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SubjectRe: excessive CPU utilization by isolate_freepages?
On Thu, 28 Jun 2012, Minchan Kim wrote:

> >>> > > https://lkml.org/lkml/2012/6/21/30
> >> >
> > Not sure if Jim is using memcg; if not, then this won't be helpful.
> >
>
>
> It doesn't related to memcg.
> if compaction_alloc can't find suitable migration target, it returns NULL.
> Then, migrate_pages should be exit.
>

If isolate_freepages() is going to fail, then this zone should have been
skipped when checking for compaction_suitable(). In Jim's perf output,
compaction_suitable() returns COMPACT_CONTINUE for a transparent hugepage.
Why is zone_watermark_ok(zone, 0 low_wmark + 1024, 0, 0) succeeding if
isolate_freepages() is going to fail?


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