linux-kernel - Re: [PATCH] zsmalloc: reset compaction source zspage pointer after putback

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Date:   Mon, 17 Apr 2023 04:43:04 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>, Minchan Kim <minchan@...nel.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] zsmalloc: reset compaction source zspage pointer after putback_zspage()

Hi Sergey,

On Sun, Apr 16, 2023 at 10:01 PM Sergey Senozhatsky
<senozhatsky@...omium.org> wrote:
>
> Fixup.

I think the original patch landed in mm-stable already, so we might
want a proper commit log and fixes tag.

I suspect we want:
Fixes: 5a845e9f2d66 ("zsmalloc: rework compaction algorithm")

>
> Reported-by: Yu Zhao <yuzhao@...gle.com>
> Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>

Otherwise, LGTM.

Reviewed-by: Yosry Ahmed <yosryahmed@...gle.com>

> ---
>  mm/zsmalloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index aea50e2aa350..cc81dfba05a0 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -2239,8 +2239,8 @@ static unsigned long __zs_compact(struct zs_pool *pool,
>                 if (fg == ZS_INUSE_RATIO_0) {
>                         free_zspage(pool, class, src_zspage);
>                         pages_freed += class->pages_per_zspage;
> -                       src_zspage = NULL;
>                 }
> +               src_zspage = NULL;
>
>                 if (get_fullness_group(class, dst_zspage) == ZS_INUSE_RATIO_100
>                     || spin_is_contended(&pool->lock)) {
> --
> 2.40.0.634.g4ca3ef3211-goog
>