diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-06-08 18:17:44 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2015-06-12 14:00:00 +0100 |
| commit | 76f4afb40fa076ed23fe0ab42c7a768ddb71123f (patch) | |
| tree | 38d8b57c8c56a457a060866197d03d537653c2a3 /include/block/block_int.h | |
| parent | 1fee955f9cc5903b3c7f79bbd90929aefad583a6 (diff) | |
throttle: Add throttle group support
The throttle group support use a cooperative round robin scheduling
algorithm.
The principles of the algorithm are simple:
- Each BDS of the group is used as a token in a circular way.
- The active BDS computes if a wait must be done and arms the right
timer.
- If a wait must be done the token timer will be armed so the token
will become the next active BDS.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: f0082a86f3ac01c46170f7eafe2101a92e8fde39.1433779731.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/block/block_int.h')
| -rw-r--r-- | include/block/block_int.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h index 8d15c7b680..b174852099 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -379,10 +379,13 @@ struct BlockDriverState { unsigned int serialising_in_flight; /* I/O throttling */ - ThrottleState throttle_state; - ThrottleTimers throttle_timers; CoQueue throttled_reqs[2]; bool io_limits_enabled; + /* The following fields are protected by the ThrottleGroup lock. + * See the ThrottleGroup documentation for details. */ + ThrottleState *throttle_state; + ThrottleTimers throttle_timers; + unsigned pending_reqs[2]; QLIST_ENTRY(BlockDriverState) round_robin; /* I/O stats (display with "info blockstats"). */ |