From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@kernel.org>,
Mel Gorman <mgorman@techsingularity.net>,
David Rientjes <rientjes@google.com>,
Rik van Riel <riel@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 10/11] mm, compaction: require only min watermarks for non-costly orders
Date: Tue, 16 Aug 2016 15:46:31 +0900 [thread overview]
Message-ID: <20160816064630.GH17448@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <484d17e5-7294-4724-f5f9-0a15167d47ee@suse.cz>
On Tue, Aug 16, 2016 at 08:36:12AM +0200, Vlastimil Babka wrote:
> On 08/16/2016 08:16 AM, Joonsoo Kim wrote:
> >On Wed, Aug 10, 2016 at 11:12:25AM +0200, Vlastimil Babka wrote:
> >>diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> >>index 621e4211ce16..a5c0f914ec00 100644
> >>--- a/mm/page_alloc.c
> >>+++ b/mm/page_alloc.c
> >>@@ -2492,7 +2492,7 @@ int __isolate_free_page(struct page *page, unsigned int order)
> >>
> >> if (!is_migrate_isolate(mt)) {
> >> /* Obey watermarks as if the page was being allocated */
> >>- watermark = low_wmark_pages(zone) + (1 << order);
> >>+ watermark = min_wmark_pages(zone) + (1UL << order);
> >
> >This '1 << order' also needs some comment. Why can't we use
> >compact_gap() in this case?
>
> This is just short-cutting the high-order watermark check to check
> only order-0, because we already know the high-order page exists.
> We can't use compact_gap() as that's too high to use for a single
> allocation watermark, since we can be already holding some free
> pages on the list. So it would defeat the gap purpose.
Oops. I missed that. Thanks for clarifying it.
Thanks.
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next prev parent reply other threads:[~2016-08-16 6:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-10 9:12 [PATCH v6 00/11] make direct compaction more deterministic Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 01/11] mm, compaction: make whole_zone flag ignore cached scanner positions Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 02/11] mm, compaction: cleanup unused functions Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 03/11] mm, compaction: rename COMPACT_PARTIAL to COMPACT_SUCCESS Vlastimil Babka
2016-08-18 9:01 ` Michal Hocko
2016-08-10 9:12 ` [PATCH v6 04/11] mm, compaction: don't recheck watermarks after COMPACT_SUCCESS Vlastimil Babka
2016-08-16 6:12 ` Joonsoo Kim
2016-08-16 6:11 ` Vlastimil Babka
2016-08-18 11:59 ` Vlastimil Babka
2016-08-18 9:03 ` Michal Hocko
2016-08-10 9:12 ` [PATCH v6 05/11] mm, compaction: add the ultimate direct compaction priority Vlastimil Babka
2016-08-16 5:58 ` Joonsoo Kim
2016-08-18 12:23 ` Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 06/11] mm, compaction: more reliably increase " Vlastimil Babka
2016-08-16 6:07 ` Joonsoo Kim
2016-08-16 6:31 ` Vlastimil Babka
2016-08-18 9:10 ` Michal Hocko
2016-08-18 9:44 ` Vlastimil Babka
2016-08-18 9:48 ` Michal Hocko
2016-08-10 9:12 ` [PATCH v6 07/11] mm, compaction: use correct watermark when checking compaction success Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 08/11] mm, compaction: create compact_gap wrapper Vlastimil Babka
2016-08-16 6:15 ` Joonsoo Kim
2016-08-16 6:15 ` Vlastimil Babka
2016-08-16 6:41 ` Joonsoo Kim
2016-08-18 12:13 ` Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 09/11] mm, compaction: use proper alloc_flags in __compaction_suitable() Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 10/11] mm, compaction: require only min watermarks for non-costly orders Vlastimil Babka
2016-08-16 6:16 ` Joonsoo Kim
2016-08-16 6:36 ` Vlastimil Babka
2016-08-16 6:46 ` Joonsoo Kim [this message]
2016-08-18 12:20 ` Vlastimil Babka
2016-08-10 9:12 ` [PATCH v6 11/11] mm, vmscan: make compaction_ready() more accurate and readable Vlastimil Babka
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