diff options
| author | Yan, Zheng <zheng.z.yan@intel.com> | 2014-11-04 21:55:58 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-02-18 17:16:02 +0100 |
| commit | ba532500c5651a4be4108acc64ed99a95cb005b3 (patch) | |
| tree | 6fe0a328c1b461bea944dd4b1c9aa46fb71b0fd4 /arch/x86/kernel/cpu/perf_event.c | |
| parent | 27ac905b8f88d28779b0661809286b5ba2817d37 (diff) | |
perf: Introduce pmu context switch callback
The callback is invoked when process is scheduled in or out.
It provides mechanism for later patches to save/store the LBR
stack. For the schedule in case, the callback is invoked at
the same place that flush branch stack callback is invoked.
So it also can replace the flush branch stack callback. To
avoid unnecessary overhead, the callback is enabled only when
there are events use the LBR stack.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: eranian@google.com
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1415156173-10035-3-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/cpu/perf_event.c')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index b71a7f86d68a..0efbd6cc2966 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1914,6 +1914,12 @@ static const struct attribute_group *x86_pmu_attr_groups[] = { NULL, }; +static void x86_pmu_sched_task(struct perf_event_context *ctx, bool sched_in) +{ + if (x86_pmu.sched_task) + x86_pmu.sched_task(ctx, sched_in); +} + static void x86_pmu_flush_branch_stack(void) { if (x86_pmu.flush_branch_stack) @@ -1950,6 +1956,7 @@ static struct pmu pmu = { .event_idx = x86_pmu_event_idx, .flush_branch_stack = x86_pmu_flush_branch_stack, + .sched_task = x86_pmu_sched_task, }; void arch_perf_update_userpage(struct perf_event *event, |