diff options
| author | Manos Pitsidianakis <el13635@mail.ntua.gr> | 2017-08-25 16:20:27 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-09-06 10:12:02 +0200 |
| commit | d8e7d87ec49c1458f516d50d109b3f201da736a1 (patch) | |
| tree | 79513899899eac436824afc1108b64953acc0cc7 /include | |
| parent | 432d889e55e2614bd0e8bb559af18a61ac217565 (diff) | |
block: add throttle block filter driver
block/throttle.c uses existing I/O throttle infrastructure inside a
block filter driver. I/O operations are intercepted in the filter's
read/write coroutines, and referred to block/throttle-groups.c
The driver can be used with the syntax
-drive driver=throttle,file.filename=foo.qcow2,throttle-group=bar
which registers the throttle filter node with the ThrottleGroup 'bar'. The
given group must be created beforehand with object-add or -object.
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Manos Pitsidianakis <el13635@mail.ntua.gr>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/throttle-groups.h | 5 | ||||
| -rw-r--r-- | include/qemu/throttle-options.h | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/block/throttle-groups.h b/include/block/throttle-groups.h index 82f030523f..e2fd0513c4 100644 --- a/include/block/throttle-groups.h +++ b/include/block/throttle-groups.h @@ -76,5 +76,10 @@ void coroutine_fn throttle_group_co_io_limits_intercept(ThrottleGroupMember *tgm void throttle_group_attach_aio_context(ThrottleGroupMember *tgm, AioContext *new_context); void throttle_group_detach_aio_context(ThrottleGroupMember *tgm); +/* + * throttle_group_exists() must be called under the global + * mutex. + */ +bool throttle_group_exists(const char *name); #endif diff --git a/include/qemu/throttle-options.h b/include/qemu/throttle-options.h index 182b7896e1..3528a8f4a2 100644 --- a/include/qemu/throttle-options.h +++ b/include/qemu/throttle-options.h @@ -29,6 +29,7 @@ #define QEMU_OPT_BPS_WRITE_MAX "bps-write-max" #define QEMU_OPT_BPS_WRITE_MAX_LENGTH "bps-write-max-length" #define QEMU_OPT_IOPS_SIZE "iops-size" +#define QEMU_OPT_THROTTLE_GROUP_NAME "throttle-group" #define THROTTLE_OPT_PREFIX "throttling." #define THROTTLE_OPTS \ |