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vmscan: tracing: add trace events for LRU page isolation

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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.

[[email protected]: coding-style fixes]
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: Larry Woodman <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Michael Rubin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2010-08-09 17:19:17 -07:00 • committed by Linus Torvalds
commit a8a94d1515
2 changed files with 62 additions and 0 deletions
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16
mm/vmscan.c
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@ -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;
}