linux-kernel - Re: [RFC PATCH] zsmalloc: make common caches global

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Message-ID: <zfmvd2oogwtx6mbavyjgwxralsvrd576ye6jnscfwvqy4u4ayp@q7qpxnyaxb6f>
Date: Fri, 16 Jan 2026 14:52:54 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, Minchan Kim <minchan@...nel.org>, Nhat Pham <nphamcs@...il.com>, 
	Johannes Weiner <hannes@...xchg.org>, Brian Geffon <bgeffon@...gle.com>, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org
Subject: Re: [RFC PATCH] zsmalloc: make common caches global

On (26/01/16 13:48), Sergey Senozhatsky wrote:
> Currently, zsmalloc creates kmem_cache of handles and zspages
> for each pool, which may be suboptimal from the memory usage
> point of view (extra internal fragmentation per pool).  Systems
> that create multiple zsmalloc pools may benefit from shared
> common zsmalloc caches.

This is step 1.

Step 2 is to look into possibility of sharing zsmalloc pools.
E.g. if there are N zram devices in the system, do we really need
N zsmalloc pools?  Can we just share a single pool between them?