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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2007-03-16 13:38:26 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-16 19:25:05 -0700
commit89a09141df6ac1c3821fbe44ca8384eb37692965 (patch)
treeccb21055fca86ac2657b3262ac37eb3e5c44bea0 /include/linux/backing-dev.h
parentb74a2f0913694556a027795d2954d30523fac4c5 (diff)
downloadop-kernel-dev-89a09141df6ac1c3821fbe44ca8384eb37692965.zip
op-kernel-dev-89a09141df6ac1c3821fbe44ca8384eb37692965.tar.gz
[PATCH] nfs: fix congestion control
The current NFS client congestion logic is severly broken, it marks the backing device congested during each nfs_writepages() call but doesn't mirror this in nfs_writepage() which makes for deadlocks. Also it implements its own waitqueue. Replace this by a more regular congestion implementation that puts a cap on the number of active writeback pages and uses the bdi congestion waitqueue. Also always use an interruptible wait since it makes sense to be able to SIGKILL the process even for mounts without 'intr'. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Christoph Lameter <clameter@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/backing-dev.h')
-rw-r--r--include/linux/backing-dev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 7011d625..f2542c2 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -93,6 +93,7 @@ static inline int bdi_rw_congested(struct backing_dev_info *bdi)
void clear_bdi_congested(struct backing_dev_info *bdi, int rw);
void set_bdi_congested(struct backing_dev_info *bdi, int rw);
long congestion_wait(int rw, long timeout);
+long congestion_wait_interruptible(int rw, long timeout);
void congestion_end(int rw);
#define bdi_cap_writeback_dirty(bdi) \
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