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: <a0ea7cd2-d66c-f251-d14f-979e0913c7ef@redhat.com>
Date:   Fri, 19 Jul 2019 10:07:20 -0400
From:   Waiman Long <longman@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
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 7/19/19 2:14 AM, Michal Hocko wrote:
> 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?

That is true, but it will be a bit more cumbersome to get the data.
Anyway, this is just a nice to have patch for me. I am perfectly fine
with dropping it if this does not prove to be that useful.

Thanks,
Longman