From 9d0243bca345d5ce25d3f4b74b7facb3a6df1232 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Sun, 8 Jan 2006 01:00:39 -0800 Subject: [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 Signed-off-by: Linus Torvalds --- mm/truncate.c | 1 - mm/vmscan.c | 3 +-- 2 files changed, 1 insertion(+), 3 deletions(-) (limited to 'mm') diff --git a/mm/truncate.c b/mm/truncate.c index 7dee327459017f..b1a463d0fe713d 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -249,7 +249,6 @@ unlock: break; } pagevec_release(&pvec); - cond_resched(); } return ret; } diff --git a/mm/vmscan.c b/mm/vmscan.c index be8235fb193945..428c5801d4b45c 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -180,8 +180,7 @@ EXPORT_SYMBOL(remove_shrinker); * * Returns the number of slab objects which we shrunk. */ -static int shrink_slab(unsigned long scanned, gfp_t gfp_mask, - unsigned long lru_pages) +int shrink_slab(unsigned long scanned, gfp_t gfp_mask, unsigned long lru_pages) { struct shrinker *shrinker; int ret = 0; -- cgit 1.2.3-korg