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authorWu Fengguang <fengguang.wu@intel.com>2010-08-11 14:17:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-12 08:43:29 -0700
commit16c4042f08919f447d6b2a55679546c9b97c7264 (patch)
tree0248b64d46237854ebe67efe8c742cb5878d8611 /mm/backing-dev.c
parente50e37201ae2e7d6a52e87815759e6481f0bcfb9 (diff)
downloadlinux-16c4042f08919f447d6b2a55679546c9b97c7264.tar.gz
writeback: avoid unnecessary calculation of bdi dirty thresholds
Split get_dirty_limits() into global_dirty_limits()+bdi_dirty_limit(), so that the latter can be avoided when under global dirty background threshold (which is the normal state for most systems). Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 08d357522e7..eaa4a5bbe06 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -81,7 +81,8 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
nr_more_io++;
spin_unlock(&inode_lock);
- get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);
+ global_dirty_limits(&background_thresh, &dirty_thresh);
+ bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh);
#define K(x) ((x) << (PAGE_SHIFT - 10))
seq_printf(m,