Messages in this thread | | | Date | Tue, 30 Aug 2011 21:09:55 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 2/3] compaction: compact unevictable page |
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On 11/12/2011 11:37 AM, Minchan Kim wrote: > Now compaction doesn't handle mlocked page as it uses __isolate_lru_page > which doesn't consider unevicatable page. It has been used by just lumpy so > it was pointless that it isolates unevictable page. But the situation is > changed. Compaction could handle unevictable page and it can help getting > big contiguos pages in fragment memory by many pinned page with mlock. > > I tested this patch with following scenario. > > 1. A : allocate 80% anon pages in system > 2. B : allocate 20% mlocked page in system > /* Maybe, mlocked pages are located in low pfn address */ > 3. kill A /* high pfn address are free */ > 4. echo 1> /proc/sys/vm/compact_memory > > old: > > compact_blocks_moved 251 > compact_pages_moved 44 > > new: > > compact_blocks_moved 258 > compact_pages_moved 412 > > CC: Mel Gorman<mgorman@suse.de> > CC: Johannes Weiner<jweiner@redhat.com> > CC: Rik van Riel<riel@redhat.com> > Signed-off-by: Minchan Kim<minchan.kim@gmail.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
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