linux-kernel - Re: [PATCH 5/5] mm: compaction: drop redundant watermark check in compaction_zonelist

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Message-ID: <c2226813-0aca-0597-a728-95792cbd3ff0@suse.cz>
Date:   Mon, 29 May 2023 19:12:58 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 5/5] mm: compaction: drop redundant watermark check in
 compaction_zonelist_suitable()

On 5/19/23 14:39, Johannes Weiner wrote:
> The watermark check in compaction_zonelist_suitable(), called from
> should_compact_retry(), is sandwiched between two watermark checks
> already: before, there are freelist attempts as part of direct reclaim
> and direct compaction; after, there is a last-minute freelist attempt
> in __alloc_pages_may_oom().
> 
> The check in compaction_zonelist_suitable() isn't necessary. Kill it.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz>