linux-kernel - Re: [PATCH v2 6/7] mm/compaction: improve comment of is_via_compact

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Date:   Tue, 29 Aug 2023 11:28:24 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, david@...hat.com, willy@...radead.org
Subject: Re: [PATCH v2 6/7] mm/compaction: improve comment of
 is_via_compact_memory



On 8/26/2023 11:36 PM, Kemeng Shi wrote:
> We do proactive compaction with order == -1 via
> 1. /proc/sys/vm/compact_memory
> 2. /sys/devices/system/node/nodex/compact
> 3. /proc/sys/vm/compaction_proactiveness
> Add missed situation in which order == -1.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   mm/compaction.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 89a1b627bc89..00b7bba6c72e 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -2061,8 +2061,10 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
>   }
>   
>   /*
> - * order == -1 is expected when compacting via
> - * /proc/sys/vm/compact_memory
> + * order == -1 is expected when compacting proactively via
> + * 1. /proc/sys/vm/compact_memory
> + * 2. /sys/devices/system/node/nodex/compact
> + * 3. /proc/sys/vm/compaction_proactiveness
>    */
>   static inline bool is_via_compact_memory(int order)
>   {