Re: [patch 1/2 v2]compaction: abort compaction loop if lock is contended or run too long

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On Tue, Sep 11, 2012 at 10:45:55AM +0900, Minchan Kim wrote:
> On Mon, Sep 10, 2012 at 09:18:30AM +0800, Shaohua Li wrote:
> > isolate_migratepages_range() might isolate none pages, for example, when
> > zone->lru_lock is contended and compaction is async. In this case, we should
> > abort compaction, otherwise, compact_zone will run a useless loop and make
> > zone->lru_lock is even contended.
> > 
> 
> As I read old thread, you have the scenario and number.
> Please include them in this description.

that is just to show how the contention is, not performance data. I thought
explaining the contention is enough. How did you think?

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