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authorAlberto Garcia <berto@igalia.com>2015-06-08 18:17:44 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2015-06-12 14:00:00 +0100
commit76f4afb40fa076ed23fe0ab42c7a768ddb71123f (patch)
tree38d8b57c8c56a457a060866197d03d537653c2a3 /block.c
parent1fee955f9cc5903b3c7f79bbd90929aefad583a6 (diff)
downloadqemu-arm-76f4afb40fa076ed23fe0ab42c7a768ddb71123f.tar.gz
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 'block.c')
-rw-r--r--block.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/block.c b/block.c
index f9c6bb7404..1bc0e7394b 100644
--- a/block.c
+++ b/block.c
@@ -1822,15 +1822,18 @@ static void bdrv_move_feature_fields(BlockDriverState *bs_dest,
bs_dest->enable_write_cache = bs_src->enable_write_cache;
/* i/o throttled req */
- memcpy(&bs_dest->throttle_state,
- &bs_src->throttle_state,
- sizeof(ThrottleState));
+ bs_dest->throttle_state = bs_src->throttle_state,
+ bs_dest->io_limits_enabled = bs_src->io_limits_enabled;
+ bs_dest->pending_reqs[0] = bs_src->pending_reqs[0];
+ bs_dest->pending_reqs[1] = bs_src->pending_reqs[1];
+ bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0];
+ bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1];
+ memcpy(&bs_dest->round_robin,
+ &bs_src->round_robin,
+ sizeof(bs_dest->round_robin));
memcpy(&bs_dest->throttle_timers,
&bs_src->throttle_timers,
sizeof(ThrottleTimers));
- bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0];
- bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1];
- bs_dest->io_limits_enabled = bs_src->io_limits_enabled;
/* r/w error */
bs_dest->on_read_error = bs_src->on_read_error;