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perf/core, perf/x86: Introduce swap_task_ctx() method at 'struct pmu' 

Declare swap_task_ctx() methods at the generic and x86 specific
pmu types to bridge calls to platform specific PMU code on optimized
context switch path between equivalent task perf event contexts.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lkml.kernel.org/r/9a0aa84a-f062-9b64-3133-373658550c4b@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alexey Budankov 2019-10-23 10:11:04 +03:00 committed by Ingo Molnar
parent 65133033ee
commit fc1adfe306
2 changed files with 17 additions and 0 deletions
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8
arch/x86/events/perf_event.h
View File

@ -682,6 +682,14 @@ struct x86_pmu {
*/
atomic_t lbr_exclusive[x86_lbr_exclusive_max];
/*
* perf task context (i.e. struct perf_event_context::task_ctx_data)
* switch helper to bridge calls from perf/core to perf/x86.
* See struct pmu::swap_task_ctx() usage for examples;
*/
void (*swap_task_ctx)(struct perf_event_context *prev,
struct perf_event_context *next);
/*
* AMD bits
*/

9
include/linux/perf_event.h
View File

@ -410,6 +410,15 @@ struct pmu {
*/
size_t task_ctx_size;
/*
* PMU specific parts of task perf event context (i.e. ctx->task_ctx_data)
* can be synchronized using this function. See Intel LBR callstack support
* implementation and Perf core context switch handling callbacks for usage
* examples.
*/
void (*swap_task_ctx) (struct perf_event_context *prev,
struct perf_event_context *next);
/* optional */
/*
* Set up pmu-private data structures for an AUX area