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perf/x86/intel: Use context switch callback to flush LBR stack

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Previous commit introduces context switch callback, its function
overlaps with the flush branch stack callback. So we can use the
context switch callback to flush LBR stack.

This patch adds code that uses the flush branch callback to
flush the LBR stack when task is being scheduled in. The callback
is enabled only when there are events use the LBR hardware. This
patch also removes all old flush branch stack code.

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/1415156173-10035-4-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Yan, Zheng
2014-11-04 21:55:59 -05:00
committed by Ingo Molnar
parent ba532500c5
commit 2a0ad3b326
6 changed files with 30 additions and 99 deletions
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7
arch/x86/kernel/cpu/perf_event.c
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@@ -1920,12 +1920,6 @@ static void x86_pmu_sched_task(struct perf_event_context *ctx, bool sched_in)
x86_pmu.sched_task(ctx, sched_in);
}
static void x86_pmu_flush_branch_stack(void)
{
if (x86_pmu.flush_branch_stack)
x86_pmu.flush_branch_stack();
}
void perf_check_microcode(void)
{
if (x86_pmu.check_microcode)
@@ -1955,7 +1949,6 @@ static struct pmu pmu = {
.commit_txn = x86_pmu_commit_txn,
.event_idx = x86_pmu_event_idx,
.flush_branch_stack = x86_pmu_flush_branch_stack,
.sched_task = x86_pmu_sched_task,
};