• Vlastimil Babka's avatar
    mm, compaction: distinguish contended status in tracepoints · 2d1e1041
    Vlastimil Babka authored
    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.  After this patch we distinguish the
    premature ending condition in the mm_compaction_finished and
    mm_compaction_end tracepoints.
    The contended status covers the following reasons:
    - lock contention or need_resched() detected in async compaction
    - fatal signal pending
    - too many pages isolated in the zone (only for async compaction)
    Further distinguishing the exact reason seems unnecessary for now.
    Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
compaction.h 7.98 KB