linux-kernel - Re: [PATCH v1] proc: limit schedstate node write operation

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Message-ID: <YmNs+i/unWKvj4Kx@casper.infradead.org>
Date:   Sat, 23 Apr 2022 04:05:30 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Junwen Wu <wudaemon@....com>
Cc:     akpm@...ux-foundation.org, keescook@...omium.org,
        adobriyan@...il.com, fweimer@...hat.com, ddiss@...e.de,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v1] proc: limit schedstate node write operation

On Sat, Apr 23, 2022 at 02:31:04AM +0000, Junwen Wu wrote:
> Whatever value is written to /proc/$pid/sched, a task's schedstate data
> will reset.In some cases, schedstate will drop by accident. We restrict
> writing a certain value to this node before the data is reset.

... and break the existing scripts which expect the current behaviour.