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: <0100016c04e1562a-e516c595-1d46-40df-ab29-da1709277e9a-000000@email.amazonses.com>
Date:   Thu, 18 Jul 2019 11:39:32 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Waiman Long <longman@...hat.com>
cc:     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, Michal Hocko <mhocko@...nel.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 Jul 2019, 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.

What is this useful for? Any use cases?

> CONFIG_SLUB_DEBUG depends on CONFIG_SYSFS. So the new shrink_us field
> is always available to the shrink methods.

Aside from minimal systems without CONFIG_SYSFS... Does this build without
CONFIG_SYSFS?