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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>
This commit is contained in:
Mel Gorman 2010-08-09 17:19:17 -07:00 committed by Linus Torvalds
parent 33906bc5c8
commit a8a94d1515
2 changed files with 62 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
include/trace/events/vmscan.h
View File

@ -109,6 +109,52 @@ TRACE_EVENT(mm_vmscan_direct_reclaim_end,
TP_printk("nr_reclaimed=%lu", __entry->nr_reclaimed)
);
TRACE_EVENT(mm_vmscan_lru_isolate,
TP_PROTO(int order,
unsigned long nr_requested,
unsigned long nr_scanned,
unsigned long nr_taken,
unsigned long nr_lumpy_taken,
unsigned long nr_lumpy_dirty,
unsigned long nr_lumpy_failed,
int isolate_mode),
TP_ARGS(order, nr_requested, nr_scanned, nr_taken, nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed, isolate_mode),
TP_STRUCT__entry(
__field(int, order)
__field(unsigned long, nr_requested)
__field(unsigned long, nr_scanned)
__field(unsigned long, nr_taken)
__field(unsigned long, nr_lumpy_taken)
__field(unsigned long, nr_lumpy_dirty)
__field(unsigned long, nr_lumpy_failed)
__field(int, isolate_mode)
),
TP_fast_assign(
__entry->order = order;
__entry->nr_requested = nr_requested;
__entry->nr_scanned = nr_scanned;
__entry->nr_taken = nr_taken;
__entry->nr_lumpy_taken = nr_lumpy_taken;
__entry->nr_lumpy_dirty = nr_lumpy_dirty;
__entry->nr_lumpy_failed = nr_lumpy_failed;
__entry->isolate_mode = isolate_mode;
),
TP_printk("isolate_mode=%d order=%d nr_requested=%lu nr_scanned=%lu nr_taken=%lu contig_taken=%lu contig_dirty=%lu contig_failed=%lu",
__entry->isolate_mode,
__entry->order,
__entry->nr_requested,
__entry->nr_scanned,
__entry->nr_taken,
__entry->nr_lumpy_taken,
__entry->nr_lumpy_dirty,
__entry->nr_lumpy_failed)
);
#endif /* _TRACE_VMSCAN_H */
/* This part must be outside protection */

16
mm/vmscan.c
View File

@ -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;
}