From: Mel Gorman <mgorman@techsingularity.net>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>,
Linux-FSDevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Jan Kara <jack@suse.cz>,
Andi Kleen <ak@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCH 8/8] mm: Remove __GFP_COLD
Date: Thu, 19 Oct 2017 15:32:52 +0100 [thread overview]
Message-ID: <20171019143252.bviqsb7qxppzz32j@techsingularity.net> (raw)
In-Reply-To: <f6505442-98a9-12e4-b2cd-0fa83874c159@suse.cz>
On Thu, Oct 19, 2017 at 03:42:12PM +0200, Vlastimil Babka wrote:
> From b002266c1a826805a50087db851f93e7a87ceb2f Mon Sep 17 00:00:00 2001
> From: Vlastimil Babka <vbabka@suse.cz>
> Date: Tue, 17 Oct 2017 16:03:02 +0200
> Subject: [PATCH] mm, page_alloc: simplify list handling in rmqueue_bulk()
>
> The rmqueue_bulk() function fills an empty pcplist with pages from the free
> list. It tries to preserve increasing order by pfn to the caller, because it
> leads to better performance with some I/O controllers, as explained in
> e084b2d95e48 ("page-allocator: preserve PFN ordering when __GFP_COLD is set").
>
> To preserve the order, it's sufficient to add pages to the tail of the list
> as they are retrieved. The current code instead adds to the head of the list,
> but then updates the list head pointer to the last added page, in each step.
> This does result in the same order, but is needlessly confusing and potentially
> wasteful, with no apparent benefit. This patch simplifies the code and adjusts
> comment accordingly.
>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2017-10-19 14:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-18 7:59 [PATCH 0/8] Follow-up for speed up page cache truncation v2 Mel Gorman
2017-10-18 7:59 ` [PATCH 1/8] mm, page_alloc: Enable/disable IRQs once when freeing a list of pages Mel Gorman
2017-10-18 9:02 ` Vlastimil Babka
2017-10-18 10:15 ` Mel Gorman
2017-10-18 7:59 ` [PATCH 2/8] mm, truncate: Do not check mapping for every page being truncated Mel Gorman
2017-10-19 8:11 ` Jan Kara
2017-10-18 7:59 ` [PATCH 3/8] mm, truncate: Remove all exceptional entries from pagevec under one lock Mel Gorman
2017-10-18 7:59 ` [PATCH 4/8] mm: Only drain per-cpu pagevecs once per pagevec usage Mel Gorman
2017-10-19 9:12 ` Vlastimil Babka
2017-10-19 9:33 ` Mel Gorman
2017-10-19 13:21 ` Vlastimil Babka
2017-10-18 7:59 ` [PATCH 5/8] mm, pagevec: Remove cold parameter for pagevecs Mel Gorman
2017-10-19 9:24 ` Vlastimil Babka
2017-10-18 7:59 ` [PATCH 6/8] mm: Remove cold parameter for release_pages Mel Gorman
2017-10-19 9:26 ` Vlastimil Babka
2017-10-18 7:59 ` [PATCH 7/8] mm, Remove cold parameter from free_hot_cold_page* Mel Gorman
2017-10-19 13:12 ` Vlastimil Babka
2017-10-19 15:43 ` Mel Gorman
2017-10-18 7:59 ` [PATCH 8/8] mm: Remove __GFP_COLD Mel Gorman
2017-10-19 13:18 ` Vlastimil Babka
2017-10-19 13:42 ` Vlastimil Babka
2017-10-19 14:32 ` Mel Gorman [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-10-12 9:30 [PATCH 0/8] Follow-up for speed up page cache truncation Mel Gorman
2017-10-12 9:31 ` [PATCH 8/8] mm: Remove __GFP_COLD Mel Gorman
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