aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/sysctl.h
diff options
context:
space:
mode:
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 /include/linux/sysctl.h
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 'include/linux/sysctl.h')
-rw-r--r--include/linux/sysctl.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index a9b80fc7f0f3..4cd267fe87ec 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -180,6 +180,7 @@ enum
180 VM_VFS_CACHE_PRESSURE=26, /* dcache/icache reclaim pressure */ 180 VM_VFS_CACHE_PRESSURE=26, /* dcache/icache reclaim pressure */
181 VM_LEGACY_VA_LAYOUT=27, /* legacy/compatibility virtual address space layout */ 181 VM_LEGACY_VA_LAYOUT=27, /* legacy/compatibility virtual address space layout */
182 VM_SWAP_TOKEN_TIMEOUT=28, /* default time for token time out */ 182 VM_SWAP_TOKEN_TIMEOUT=28, /* default time for token time out */
183 VM_DROP_PAGECACHE=29, /* int: nuke lots of pagecache */
183}; 184};
184 185
185 186