linux-kernel - Re: [PATCH] zswap: change zswap's default allocator to zsmalloc

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Message-ID: <ZRKIRyYYkAbJ5uOP@infradead.org>
Date:   Tue, 26 Sep 2023 00:29:11 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Nhat Pham <nphamcs@...il.com>
Cc:     akpm@...ux-foundation.org, hannes@...xchg.org,
        cerasuolodomenico@...il.com, yosryahmed@...gle.com,
        sjenning@...hat.com, ddstreet@...e.org, vitaly.wool@...sulko.com,
        linux-mm@...ck.org, kernel-team@...a.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zswap: change zswap's default allocator to zsmalloc

On Fri, Sep 08, 2023 at 04:51:15PM -0700, Nhat Pham wrote:
> Out of zswap's 3 allocators, zsmalloc is the clear superior in terms of
> memory utilization, both in theory and as observed in practice, with its
> high storage density and low internal fragmentation. zsmalloc is also
> more actively developed and maintained, since it is the allocator of
> choice for zswap for many users, as well as the only allocator for zram.

Dumb question from an outside, why do we then even keep the other
two allocators around?