linux-kernel - Re: [PATCH v2 1/7] memcg: reduce memory size of mem_cgroup_events

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Message-ID: <Zi--bEqvwJHXqTLL@P9FQF9L96D>
Date: Mon, 29 Apr 2024 08:36:12 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] memcg: reduce memory size of
 mem_cgroup_events_index

On Fri, Apr 26, 2024 at 05:37:27PM -0700, Shakeel Butt wrote:
> mem_cgroup_events_index is a translation table to get the right index of
> the memcg relevant entry for the general vm_event_item. At the moment,
> it is defined as integer array. However on a typical system the max
> entry of vm_event_item (NR_VM_EVENT_ITEMS) is 113, so we don't need to
> use int as storage type of the array. For now just use int8_t as type
> and add a BUILD_BUG_ON() and will switch to short once NR_VM_EVENT_ITEMS
> touches 127.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>