linux-kernel - Re: [RFC 0/3] reduce latency of direct async compaction

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Message-ID: <20151209054006.GA13682@aaronlu.sh.intel.com>
Date:	Wed, 9 Dec 2015 13:40:06 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>
Subject: Re: [RFC 0/3] reduce latency of direct async compaction

On Wed, Dec 09, 2015 at 09:33:53AM +0900, Joonsoo Kim wrote:
> On Tue, Dec 08, 2015 at 04:52:42PM +0800, Aaron Lu wrote:
> > On Tue, Dec 08, 2015 at 03:51:16PM +0900, Joonsoo Kim wrote:
> > > I add work-around for this problem at isolate_freepages(). Please test
> > > following one.
> > 
> > Still no luck and the error is about the same:
> 
> There is a mistake... Could you insert () for
> cc->free_pfn & ~(pageblock_nr_pages-1) like as following?
> 
> cc->free_pfn == (cc->free_pfn & ~(pageblock_nr_pages-1))

Oh right, of course.

Good news, the result is much better now:
$ cat {0..8}/swap
cmdline: /lkp/aaron/src/bin/usemem 100064603136
100064603136 transferred in 72 seconds, throughput: 1325 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100072049664
100072049664 transferred in 74 seconds, throughput: 1289 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100070246400
100070246400 transferred in 92 seconds, throughput: 1037 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100069545984
100069545984 transferred in 81 seconds, throughput: 1178 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100058895360
100058895360 transferred in 78 seconds, throughput: 1223 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100066074624
100066074624 transferred in 94 seconds, throughput: 1015 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100062855168
100062855168 transferred in 77 seconds, throughput: 1239 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100060990464
100060990464 transferred in 73 seconds, throughput: 1307 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100064996352
100064996352 transferred in 84 seconds, throughput: 1136 MB/s
Max: 1325 MB/s
Min: 1015 MB/s
Avg: 1194 MB/s

The base result for reference:
$ cat {0..8}/swap
cmdline: /lkp/aaron/src/bin/usemem 100000622592
100000622592 transferred in 103 seconds, throughput: 925 MB/s
cmdline: /lkp/aaron/src/bin/usemem 99999559680
99999559680 transferred in 92 seconds, throughput: 1036 MB/s
cmdline: /lkp/aaron/src/bin/usemem 99996171264
99996171264 transferred in 92 seconds, throughput: 1036 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100005663744
100005663744 transferred in 150 seconds, throughput: 635 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100002966528
100002966528 transferred in 87 seconds, throughput: 1096 MB/s
cmdline: /lkp/aaron/src/bin/usemem 99995784192
99995784192 transferred in 131 seconds, throughput: 727 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100003731456
100003731456 transferred in 97 seconds, throughput: 983 MB/s
cmdline: /lkp/aaron/src/bin/usemem 100006440960
100006440960 transferred in 109 seconds, throughput: 874 MB/s
cmdline: /lkp/aaron/src/bin/usemem 99998813184
99998813184 transferred in 122 seconds, throughput: 781 MB/s
Max: 1096 MB/s
Min: 635 MB/s
Avg: 899 MB/s
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