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| author | Dan Williams <dan.j.williams@intel.com> | 2016-01-16 00:55:53 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-16 01:56:32 (GMT) |
| commit | 0e749e54244eec87b2a3cd0a4314e60bc6781115 (patch) | |
| tree | 4532abd28b323749964a4e5e0a39c1cd37ed2d8a /fs/block_dev.c | |
| parent | 52db400fcd50216dd8511a0880b936235755836f (diff) | |
| download | linux-0e749e54244eec87b2a3cd0a4314e60bc6781115.tar.xz | |
dax: increase granularity of dax_clear_blocks() operations
dax_clear_blocks is currently performing a cond_resched() after every
PAGE_SIZE memset. We need not check so frequently, for example md-raid
only calls cond_resched() at stripe granularity. Also, in preparation
for introducing a dax_map_atomic() operation that temporarily pins a dax
mapping move the call to cond_resched() to the outer loop.
The worst case latency between calls to cond_resched() after this change
is 500us the average latency is 133us. This is up from a 10us max and
4us average.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jan Kara <jack@suse.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/block_dev.c')
0 files changed, 0 insertions, 0 deletions