Kan Liang 44fae179ce
perf/core: Pull pmu::sched_task() into perf_event_context_sched_out() ...
The pmu::sched_task() is a context switch callback. It passes the
cpuctx->task_ctx as a parameter to the lower code. To find the
cpuctx->task_ctx, the current code iterates a cpuctx list.
The same context will iterated in perf_event_context_sched_out() soon.
Share the cpuctx->task_ctx can avoid the unnecessary iteration of the
cpuctx list.
The pmu::sched_task() is also required for the optimization case for
equivalent contexts.
The task_ctx_sched_out() will eventually disable and reenable the PMU
when schedule out events. Add perf_pmu_disable() and perf_pmu_enable()
around task_ctx_sched_out() don't break anything.
Drop the cpuctx->ctx.lock for the pmu::sched_task(). The lock is for
per-CPU context, which is not necessary for the per-task context
schedule.
No one uses sched_cb_entry, perf_sched_cb_usages, sched_cb_list, and
perf_pmu_sched_task() any more.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org >
Signed-off-by: Kan Liang <kan.liang@linux.intel.com >
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org >
Link: https://lkml.kernel.org/r/20200821195754.20159-2-kan.liang@linux.intel.com
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