linux-kernel - Re: [PATCH] mm/slub: Detach node lock from counting free objects

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Message-ID: <alpine.DEB.2.21.2002082138070.21534@www.lameter.com>
Date:   Sat, 8 Feb 2020 21:41:49 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Wen Yang <wenyang@...ux.alibaba.com>
cc:     Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Xunlei Pang <xlpang@...ux.alibaba.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: Detach node lock from counting free objects

On Sat, 8 Feb 2020, Wen Yang wrote:

> I would greatly appreciate it if you kindly give me some feedback on this
> patch.

I think the measure is too severe given its use and the general impact on code.

Maybe avoid taking the lock or reducing the time a lock is taken when reading /proc/slabinfo is
the best approach?

Also you could cache the value in the userspace application? Why is this
value read continually?