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| author | Mel Gorman <mel@csn.ul.ie> | 2010-08-09 17:19:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-09 20:44:59 -0700 |
| commit | a8a94d151521b248727c1f88756174e15260815a (patch) | |
| tree | 81ea18e9c52f6260f9b52b16e592cc89bfd9d260 /mm/vmscan.c | |
| parent | 33906bc5c87b50028364405ec425de9638afc719 (diff) | |
| download | lwn-a8a94d151521b248727c1f88756174e15260815a.tar.gz lwn-a8a94d151521b248727c1f88756174e15260815a.zip | |
vmscan: tracing: add trace events for LRU page isolation
Add an event for when pages are isolated en-masse from the LRU lists.
This event augments the information available on LRU traffic and can be
used to evaluate lumpy reclaim.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index c99bc418c4cf..3d006d91a526 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -919,6 +919,9 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, unsigned long *scanned, int order, int mode, int file) { unsigned long nr_taken = 0; + unsigned long nr_lumpy_taken = 0; + unsigned long nr_lumpy_dirty = 0; + unsigned long nr_lumpy_failed = 0; unsigned long scan; for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) { @@ -996,12 +999,25 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, list_move(&cursor_page->lru, dst); mem_cgroup_del_lru(cursor_page); nr_taken++; + nr_lumpy_taken++; + if (PageDirty(cursor_page)) + nr_lumpy_dirty++; scan++; + } else { + if (mode == ISOLATE_BOTH && + page_count(cursor_page)) + nr_lumpy_failed++; } } } *scanned = scan; + + trace_mm_vmscan_lru_isolate(order, + nr_to_scan, scan, + nr_taken, + nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed, + mode); return nr_taken; } |