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 | |
| parent | 1fee955f9cc5903b3c7f79bbd90929aefad583a6 (diff) | |
| download | qemu-76f4afb40fa076ed23fe0ab42c7a768ddb71123f.zip qemu-76f4afb40fa076ed23fe0ab42c7a768ddb71123f.tar.gz qemu-76f4afb40fa076ed23fe0ab42c7a768ddb71123f.tar.bz2 | |
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')
| -rw-r--r-- | include/block/block.h | 3 | ||||
| -rw-r--r-- | include/block/block_int.h | 7 | ||||
| -rw-r--r-- | include/block/throttle-groups.h | 4 |
3 files changed, 11 insertions, 3 deletions
diff --git a/include/block/block.h b/include/block/block.h index f7680b6..f6fb8c4 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -173,8 +173,9 @@ void bdrv_stats_print(Monitor *mon, const QObject *data); void bdrv_info_stats(Monitor *mon, QObject **ret_data); /* disk I/O throttling */ -void bdrv_io_limits_enable(BlockDriverState *bs); +void bdrv_io_limits_enable(BlockDriverState *bs, const char *group); void bdrv_io_limits_disable(BlockDriverState *bs); +void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group); void bdrv_init(void); void bdrv_init_with_whitelist(void); diff --git a/include/block/block_int.h b/include/block/block_int.h index 8d15c7b..b174852 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"). */ diff --git a/include/block/throttle-groups.h b/include/block/throttle-groups.h index b966ec7..322139a 100644 --- a/include/block/throttle-groups.h +++ b/include/block/throttle-groups.h @@ -36,4 +36,8 @@ void throttle_group_get_config(BlockDriverState *bs, ThrottleConfig *cfg); void throttle_group_register_bs(BlockDriverState *bs, const char *groupname); void throttle_group_unregister_bs(BlockDriverState *bs); +void coroutine_fn throttle_group_co_io_limits_intercept(BlockDriverState *bs, + unsigned int bytes, + bool is_write); + #endif |