linux-kernel - Re: [PATCH RFC 1/3] perf/core: add logic to collect off-cpu sample

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Message-ID: <20240711214936.GH27299@noisy.programming.kicks-ass.net>
Date: Thu, 11 Jul 2024 23:49:36 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Ajay Kaher <ajay.kaher@...adcom.com>
Cc: mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
	mark.rutland@....com, rostedt@...dmis.org,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
	irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, yangjihong1@...wei.com,
	zegao2021@...il.com, leo.yan@...ux.dev, asmadeus@...ewreck.org,
	siyanteng@...ngson.cn, sunhaiyong@...ngson.cn,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	alexey.makhalov@...adcom.com, vasavi.sirnapalli@...adcom.com
Subject: Re: [PATCH RFC 1/3] perf/core: add logic to collect off-cpu sample

On Thu, Jul 11, 2024 at 05:46:17PM +0530, Ajay Kaher wrote:
> following logics has been added to collect the off-cpu sample:
> 
> - 'task_pt_regs(current)' has been used to capture registers
>   status off-cpu sample.
> 
> - off-cpu time represent the time period for which the target
>   process not occupying the cpu cycles. And calculate as:
> 
>   off-cpu time = swap-in time - swap-out time
> 

I have absolutely no idea what you're trying to do :/ The above does not
constitute a comprehensible Changelog.