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authorAndrew Morton <akpm@osdl.org>2006-01-08 04:00:39 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 23:12:40 -0500
commit9d0243bca345d5ce25d3f4b74b7facb3a6df1232 (patch)
treea3a0a763bf83a483282dc1c3caab587941a98fc2 /mm/vmscan.c
parentbec6b0c89b234090681a4516e20ac5debe3e7c59 (diff)
[PATCH] drop-pagecache
Add /proc/sys/vm/drop_caches. When written to, this will cause the kernel to discard as much pagecache and/or reclaimable slab objects as it can. THis operation requires root permissions. It won't drop dirty data, so the user should run `sync' first. Caveats: a) Holds inode_lock for exorbitant amounts of time. b) Needs to be taught about NUMA nodes: propagate these all the way through so the discarding can be controlled on a per-node basis. This is a debugging feature: useful for getting consistent results between filesystem benchmarks. We could possibly put it under a config option, but it's less than 300 bytes. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index be8235fb1939..428c5801d4b4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -180,8 +180,7 @@ EXPORT_SYMBOL(remove_shrinker);
180 * 180 *
181 * Returns the number of slab objects which we shrunk. 181 * Returns the number of slab objects which we shrunk.
182 */ 182 */
183static int shrink_slab(unsigned long scanned, gfp_t gfp_mask, 183int shrink_slab(unsigned long scanned, gfp_t gfp_mask, unsigned long lru_pages)
184 unsigned long lru_pages)
185{ 184{
186 struct shrinker *shrinker; 185 struct shrinker *shrinker;
187 int ret = 0; 186 int ret = 0;