perf_event_enable_on_exec

Name:Enable all of a task's events that have been marked enable-on-exec.* This expects task == current.

Proto:static void perf_event_enable_on_exec(int ctxn)

Type:void

Parameter:

Type	Parameter	Name
int	ctxn

3932

struct perf_event_context * ctx, * clone_ctx = NULL

3933

3937

enabled = 0

3939

local_irq_save(flags)

3940

ctx = perf_event_ctxp[ctxn]

3941

If Not ctx || Not nr_events Then Go to out

3944

cpuctx = __get_cpu_context(ctx)

3945

perf_ctx_lock(cpuctx, ctx)

3946

ctx_sched_out(ctx, cpuctx, EVENT_TIME)

3948

enabled |= event_enable_on_exec(event, ctx)

3949

event_type |= get_event_type(event)

3955

If enabled Then

3956

clone_ctx = This must be done under the ctx->lock, such as to serialize against* context_equiv(), therefore we cannot call put_ctx() since that might end up* calling scheduler related locks and ctx->lock nests inside those.

3957

We want to maintain the following priority of scheduling:* - CPU pinned (EVENT_CPU | EVENT_PINNED)* - task pinned (EVENT_PINNED)* - CPU flexible (EVENT_CPU | EVENT_FLEXIBLE)* - task flexible (EVENT_FLEXIBLE)

3958

Else

3959

ctx_sched_in(ctx, cpuctx, EVENT_TIME, current process)

3961

perf_ctx_unlock(cpuctx, ctx)

3963

out :

3964

local_irq_restore(flags)

3966

If clone_ctx Then put_ctx(clone_ctx)

**Caller**
Name	Describe
perf_event_exec

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