diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-01-08 04:00:39 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 23:12:40 -0500 |
| commit | 9d0243bca345d5ce25d3f4b74b7facb3a6df1232 (patch) | |
| tree | a3a0a763bf83a483282dc1c3caab587941a98fc2 /mm/page_alloc.c | |
| parent | bec6b0c89b234090681a4516e20ac5debe3e7c59 (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/page_alloc.c')
0 files changed, 0 insertions, 0 deletions