linux-kernel - Re: [PATCH V5 02/16] perf, core: introduce pmu context switch callback

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Date:	Wed, 24 Sep 2014 15:13:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	kan.liang@...el.com
Cc:	eranian@...gle.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
	paulus@...ba.org, acme@...nel.org, ak@...ux.intel.com,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [PATCH V5 02/16] perf, core: introduce pmu context switch
 callback

On Wed, Sep 10, 2014 at 10:08:59AM -0400, kan.liang@...el.com wrote:
> @@ -2446,6 +2499,9 @@ void __perf_event_task_sched_out(struct task_struct *task,
>  {
>  	int ctxn;
>  
> +	if (__get_cpu_var(perf_sched_cb_usages))
> +		perf_pmu_sched_task(task, next, false);
> +
>  	for_each_task_context_nr(ctxn)
>  		perf_event_context_sched_out(task, ctxn, next);
>  
> @@ -2703,6 +2759,9 @@ void __perf_event_task_sched_in(struct task_struct *prev,
>  	/* check for system-wide branch_stack events */
>  	if (atomic_read(&__get_cpu_var(perf_branch_stack_events)))
>  		perf_branch_stack_sched_in(prev, task);
> +
> +	if (__get_cpu_var(perf_sched_cb_usages))
> +		perf_pmu_sched_task(prev, task, true);
>  }
>  

I think the general idea was to get rid of __get_cpu_var() and co,
please consider using __this_cpu_read().
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