linux-kernel - Re: [RFC] a question about stack size form /proc/pid/task/child pid/limits

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Message-ID: <780b9e4e-7405-2266-a589-17a182d7c7da@redhat.com>
Date:   Mon, 27 Nov 2017 12:33:18 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Xishi Qiu <qiuxishi@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Cc:     zhong jiang <zhongjiang@...wei.com>
Subject: Re: [RFC] a question about stack size form /proc/pid/task/child
 pid/limits

On 09/06/2017 04:14 AM, Xishi Qiu wrote:
> Hi, I find if I use a defined stack size to create a child thread,
> then the max stack size from /proc/pid/task/child pid/limits still
> shows "Max stack size            8388608", it doesn't update to
> the user defined size, is it a problem?

This reflects the maximum stack size of the main thread after execve. 
The size of the stack of the current thread is a separate matter; it can 
be located anywhere in the process image and much smaller or larger than 
the maximum size of the initial stack of the main thread.

Thanks,
Florian