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bpf: perf event change needed for subsequent bpf helpers

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This patch does not impact existing functionalities.
It contains the changes in perf event area needed for
subsequent bpf_perf_event_read_value and
bpf_perf_prog_read_value helpers.

Signed-off-by: Yonghong Song <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Yonghong Song 2017-10-05 09:19:19 -07:00 • committed by David S. Miller
commit 97562633bc
4 changed files with 20 additions and 6 deletions
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15
kernel/events/core.c
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@ -3684,10 +3684,12 @@ static inline u64 perf_event_count(struct perf_event *event)
* will not be local and we cannot read them atomically
* - must not have a pmu::count method
*/
int perf_event_read_local(struct perf_event *event, u64 *value)
int perf_event_read_local(struct perf_event *event, u64 *value,
u64 *enabled, u64 *running)
{
unsigned long flags;
int ret = 0;
u64 now;
/*
* Disabling interrupts avoids all counter scheduling (context
@ -3718,13 +3720,21 @@ int perf_event_read_local(struct perf_event *event, u64 *value)
goto out;
}
now = event->shadow_ctx_time + perf_clock();
if (enabled)
*enabled = now - event->tstamp_enabled;
/*
* If the event is currently on this CPU, its either a per-task event,
* or local to this CPU. Furthermore it means its ACTIVE (otherwise
* oncpu == -1).
*/
if (event->oncpu == smp_processor_id())
if (event->oncpu == smp_processor_id()) {
event->pmu->read(event);
if (running)
*running = now - event->tstamp_running;
} else if (running) {
*running = event->total_time_running;
}
*value = local64_read(&event->count);
out:
@ -8072,6 +8082,7 @@ static void bpf_overflow_handler(struct perf_event *event,
struct bpf_perf_event_data_kern ctx = {
.data = data,
.regs = regs,
.event = event,
};
int ret = 0;