linux-kernel - Re: [PATCH v3 4/8] memcg: reduce memory for the lruvec and memcg stats

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Date: Tue, 30 Apr 2024 10:45:06 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: "T.J. Mercier" <tjmercier@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Muchun Song <muchun.song@...ux.dev>, 
	Yosry Ahmed <yosryahmed@...gle.com>, kernel-team@...a.com, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/8] memcg: reduce memory for the lruvec and memcg
 stats

On Tue, Apr 30, 2024 at 10:30:51AM -0700, T.J. Mercier wrote:
> On Mon, Apr 29, 2024 at 11:06 PM Shakeel Butt <shakeel.butt@...ux.dev> wrote:
> >
> > +
> > +static inline int memcg_stats_index(int idx)
> > +{
> > +       return mem_cgroup_stats_index[idx] - 1;
> 
> Could this just be: return mem_cgroup_stats_index[idx];
> with a postfix increment of j in init_memcg_stats instead of prefix increment?
> 

The -1 is basically for error checking but I will do a followup patch to
initialize the array/indirection-table with -1 and remove the
subtraction from the fast path.

Thanks for the review.