From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Minchan Kim <minchan@kernel.org>, Mel Gorman <mgorman@suse.de>,
Michal Nazarewicz <mina86@mina86.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
David Rientjes <rientjes@google.com>
Subject: Re: [PATCH 5/6] mm, compaction: skip compound pages by order in free scanner
Date: Tue, 16 Jun 2015 14:45:06 +0900 [thread overview]
Message-ID: <20150616054505.GE12641@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <1433928754-966-6-git-send-email-vbabka@suse.cz>
On Wed, Jun 10, 2015 at 11:32:33AM +0200, Vlastimil Babka wrote:
> The compaction free scanner is looking for PageBuddy() pages and skipping all
> others. For large compound pages such as THP or hugetlbfs, we can save a lot
> of iterations if we skip them at once using their compound_order(). This is
> generally unsafe and we can read a bogus value of order due to a race, but if
> we are careful, the only danger is skipping too much.
>
> When tested with stress-highalloc from mmtests on 4GB system with 1GB hugetlbfs
> pages, the vmstat compact_free_scanned count decreased by at least 15%.
>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Thanks.
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next prev parent reply other threads:[~2015-06-16 5:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 9:32 [PATCH 0/6] Assorted compaction cleanups and optimizations Vlastimil Babka
2015-06-10 9:32 ` [PATCH 1/6] mm, compaction: more robust check for scanners meeting Vlastimil Babka
2015-06-10 18:02 ` Rik van Riel
2015-06-12 9:55 ` Michal Nazarewicz
2015-06-16 5:37 ` Joonsoo Kim
2015-06-19 13:41 ` Mel Gorman
2015-06-10 9:32 ` [PATCH 2/6] mm, compaction: simplify handling restart position in free pages scanner Vlastimil Babka
2015-06-16 5:38 ` Joonsoo Kim
2015-06-19 13:48 ` Mel Gorman
2015-06-10 9:32 ` [PATCH 3/6] mm, compaction: encapsulate resetting cached scanner positions Vlastimil Babka
2015-06-12 10:07 ` Michal Nazarewicz
2015-06-16 5:41 ` Joonsoo Kim
2015-06-16 12:13 ` Vlastimil Babka
2015-06-10 9:32 ` [PATCH 4/6] mm, compaction: always skip compound pages by order in migrate scanner Vlastimil Babka
2015-06-12 10:11 ` Michal Nazarewicz
2015-06-16 5:44 ` Joonsoo Kim
2015-06-16 12:16 ` Vlastimil Babka
2015-06-19 13:58 ` Mel Gorman
2015-06-10 9:32 ` [PATCH 5/6] mm, compaction: skip compound pages by order in free scanner Vlastimil Babka
2015-06-12 10:18 ` Michal Nazarewicz
2015-06-16 5:45 ` Joonsoo Kim [this message]
2015-06-10 9:32 ` [PATCH 6/6] mm, compaction: decouple updating pageblock_skip and cached pfn Vlastimil Babka
2015-06-16 6:10 ` Joonsoo Kim
2015-06-16 12:33 ` Vlastimil Babka
2015-06-16 13:03 ` Joonsoo Kim
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