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| author | Joe Thornber <ejt@redhat.com> | 2015-06-26 14:25:12 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-08-12 17:32:19 +0200 |
| commit | 4051aab762f161826f15ea63c8baaf33cb5e6fe3 (patch) | |
| tree | c4435cbfd451b46cb7cac41a5be8e763192d7c3b /drivers/md/multipath.h | |
| parent | dm cache policy smq: move 'dm-cache-default' module alias to SMQ (diff) | |
| download | linux-4051aab762f161826f15ea63c8baaf33cb5e6fe3.tar.xz linux-4051aab762f161826f15ea63c8baaf33cb5e6fe3.zip | |
dm cache policy smq: change the mutex to a spinlock
We no longer sleep in any of the smq functions, so this can become a
spinlock. Switching from mutex to spinlock improves performance when
the fast cache device is a very low latency device (e.g. NVMe SSD).
The switch to spinlock also allows for removal of the extra tick_lock;
which is no longer needed since the main lock being a spinlock now
fulfills the locking requirements needed by interrupt context.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/multipath.h')
0 files changed, 0 insertions, 0 deletions