linux-kernel - Re: [PATCH v2 2/2] mm, slab: Show last shrink time in us when slab/shrink is read

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Message-ID: <20190719061410.GJ30461@dhcp22.suse.cz>
Date:   Fri, 19 Jul 2019 08:14:10 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Roman Gushchin <guro@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>
Subject: Re: [PATCH v2 2/2] mm, slab: Show last shrink time in us when
 slab/shrink is read

On Wed 17-07-19 16:24:13, Waiman Long wrote:
> The show method of /sys/kernel/slab/<slab>/shrink sysfs file currently
> returns nothing. This is now modified to show the time of the last
> cache shrink operation in us.

Isn't this something that tracing can be used for without any kernel
modifications?
-- 
Michal Hocko
SUSE Labs