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authorRik van Riel <riel@redhat.com>2012-05-29 15:06:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:19 -0700
commite709ffd6169ccd259eb5874e853303e91e94e829 (patch)
tree796b56c2507b8581492da73e354d651c9dd7076b /mm/vmscan.c
parentedad9d2c337d43278a9d5aeb0ed531c2e838f8a6 (diff)
downloadlinux-e709ffd6169ccd259eb5874e853303e91e94e829.tar.bz2
mm: remove swap token code
The swap token code no longer fits in with the current VM model. It does not play well with cgroups or the better NUMA placement code in development, since we have only one swap token globally. It also has the potential to mess with scalability of the system, by increasing the number of non-reclaimable pages on the active and inactive anon LRU lists. Last but not least, the swap token code has been broken for a year without complaints, as reported by Konstantin Khlebnikov. This suggests we no longer have much use for it. The days of sub-1G memory systems with heavy use of swap are over. If we ever need thrashing reducing code in the future, we will have to implement something that does scale. Signed-off-by: Rik van Riel <riel@redhat.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Hugh Dickins <hughd@google.com> Acked-by: Bob Picco <bpicco@meloft.net> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 33dc256033b5..ca46080bb074 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2352,8 +2352,6 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
sc->nr_scanned = 0;
- if (!priority)
- disable_swap_token(sc->target_mem_cgroup);
aborted_reclaim = shrink_zones(priority, zonelist, sc);
/*
@@ -2704,10 +2702,6 @@ loop_again:
unsigned long lru_pages = 0;
int has_under_min_watermark_zone = 0;
- /* The swap token gets in the way of swapout... */
- if (!priority)
- disable_swap_token(NULL);
-
all_zones_ok = 1;
balanced = 0;