From: Alexey Budankov <alexey.budankov@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v2 0/3] perf/core: expose thread context switch out event type to user space
Date: Fri, 23 Mar 2018 23:38:03 +0300 [thread overview]
Message-ID: <c727a309-6fe5-22ac-0072-30724127166b@linux.intel.com> (raw)
In-Reply-To: <20180323180534.GD4043@hirez.programming.kicks-ass.net>
On 23.03.2018 21:05, Peter Zijlstra wrote:
> On Thu, Mar 22, 2018 at 07:08:25PM +0300, Alexey Budankov wrote:
>>
>> Implementation of exposing context-switch-out type event as a part
>> of PERF_RECORD_SWITCH[_CPU_WIDE] record.
>>
>> Introduced types of events assumed to be:
>> a) preempt: when task->state == TASK_RUNNING
>> b) yield: !preempt, encoding is done using new bit
>> PERF_RECORD_MISC_SWITCH_OUT_YIELD like this:
>
> A !preempt context switch isn't nessecarily a yield; please don't use
> that name, it means something quite specific and this isn't it.
>
> Specifically, on Linux yield() doesn't actually change task->state, so
> when task->state is set !0 it _cannot_ have been yield.
>
> I would invert the thing and call the preempt one SWITCH_OUT_PREEMPT.
>
Make sense. This way it names the thing exactly what it is.
Let me take care of that.
Thanks,
Alexey
prev parent reply other threads:[~2018-03-23 20:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-22 16:08 [PATCH v2 0/3] perf/core: expose thread context switch out event type to user space Alexey Budankov
2018-03-22 16:11 ` [PATCH v2 1/3] perf/core: store context switch out type into Perf trace Alexey Budankov
2018-03-22 16:13 ` [PATCH v1 2/3] perf report: extend raw dump (-D) out with switch out event type Alexey Budankov
2018-03-22 16:16 ` [PATCH v2 3/3] perf script: extend misc field decoding " Alexey Budankov
2018-03-23 9:24 ` [PATCH v2 0/3] perf/core: expose thread context switch out event type to user space Jiri Olsa
2018-03-23 18:05 ` Peter Zijlstra
2018-03-23 20:38 ` Alexey Budankov [this message]
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