linux-kernel - Re: [PATCH] memcg: set page->private before calling swap

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Message-ID: <YFNrrlPBmdgdanH1@cmpxchg.org>
Date:   Thu, 18 Mar 2021 11:03:10 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Hugh Dickins <hughd@...gle.com>, Roman Gushchin <guro@...com>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Minchan Kim <minchan@...nel.org>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: Re: [PATCH] memcg: set page->private before calling swap_readpage

On Wed, Mar 17, 2021 at 06:59:59PM -0700, Shakeel Butt wrote:
> The function swap_readpage() (and other functions it call) extracts swap
> entry from page->private. However for SWP_SYNCHRONOUS_IO, the kernel
> skips the swapcache and thus we need to manually set the page->private
> with the swap entry before calling swap_readpage().
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> Reported-by: Heiko Carstens <hca@...ux.ibm.com>

LGTM