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| author | Mel Gorman <mgorman@suse.de> | 2012-07-31 16:44:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 18:42:46 -0700 |
| commit | 5515061d22f0f9976ae7815864bfd22042d36848 (patch) | |
| tree | 13b53a29166f19eb864e96b3b58539a207e5fa2f /mm/page_alloc.c | |
| parent | 7f338fe4540b1d0600b02314c7d885fd358e9eca (diff) | |
| download | linux-3.10-5515061d22f0f9976ae7815864bfd22042d36848.tar.gz linux-3.10-5515061d22f0f9976ae7815864bfd22042d36848.tar.bz2 linux-3.10-5515061d22f0f9976ae7815864bfd22042d36848.zip | |
mm: throttle direct reclaimers if PF_MEMALLOC reserves are low and swap is backed by network storage
If swap is backed by network storage such as NBD, there is a risk that a
large number of reclaimers can hang the system by consuming all
PF_MEMALLOC reserves. To avoid these hangs, the administrator must tune
min_free_kbytes in advance which is a bit fragile.
This patch throttles direct reclaimers if half the PF_MEMALLOC reserves
are in use. If the system is routinely getting throttled the system
administrator can increase min_free_kbytes so degradation is smoother but
the system will keep running.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: David Miller <davem@davemloft.net>
Cc: Neil Brown <neilb@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Eric B Munson <emunson@mgebm.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index ef2d1e72fc0..48aee0f5902 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4389,6 +4389,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat, pgdat_resize_init(pgdat); pgdat->nr_zones = 0; init_waitqueue_head(&pgdat->kswapd_wait); + init_waitqueue_head(&pgdat->pfmemalloc_wait); pgdat->kswapd_max_order = 0; pgdat_page_cgroup_init(pgdat); |