linux-kernel - Re: [PATCH] mm: page_alloc: fix memcg accounting leak in speculative cache lookup

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Date:   Fri, 19 Mar 2021 13:21:37 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Hugh Dickins <hughd@...gle.com>,
        Zhou Guanghui <zhouguanghui1@...wei.com>,
        Zi Yan <ziy@...dia.com>, Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <guro@...com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH] mm: page_alloc: fix memcg accounting leak in speculative
 cache lookup

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.