linux-kernel - Re: [PATCH v2 5/6] mm: memcg/slab: cache page number in memcg_(un)charge

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Message-ID: <20200116172659.GE57074@cmpxchg.org>
Date:   Thu, 16 Jan 2020 12:26:59 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v2 5/6] mm: memcg/slab: cache page number in
 memcg_(un)charge_slab()

On Thu, Jan 09, 2020 at 12:26:58PM -0800, Roman Gushchin wrote:
> There are many places in memcg_charge_slab() and memcg_uncharge_slab()
> which are calculating the number of pages to charge, css references to
> grab etc depending on the order of the slab page.
> 
> Let's simplify the code by calculating it once and caching in the
> local variable.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

Acked-by: Johannes Weiner <hannes@...xchg.org>