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| author | Mel Gorman <mel@csn.ul.ie> | 2008-07-03 05:27:51 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-03 09:22:59 -0700 |
| commit | 494de90098784b8e2797598cefdd34188884ec2e (patch) | |
| tree | cef8c0655f85ed64bb7426df3eeb794c2cf27580 | |
| parent | c461a973118346d5c103aaaddd62e53939fd7c67 (diff) | |
| download | op-kernel-dev-494de90098784b8e2797598cefdd34188884ec2e.zip op-kernel-dev-494de90098784b8e2797598cefdd34188884ec2e.tar.gz | |
Do not overwrite nr_zones on !NUMA when initialising zlcache_ptr
The non-NUMA case of build_zonelist_cache() would initialize the
zlcache_ptr for both node_zonelists[] to NULL.
Which is problematic, since non-NUMA only has a single node_zonelists[]
entry, and trying to zero the non-existent second one just overwrote the
nr_zones field instead.
As kswapd uses this value to determine what reclaim work is necessary,
the result is that kswapd never reclaims. This causes processes to
stall frequently in low-memory situations as they always direct reclaim.
This patch initialises zlcache_ptr correctly.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Tested-by: Dan Williams <dan.j.williams@intel.com>
[ Simplified patch a bit ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_alloc.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2f55295..f32fae3 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2328,7 +2328,6 @@ static void build_zonelists(pg_data_t *pgdat) static void build_zonelist_cache(pg_data_t *pgdat) { pgdat->node_zonelists[0].zlcache_ptr = NULL; - pgdat->node_zonelists[1].zlcache_ptr = NULL; } #endif /* CONFIG_NUMA */ |
