linux-kernel - Re: [PATCH v3 01/19] mm: memcg: factor out memcg- and lruvec-level changes out of __mod_lruvec

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Message-ID: <20200507203334.GA161043@cmpxchg.org>
Date:   Thu, 7 May 2020 16:33:34 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        kernel-team@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/19] mm: memcg: factor out memcg- and lruvec-level
 changes out of __mod_lruvec_state()

On Wed, Apr 22, 2020 at 01:46:50PM -0700, Roman Gushchin wrote:
> To convert memcg and lruvec slab counters to bytes there must be
> a way to change these counters without touching node counters.
> Factor out __mod_memcg_lruvec_state() out of __mod_lruvec_state().
> 
> Signed-off-by: Roman Gushchin <guro@...com>

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

Roman and I have talked a bunch about the function names here. They're
not optimal, with mod_lruvec_state() doing the entire intersection -
node, memcg, lruvec - and mod_memcg_lruvec_state() being a specific
version that does not update the node.

However, the usecases for mod_memcg_lruvec_state() are highly
specific, so the function won't be widely used. As such, it received
the longer name, and we get to keep the shorter mod_lruvec_state() for
the much more widely used function.