)
downloadlinux-d4097f1937f2242d0aa0a7c654d2159a6895e5c8.tar.xz
linux-d4097f1937f2242d0aa0a7c654d2159a6895e5c8.zip
perf trace: Introduce --filter for tracepoint events
Similar to what is in 'perf record', works just like there: # perf trace -e msr:* 328.297 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.302 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.306 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.317 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.322 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.327 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.331 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.336 :0/0 msr:write_msr(msr: FS_BASE, val: 140240388381888) 328.340 :0/0 ^Cmsr:write_msr(msr: FS_BASE, val: 140240388381888) # So, for a system wide trace session looking at the write_msr tracepoint we see a flood of MSR_FS_BASE, we need to get the number for that: # grep FS_BASE /tmp/build/perf/trace/beauty/generated/x86_arch_MSRs_array.c [0xc0000100 - x86_64_specific_MSRs_offset] = "FS_BASE", # And then use it in a filter: # perf trace -e msr:* --filter="msr!=0xc0000100" <SNIP> 942.177 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 3056931068232) 942.199 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 3057135655252) 942.203 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 3056931068222) 942.231 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 3056998373022) 942.241 :0/0 msr:write_msr(msr: IA32_TSC_DEADLINE, val: 3056931068236) <SNIP> # Ok, lets filter that too, too noisy: # grep TSC_DEADLINE /tmp/build/perf/trace/beauty/generated/x86_arch_MSRs_array.c [0x000006E0] = "IA32_TSC_DEADLINE", # # perf trace -e msr:* --filter="msr!=0xc0000100 && msr!=0x6e0" -a sleep 0.1 0.000 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 0.066 CPU 0/KVM/4895 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6) 0.070 CPU 0/KVM/4895 msr:write_msr(msr: 0x830, val: 34359740667) 0.099 CPU 0/KVM/4895 msr:read_msr(msr: IA32_SYSENTER_ESP, val: -2199021993472) 0.100 CPU 0/KVM/4895 msr:read_msr(msr: IA32_APICBASE, val: 4276096000) 0.101 CPU 0/KVM/4895 msr:read_msr(msr: IA32_DEBUGCTLMSR) 0.109 :0/0 msr:write_msr(msr: IA32_SPEC_CTRL) 1.000 :0/0 msr:write_msr(msr: 0x830, val: 17179871485) 18.893 :0/0 msr:write_msr(msr: 0x83f, val: 246) 28.810 :0/0 msr:write_msr(msr: 0x830, val: 68719479037) 40.117 CPU 0/KVM/4895 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6) 40.127 CPU 0/KVM/4895 msr:read_msr(msr: IA32_DEBUGCTLMSR) 40.139 CPU 0/KVM/4895 msr:write_msr(msr: LSTAR, val: -2130661312) 40.141 CPU 0/KVM/4895 msr:write_msr(msr: SYSCALL_MASK, val: 14080) 40.142 CPU 0/KVM/4895 msr:write_msr(msr: TSC_AUX) 40.144 CPU 0/KVM/4895 msr:write_msr(msr: KERNEL_GS_BASE) 40.147 CPU 0/KVM/4895 msr:write_msr(msr: IA32_SPEC_CTRL) 40.148 CPU 0/KVM/4895 msr:write_msr(msr: IA32_FLUSH_CMD, val: 1) 40.151 CPU 0/KVM/4895 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6) ^C # One can combine that with filtering pids as well: # perf trace -e msr:* --filter="msr!=0xc0000100 && msr!=0x6e0" --filter-pids 4895 -a sleep 0.09 0.000 :0/0 msr:write_msr(msr: 0x830, val: 4294969597) 0.291 gnome-terminal/2790 msr:write_msr(msr: SYSCALL_MASK, val: 292608) 0.294 gnome-terminal/2790 msr:write_msr(msr: LSTAR, val: -1935671280) 0.295 gnome-terminal/2790 msr:write_msr(msr: TSC_AUX, val: 6) 10.940 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 15.943 gnome-shell/2096 msr:write_msr(msr: 0x830, val: 4294969597) 16.975 :0/0 msr:write_msr(msr: 0x830, val: 4294969597) 19.560 :0/0 msr:write_msr(msr: 0x83f, val: 246) 25.162 :0/0 msr:read_msr(msr: IA32_TSC_ADJUST) 25.807 JS Watchdog/3635 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6) 25.820 :0/0 msr:write_msr(msr: IA32_SPEC_CTRL) 25.941 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 