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perf: Add pmu specific data for perf task context

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Introduce a new flag PERF_ATTACH_TASK_DATA for perf event's attach
stata. The flag is set by PMU's event_init() callback, it indicates
that perf event needs PMU specific data.

The PMU specific data are initialized to zeros. Later patches will
use PMU specific data to save 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: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: eranian@google.com
Cc: jolsa@redhat.com
Link: http://lkml.kernel.org/r/1415156173-10035-6-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 21:56:01 -05:00
committed by Ingo Molnar
parent e9d7f7cd97
commit 4af57ef28c
2 changed files with 42 additions and 4 deletions
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6
include/linux/perf_event.h
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@@ -271,6 +271,10 @@ struct pmu {
*/
void (*sched_task) (struct perf_event_context *ctx,
bool sched_in);
/*
* PMU specific data size
*/
size_t task_ctx_size;
};
@@ -307,6 +311,7 @@ struct swevent_hlist {
#define PERF_ATTACH_CONTEXT 0x01
#define PERF_ATTACH_GROUP 0x02
#define PERF_ATTACH_TASK 0x04
#define PERF_ATTACH_TASK_DATA 0x08
struct perf_cgroup;
struct ring_buffer;
@@ -511,6 +516,7 @@ struct perf_event_context {
u64 generation;
int pin_count;
int nr_cgroups; /* cgroup evts */
void *task_ctx_data; /* pmu specific data */
struct rcu_head rcu_head;
struct delayed_work orphans_remove;