Re: [PATCH 3/3] mm, compaction: disginguish contended status in tracepoint

[Joonsoo Kim]

On Thu, Aug 27, 2015 at 05:24:04PM +0200, Vlastimil Babka wrote:
> Compaction returns prematurely with COMPACT_PARTIAL when contended or has fatal
> signal pending. This is ok for the callers, but might be misleading in the
> traces, as the usual reason to return COMPACT_PARTIAL is that we think the
> allocation should succeed. This patch distinguishes the premature ending
> condition. Further distinguishing the exact reason seems unnecessary for now.

isolate_migratepages() could return ISOLATE_ABORT and skip to call
compact_finished(). trace_mm_compaction_end() will print
COMPACT_PARTIAL in this case and we cannot distinguish premature
ending condition. Is it okay?

Thanks.

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