linux-kernel - Re: [PATCH v2 0/3] Directed kmem charging

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Message-ID: <alpine.DEB.2.20.1802211002200.12567@nuc-kabylake>
Date:   Wed, 21 Feb 2018 10:09:53 -0600 (CST)
From:   Christopher Lameter <cl@...ux.com>
To:     Shakeel Butt <shakeelb@...gle.com>
cc:     Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Directed kmem charging

Another way to solve this is to switch the user context right?

Isnt it possible to avoid these patches if do the allocation in another
task context instead?

Are there really any other use cases beyond fsnotify?

The charging of the memory works on a per page level but the allocation
occur from the same page for multiple tasks that may be running on a
system. So how relevant is this for other small objects?

Seems that if you do a large amount of allocations for the same purpose
your chance of accounting it to the right memcg increases. But this is a
game of chance.