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perf/x86: Ensure perf_sched_cb_{inc,dec}() is only called from pmu::{add,del}()

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Currently perf_sched_cb_{inc,dec}() are called from
pmu::{start,stop}(), which has the problem that this can happen from
NMI context, this is making it hard to optimize perf_pmu_sched_task().

Furthermore, we really only need this accounting on pmu::{add,del}(),
so doing it from pmu::{start,stop}() is doing more work than we really
need.

Introduce x86_pmu::{add,del}() and wire up the LBR and PEBS.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2016-07-06 18:02:43 +02:00 • committed by Ingo Molnar
parent 09e61b4f78
commit 68f7082ffb
5 changed files with 52 additions and 25 deletions
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10
arch/x86/events/perf_event.h
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@ -510,6 +510,8 @@ struct x86_pmu {
void (*enable_all)(int added);
void (*enable)(struct perf_event *);
void (*disable)(struct perf_event *);
void (*add)(struct perf_event *);
void (*del)(struct perf_event *);
int (*hw_config)(struct perf_event *event);
int (*schedule_events)(struct cpu_hw_events *cpuc, int n, int *assign);
unsigned eventsel;
@ -890,6 +892,10 @@ extern struct event_constraint intel_skl_pebs_event_constraints[];
struct event_constraint *intel_pebs_constraints(struct perf_event *event);
void intel_pmu_pebs_add(struct perf_event *event);
void intel_pmu_pebs_del(struct perf_event *event);
void intel_pmu_pebs_enable(struct perf_event *event);
void intel_pmu_pebs_disable(struct perf_event *event);
@ -908,9 +914,9 @@ u64 lbr_from_signext_quirk_wr(u64 val);
void intel_pmu_lbr_reset(void);
void intel_pmu_lbr_enable(struct perf_event *event);
void intel_pmu_lbr_add(struct perf_event *event);
void intel_pmu_lbr_disable(struct perf_event *event);
void intel_pmu_lbr_del(struct perf_event *event);
void intel_pmu_lbr_enable_all(bool pmi);