linux-kernel - Re: [PATCH v3 0/5] Implement writeback for zsmalloc

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Message-ID: <Y2q/723tli9PQUBV@cmpxchg.org>
Date:   Tue, 8 Nov 2022 15:45:35 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Nhat Pham <nphamcs@...il.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, minchan@...nel.org,
        ngupta@...are.org, senozhatsky@...omium.org, sjenning@...hat.com,
        ddstreet@...e.org, vitaly.wool@...sulko.com
Subject: Re: [PATCH v3 0/5] Implement writeback for zsmalloc

On Tue, Nov 08, 2022 at 11:32:02AM -0800, Nhat Pham wrote:
> Changelog:
> v3:
>   * Set pool->ops = NULL when pool->zpool_ops is null (patch 4).
>   * Stop holding pool's lock when calling lock_zspage() (patch 5).
>     (suggested by Sergey Senozhatsky)
>   * Stop holding pool's lock when checking pool->ops and retries.
>     (patch 5) (suggested by Sergey Senozhatsky)
>   * Fix formatting issues (.shrink, extra spaces in casting removed).
>     (patch 5) (suggested by Sergey Senozhatsky)
> 
> v2:
>   * Add missing CONFIG_ZPOOL ifdefs (patch 5)
>     (detected by kernel test robot).
> 
> Unlike other zswap's allocators such as zbud or z3fold, zsmalloc
> currently lacks the writeback mechanism. This means that when the zswap
> pool is full, it will simply reject further allocations, and the pages
> will be written directly to swap.
> 
> This series of patches implements writeback for zsmalloc. When the zswap
> pool becomes full, zsmalloc will attempt to evict all the compressed
> objects in the least-recently used zspages.
> 
> There are 5 patches in this series:

For the series:

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