17 Jul, 2007
1 commit
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invalidate_mapping_pages() can sometimes take a long time (millions of pages
to free). Long enough for the softlockup detector to trigger.We used to have a cond_resched() in there but I took it out because the
drop_caches code calls invalidate_mapping_pages() under inode_lock.The patch adds a nasty flag and puts the cond_resched() back.
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
12 Feb, 2007
1 commit
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Convert all calls to invalidate_inode_pages() into open-coded calls to
invalidate_mapping_pages().Leave the invalidate_inode_pages() wrapper in place for now, marked as
deprecated.Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Jan, 2006
1 commit
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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