linux-kernel - Re: [PATCH] sched/proc: Print user_cpus

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Message-ID: <20240429121000.GA40213@noisy.programming.kicks-ass.net>
Date: Mon, 29 Apr 2024 14:10:00 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Xuewen Yan <xuewen.yan@...soc.com>
Cc: akpm@...ux-foundation.org, oleg@...hat.com, longman@...hat.com,
	dylanbhatch@...gle.com, rick.p.edgecombe@...el.com,
	ke.wang@...soc.com, xuewen.yan94@...il.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] sched/proc: Print user_cpus_ptr for task status

On Mon, Apr 29, 2024 at 04:46:33PM +0800, Xuewen Yan wrote:
> The commit 851a723e45d1c("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()")
> would clear the user_cpus_ptr when call the do_set_cpus_allowed.
> 
> In order to determine whether the user_cpus_ptr is taking effect,
> it is better to print the task's user_cpus_ptr.

This is an ABI change and would mandate we forever more have this
distinction. I don't think your changes justifies things sufficiently
for this.