linux-kernel - Re: [PATCH] RFC: dm: avoid the mutex lock in dm_bufio_shrink

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Message-ID: <alpine.DEB.2.10.1611281656020.107214@chino.kir.corp.google.com>
Date:   Mon, 28 Nov 2016 16:56:18 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Mikulas Patocka <mpatocka@...hat.com>
cc:     Douglas Anderson <dianders@...omium.org>,
        Mike Snitzer <snitzer@...hat.com>, shli@...nel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        dm-devel@...hat.com, linux@...ck-us.net,
        Sonny Rao <sonnyrao@...omium.org>,
        Alasdair Kergon <agk@...hat.com>
Subject: Re: [PATCH] RFC: dm: avoid the mutex lock in
 dm_bufio_shrink_count()

On Wed, 23 Nov 2016, Mikulas Patocka wrote:

> From: Mikulas Patocka <mpatocka@...hat.com>
> 
> dm-bufio: don't take the lock in dm_bufio_shrink_count
> 
> dm_bufio_shrink_count is called from do_shrink_slab to find out how many
> freeable objects are there. The reported value doesn't have to be precise,
> so we don't need to take the dm-bufio lock.
> 
> Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>

Acked-by: David Rientjes <rientjes@...gle.com>