From: Vlastimil Babka <vbabka@suse.cz>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kernel-team@fb.com
Subject: Re: [RFC 4/4] mm, page_alloc: disallow migratetype fallback in fastpath
Date: Wed, 12 Oct 2016 16:51:48 +0200 [thread overview]
Message-ID: <b80f63d4-f2d3-b73c-c7f8-5340e81ea6f5@suse.cz> (raw)
In-Reply-To: <20160929210548.26196-5-vbabka@suse.cz>
On 09/29/2016 11:05 PM, Vlastimil Babka wrote:
> The previous patch has adjusted async compaction so that it helps against
> longterm fragmentation when compacting for a non-MOVABLE high-order allocation.
> The goal of this patch is to force such allocations go through compaction
> once before being allowed to fallback to a pageblock of different migratetype
> (e.g. MOVABLE). In contexts where compaction is not allowed (and for order-0
> allocations), this delayed fallback possibility can still help by trying a
> different zone where fallback might not be needed and potentially waking up
> kswapd earlier.
>
> Not-yet-signed-off-by: Vlastimil Babka <vbabka@suse.cz>
I forgot that compaction itself also needs to be told to not allow fallback,
otherwise it finishes with COMPACT_SUCCESS without actually doing anything...
next prev parent reply other threads:[~2016-10-12 14:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-28 1:41 Regression in mobility grouping? Johannes Weiner
2016-09-28 9:00 ` Vlastimil Babka
2016-09-28 15:39 ` Johannes Weiner
2016-09-29 2:25 ` Johannes Weiner
2016-09-29 6:14 ` Joonsoo Kim
2016-09-29 16:14 ` Johannes Weiner
2016-10-13 7:33 ` Joonsoo Kim
2016-09-29 7:17 ` Vlastimil Babka
2016-09-28 10:26 ` Mel Gorman
2016-09-28 16:37 ` Johannes Weiner
2016-09-29 21:05 ` [RFC 0/4] try to reduce fragmenting fallbacks Vlastimil Babka
2016-09-29 21:05 ` [RFC 1/4] mm, compaction: change migrate_async_suitable() to suitable_migration_source() Vlastimil Babka
2016-09-29 21:05 ` [RFC 2/4] mm, compaction: add migratetype to compact_control Vlastimil Babka
2016-09-29 21:05 ` [RFC 3/4] mm, compaction: restrict async compaction to matching migratetype Vlastimil Babka
2016-09-29 21:05 ` [RFC 4/4] mm, page_alloc: disallow migratetype fallback in fastpath Vlastimil Babka
2016-10-12 14:51 ` Vlastimil Babka [this message]
2016-10-13 7:58 ` Joonsoo Kim
2016-10-13 11:46 ` Vlastimil Babka
2016-10-07 8:32 ` [RFC 5/4] mm, page_alloc: split smallest stolen page in fallback Vlastimil Babka
2016-10-10 17:16 ` [RFC 0/4] try to reduce fragmenting fallbacks Johannes Weiner
2016-10-11 13:11 ` [RFC 6/4] mm, page_alloc: introduce MIGRATE_MIXED migratetype Vlastimil Babka
2016-10-13 14:11 ` [RFC 7/4] mm, page_alloc: count movable pages when stealing Vlastimil Babka
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