26.941 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 29.942 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 45.313 :0/0 msr:write_msr(msr: 0x83f, val: 246) 56.945 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 60.946 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 4294969597) 74.096 JS Watchdog/8971 msr:write_msr(msr: IA32_SPEC_CTRL, val: 6) 74.130 :0/0 msr:write_msr(msr: IA32_SPEC_CTRL) 79.673 :0/0 msr:write_msr(msr: 0x83f, val: 246) 79.947 gnome-terminal/2790 msr:write_msr(msr: 0x830, val: 17179871485) # Or for just a pid, with callchains: # grep SYSCALL_MAS /tmp/build/perf/trace/beauty/generated/x86_arch_MSRs_array.c [0xc0000084 - x86_64_specific_MSRs_offset] = "SYSCALL_MASK", # perf trace -e msr:* --filter="msr==0xc0000084" --pid 2790 --call-graph=dwarf 0.000 gnome-terminal/2790 msr:write_msr(msr: SYSCALL_MASK, val: 292608) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) kvm_on_user_return ([kvm]) fire_user_return_notifiers ([kernel.kallsyms]) exit_to_usermode_loop ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64 ([kernel.kallsyms]) __GI___poll (inlined) 9299.073 gnome-terminal/2790 msr:write_msr(msr: SYSCALL_MASK, val: 292608) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) kvm_on_user_return ([kvm]) fire_user_return_notifiers ([kernel.kallsyms]) exit_to_usermode_loop ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64 ([kernel.kallsyms]) __GI___poll (inlined) 9348.374 gnome-terminal/2790 msr:write_msr(msr: SYSCALL_MASK, val: 292608) do_trace_write_msr ([kernel.kallsyms]) do_trace_write_msr ([kernel.kallsyms]) kvm_on_user_return ([kvm]) fire_user_return_notifiers ([kernel.kallsyms]) exit_to_usermode_loop ([kernel.kallsyms]) do_syscall_64 ([kernel.kallsyms]) entry_SYSCALL_64 ([kernel.kallsyms]) __GI___poll (inlined) <SNIP> # Ok, just another form of KVM to emit MSRs :-) Next step: elliminate those greps by getting the filter expression, looking for arg names, then for the arrays associated with it to do a reverse lookup. Also allow those filters to be associated with strace-like syscall names. After that: augment the 'val' arg for 'msr:write_msr' based on the first arg, 'msr'. Then, do that with eBPF too, not just with tracepoint filters. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-95bfe5d4tzy5f66bx49d05rj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
-rw-r--r--tools/perf/builtin-trace.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index e9f132aa5a09..2c1968061b4b 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3362,7 +3362,7 @@ static int trace__set_filter_loop_pids(struct trace *trace)
thread = parent;
}
- err = perf_evlist__set_tp_filter_pids(trace->evlist, nr, pids);
+ err = perf_evlist__append_tp_filter_pids(trace->evlist, nr, pids);
if (!err && trace->filter_pids.map)
err = bpf_map__set_filter_pids(trace->filter_pids.map, nr, pids);
@@ -3379,8 +3379,8 @@ static int trace__set_filter_pids(struct trace *trace)
* we fork the workload in perf_evlist__prepare_workload.
*/
if (trace->filter_pids.nr > 0) {
- err = perf_evlist__set_tp_filter_pids(trace->evlist, trace->filter_pids.nr,
- trace->filter_pids.entries);
+ err = perf_evlist__append_tp_filter_pids(trace->evlist, trace->filter_pids.nr,
+ trace->filter_pids.entries);
if (!err && trace->filter_pids.map) {
err = bpf_map__set_filter_pids(trace->filter_pids.map, trace->filter_pids.nr,
trace->filter_pids.entries);
@@ -4294,6 +4294,8 @@ int cmd_trace(int argc, const char **argv)
OPT_CALLBACK('e', "event", &trace, "event",
"event/syscall selector. use 'perf list' to list available events",
trace__parse_events_option),
+ OPT_CALLBACK(0, "filter", &trace.evlist, "filter",
+ "event filter", parse_filter),
OPT_BOOLEAN(0, "comm", &trace.show_comm,
"show the thread COMM next to its id"),
OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),