linux-kernel - Re: [PATCH v6] perf sched timehist: Add pre-migration wait time option

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Message-Id: <172909876202.288721.13527604855301602409.b4-ty@kernel.org>
Date: Wed, 16 Oct 2024 10:12:42 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, 
 Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Kan Liang <kan.liang@...ux.intel.com>, acme@...hat.com, 
 Tim Chen <tim.c.chen@...ux.intel.com>, 
 linux-perf-users <linux-perf-users@...r.kernel.org>, 
 LKML <linux-kernel@...r.kernel.org>, 
 Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
Subject: Re: [PATCH v6] perf sched timehist: Add pre-migration wait time
 option

On Fri, 04 Oct 2024 22:37:56 +0530, Madadi Vineeth Reddy wrote:

> pre-migration wait time is the time that a task unnecessarily spends
> on the runqueue of a CPU but doesn't get switched-in there. In terms
> of tracepoints, it is the time between sched:sched_wakeup and
> sched:sched_migrate_task.
> 
> Let's say a task woke up on CPU2, then it got migrated to CPU4 and
> then it's switched-in to CPU4. So, here pre-migration wait time is
> time that it was waiting on runqueue of CPU2 after it is woken up.
> 
> [...]

Applied to perf-tools-next, thanks!

Best regards,
Namhyung