From: Vlastimil Babka <vbabka@suse.cz>
To: Baolin Wang <baolin.wang@linux.alibaba.com>, akpm@linux-foundation.org
Cc: mgorman@techsingularity.net, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 6/6] mm: compaction: skip fast freepages isolation if enough freepages are isolated
Date: Tue, 30 May 2023 10:32:04 +0200 [thread overview]
Message-ID: <efc76ea3-9a85-96a3-f3d7-212aeea7cf1c@suse.cz> (raw)
In-Reply-To: <f39c2c07f2dba2732fd9c0843572e5bef96f7f67.1685018752.git.baolin.wang@linux.alibaba.com>
On 5/25/23 14:54, Baolin Wang wrote:
> I've observed that fast isolation often isolates more pages than
> cc->migratepages, and the excess freepages will be released back to the
> buddy system. So skip fast freepages isolation if enough freepages are
> isolated to save some CPU cycles.
>
> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> mm/compaction.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index eccec84dae82..3ade4c095ed2 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1550,6 +1550,10 @@ static void fast_isolate_freepages(struct compact_control *cc)
>
> spin_unlock_irqrestore(&cc->zone->lock, flags);
>
> + /* Skip fast search if enough freepages isolated */
> + if (cc->nr_freepages >= cc->nr_migratepages)
> + break;
> +
> /*
> * Smaller scan on next order so the total scan is related
> * to freelist_scan_limit.
prev parent reply other threads:[~2023-05-30 8:32 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-25 12:53 [PATCH 0/6] Misc cleanups and improvements for compaction Baolin Wang
2023-05-25 12:53 ` [PATCH 1/6] mm: compaction: drop the redundant page validation in update_pageblock_skip() Baolin Wang
2023-05-30 7:27 ` Vlastimil Babka
2023-05-31 1:44 ` Baolin Wang
2023-05-25 12:53 ` [PATCH 2/6] mm: compaction: change fast_isolate_freepages() to void type Baolin Wang
2023-05-30 7:29 ` Vlastimil Babka
2023-05-25 12:53 ` [PATCH 3/6] mm: compaction: skip more fully scanned pageblock Baolin Wang
2023-05-30 7:59 ` Vlastimil Babka
2023-05-25 12:53 ` [PATCH 4/6] mm: compaction: only set skip flag if cc->no_set_skip_hint is false Baolin Wang
2023-05-30 8:03 ` Vlastimil Babka
2023-05-25 12:54 ` [PATCH 5/6] mm: compaction: add trace event for fast freepages isolation Baolin Wang
2023-05-30 8:24 ` Vlastimil Babka
2023-05-25 12:54 ` [PATCH 6/6] mm: compaction: skip fast freepages isolation if enough freepages are isolated Baolin Wang
2023-05-30 8:32 ` Vlastimil Babka [this message]
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