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perf/core: Generalize event->group_flags

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Currently, PERF_GROUP_SOFTWARE is used in the group_flags field of a
group's leader to indicate that is_software_event(event) is true for all
events in a group. This is the only usage of event->group_flags.

This pattern of setting a group level flags when all events in the group
share a property is useful for the flag introduced in the next patch and
for future CQM/CMT flags. So this patches generalizes group_flags to work
as an aggregate of event level flags.

PERF_GROUP_SOFTWARE denotes an inmutable event's property. All other flags
that I intend to add are also determinable at event initialization.
To better convey the above, this patch renames event's group_flags to
group_caps and PERF_GROUP_SOFTWARE to PERF_EV_CAP_SOFTWARE.

Individual event flags are stored in the new event->event_caps. Since the
cap flags do not change after event initialization, there is no need to
serialize event_caps. This new field is used when events are added to a
context, similarly to how PERF_GROUP_SOFTWARE and is_software_event()
worked.

Lastly, for consistency, updates is_software_event() to rely in event_cap
instead of the context index.

Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
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: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1471467307-61171-3-git-send-email-davidcc@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
David Carrillo-Cisneros
2016-08-17 13:55:05 -07:00
committed by Ingo Molnar
parent 29dd328870
commit 4ff6a8debf
2 changed files with 21 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/perf_event.h
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@@ -510,9 +510,12 @@ typedef void (*perf_overflow_handler_t)(struct perf_event *,
struct perf_sample_data *,
struct pt_regs *regs);
enum perf_group_flag {
PERF_GROUP_SOFTWARE = 0x1,
};
/*
* Event capabilities. For event_caps and groups caps.
*
* PERF_EV_CAP_SOFTWARE: Is a software event.
*/
#define PERF_EV_CAP_SOFTWARE BIT(0)
#define SWEVENT_HLIST_BITS 8
#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
@@ -568,7 +571,12 @@ struct perf_event {
struct hlist_node hlist_entry;
struct list_head active_entry;
int nr_siblings;
int group_flags;
/* Not serialized. Only written during event initialization. */
int event_caps;
/* The cumulative AND of all event_caps for events in this group. */
int group_caps;
struct perf_event *group_leader;
struct pmu *pmu;
void *pmu_private;
@@ -988,7 +996,7 @@ static inline bool is_sampling_event(struct perf_event *event)
*/
static inline int is_software_event(struct perf_event *event)
{
return event->pmu->task_ctx_nr == perf_sw_context;
return event->event_caps & PERF_EV_CAP_SOFTWARE;
}
extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];