linux-kernel - Re: [PATCH v3 1/4] fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache

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Message-ID: <20180911220224.GE5631@dastard>
Date:   Wed, 12 Sep 2018 08:02:24 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Larry Woodman <lwoodman@...hat.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        "Wangkai (Kevin C)" <wangkai86@...wei.com>,
        Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH v3 1/4] fs/dcache: Fix incorrect nr_dentry_unused
 accounting in shrink_dcache_sb()

On Tue, Sep 11, 2018 at 03:18:23PM -0400, Waiman Long wrote:
> The nr_dentry_unused per-cpu counter tracks dentries in both the
> LRU lists and the shrink lists where the DCACHE_LRU_LIST bit is set.
> The shrink_dcache_sb() function moves dentries from the LRU list to a
> shrink list and subtracts the dentry count from nr_dentry_unused. This
> is incorrect as the nr_dentry_unused count Will also be decremented in
> shrink_dentry_list() via d_shrink_del(). To fix this double decrement,
> the decrement in the shrink_dcache_sb() function is taken out.
> 
> Fixes: 4e717f5c1083 ("list_lru: remove special case function list_lru_dispose_all."
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

Please add a stable tag for this.

Otherwise looks fine.

Reviewed-by: Dave Chinner <dchinner@...hat.com>

-- 
Dave Chinner
david@...morbit.com