linux-kernel - Re: [PATCH] mm: /proc/pid/smaps_rollup: avoid skipping vma after getting mmap

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Message-Id: <20240523200228.fdaa0319d3fd4bd7a62f7f8a@linux-foundation.org>
Date: Thu, 23 May 2024 20:02:28 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Yuanyuan Zhong <yzhong@...estorage.com>
Cc: David Hildenbrand <david@...hat.com>, Matthew Wilcox
 <willy@...radead.org>, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, Mohamed Khalfella
 <mkhalfella@...estorage.com>
Subject: Re: [PATCH] mm: /proc/pid/smaps_rollup: avoid skipping vma after
 getting mmap_lock again

On Thu, 23 May 2024 12:16:57 -0700 Yuanyuan Zhong <yzhong@...estorage.com> wrote:

> On Thu, May 23, 2024 at 11:56 AM Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> >
> > Please describe the userspace-visible runtime effects of this bug.
> > This aids others in deciding which kernel version(s) need the patch.
> >
> Otherwise, with some VMAs skipped, userspace observed memory consumption
> from /proc/pid/smaps_rollup will be smaller than the sum of the
> corresponding fields from /proc/pid/smaps.
> 
> Please let me know if separate v2 is needed. Thanks

All is good, thanks.  I added the above text and the cc:stable tag.