linux-kernel - Re: [PATCHv2 2/3] zsmalloc: move migration destination zspage inuse check

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Message-ID: <ZJnHVPifB6oFnYhl@google.com>
Date:   Mon, 26 Jun 2023 10:13:56 -0700
From:   Minchan Kim <minchan@...nel.org>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 2/3] zsmalloc: move migration destination zspage inuse
 check

On Sat, Jun 24, 2023 at 02:12:15PM +0900, Sergey Senozhatsky wrote:
> Destination zspage fullness check need to be done after
> zs_object_copy() because that's where source and destination
> zspages fullness change.  Checking destination zspage fullness
> before zs_object_copy() may cause migration to loop through
> source zspage sub-pages scanning for allocate objects just to
> find out at the end that the destination zspage is full.
> 
> Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Acked-by: Minchan Kim <minchan@...nel.org>