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bdrv_change_aio_context: use hash table instead of list of visited nodes

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Minor performance improvement, but given that we have hash tables
available, avoid iterating in the visited nodes list every time just
to check if a node has been already visited.

The data structure is not actually a proper hash map, but an hash set,
as we are just adding nodes and not key,value pairs.

Suggested-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221025084952.2139888-4-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito
2022-10-25 04:49:45 -04:00
committed by Kevin Wolf
parent 7e8c182fb5
commit e08cc001d5
3 changed files with 19 additions and 14 deletions
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2
include/block/block-global-state.h
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@@ -233,7 +233,7 @@ bool bdrv_can_set_aio_context(BlockDriverState *bs, AioContext *ctx,
AioContext *bdrv_child_get_parent_aio_context(BdrvChild *c);
bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx,
GSList **visited, Transaction *tran,
GHashTable *visited, Transaction *tran,
Error **errp);
int bdrv_child_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
BdrvChild *ignore_child, Error **errp);