Re: [PATCH 4/4] mm: compaction: Abort compaction if too many pagesare isolated and caller is asynchronous V2

[Michal Hocko]

On Tue 07-06-11 17:27:11, Mel Gorman wrote:
> Changelog since V1
>   o Return COMPACT_PARTIAL when aborting due to too many isolated
>     pages. As pointed out by Minchan, this is better for consistency
> 
> Asynchronous compaction is used when promoting to huge pages. This is
> all very nice but if there are a number of processes in compacting
> memory, a large number of pages can be isolated. An "asynchronous"
> process can stall for long periods of time as a result with a user
> reporting that firefox can stall for 10s of seconds. This patch aborts
> asynchronous compaction if too many pages are isolated as it's better to
> fail a hugepage promotion than stall a process.
> 
> [minchan.kim@xxxxxxxxx: Return COMPACT_PARTIAL for abort]
> Reported-and-tested-by: Ury Stankevich <urykhy@xxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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