linux-kernel - Re: [PATCH bpf-next v8 1/3] perf: Add rctx in perf_callchain

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Message-ID: <00fd7c67-dffa-4647-8370-59a195a41deb@linux.dev>
Date: Thu, 29 Jan 2026 00:52:52 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: Peter Zijlstra <peterz@...radead.org>
Cc: mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
 mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
 irogers@...gle.com, adrian.hunter@...el.com, kan.liang@...ux.intel.com,
 song@...nel.org, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, yonghong.song@...ux.dev,
 john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next v8 1/3] perf: Add rctx in perf_callchain_entry

在 2026/1/28 16:59, Peter Zijlstra 写道:
> On Mon, Jan 26, 2026 at 03:43:29PM +0800, Tao Chen wrote:
>> Record rctx inside the perf_callchain_entry itself, when callers of
>> get_callchain_entry no longer care about the assignment of rctx, and
>> will be used in the next patch.
> 
> Sorry, what?
> 
> The recursion context is very much about the caller, and very much not
> about the data. This just doesn't make sense.

Well, Andrii, it seems we have to go back to the original way.

-- 
Best Regards
Tao Chen