diff options
| author | Josef Bacik <jbacik@fusionio.com> | 2013-08-30 10:05:22 -0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-01-28 13:20:09 -0800 |
| commit | 4a444b1f06d259ce938a47048840260f71a91c84 (patch) | |
| tree | bc8d5f2d2a3fbbbb3efc50711e3b5cfc14966a7e /block/blk-mq.h | |
| parent | 67de11769bd5ec339a62169f500b04f304826c00 (diff) | |
rwsem: add rwsem_is_contended
Btrfs needs a simple way to know if it needs to let go of it's read lock on a
rwsem. Introduce rwsem_is_contended to check to see if there are any waiters on
this rwsem currently. This is just a hueristic, it is meant to be light and not
100% accurate and called by somebody already holding on to the rwsem in either
read or write. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'block/blk-mq.h')
0 files changed, 0 insertions, 0 deletions