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| author | Slava Pestov <sp@daterainc.com> | 2014-05-01 13:48:57 -0700 |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2014-08-04 15:23:03 -0700 |
| commit | 9e5c353510b26500bd6b8309823ac9ef2837b761 (patch) | |
| tree | ff1ff3500ed20d3b9ac2dc3338e1d6ad87e9e0ea /drivers/md/bcache/super.c | |
| parent | c5aa4a3157b55bdca18dd2a9d9f43314470b6d32 (diff) | |
| download | linux-9e5c353510b26500bd6b8309823ac9ef2837b761.tar.gz linux-9e5c353510b26500bd6b8309823ac9ef2837b761.tar.bz2 linux-9e5c353510b26500bd6b8309823ac9ef2837b761.zip | |
bcache: fix uninterruptible sleep in writeback thread
There were two issues here:
- writeback thread did not start until the device first became dirty
- writeback thread used uninterruptible sleep once running
Without this patch I see kernel warnings printed and a load average of
1.52 after booting my test VM. With this patch the warnings are gone and
the load average is near 0.00 as expected.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers/md/bcache/super.c')
| -rw-r--r-- | drivers/md/bcache/super.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 3b043a04d9bd..00cc42550f34 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1042,6 +1042,9 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) */ atomic_set(&dc->count, 1); + if (bch_cached_dev_writeback_start(dc)) + return -ENOMEM; + if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { bch_sectors_dirty_init(dc); atomic_set(&dc->has_dirty, 1); |