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From: Matthew Wilcox <willy@infradead.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>, Hugh Dickins <hughd@google.com>,
	Zhou Guanghui <zhouguanghui1@huawei.com>, Zi Yan <ziy@nvidia.com>,
	Shakeel Butt <shakeelb@google.com>, Roman Gushchin <guro@fb.com>,
	linux-mm@kvack.org, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH] mm: page_alloc: fix memcg accounting leak in speculative cache lookup
Date: Fri, 19 Mar 2021 13:21:37 +0000	[thread overview]
Message-ID: <20210319132137.GZ3420@casper.infradead.org> (raw)
In-Reply-To: <20210319071547.60973-1-hannes@cmpxchg.org>

On Fri, Mar 19, 2021 at 03:15:47AM -0400, Johannes Weiner wrote:
> When the freeing of a higher-order page block (non-compound) races
> with a speculative page cache lookup, __free_pages() needs to leave
> the first order-0 page in the chunk to the lookup but free the buddy
> pages that the lookup doesn't know about separately.

Thanks.


  reply	other threads:[~2021-03-19 13:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-19  7:15 [PATCH] mm: page_alloc: fix memcg accounting leak in speculative cache lookup Johannes Weiner
2021-03-19 13:21 ` Matthew Wilcox [this message]
2021-03-20  1:52 ` Hugh Dickins
2021-03-20  3:25   ` Matthew Wilcox
2021-03-23 19:02   ` Johannes Weiner
2021-03-23 19:12     ` Matthew Wilcox
2021-03-23 20:10     ` Hugh Dickins
2021-03-26  1:55       ` Hugh Dickins
2021-03-26  2:51         ` Matthew Wilcox
2021-03-26  4:04           ` Hugh Dickins
2021-03-26 12:07             ` Matthew Wilcox
2021-03-24  8:58     ` Michal Hocko
2021-03-22  9:55 ` Michal Hocko

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