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authorStefan Hajnoczi <stefanha@redhat.com>2020-02-14 17:17:11 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2020-02-22 08:26:47 +0000
commit4749079ce033a94784cbe20a661abeac598ff057 (patch)
tree048fc56ddd9de5bb9fd76bdc7ecb261492495213 /include/block/aio.h
parent195ed8cb365edeb0d0a70a2ffdeb7a073f9a8117 (diff)
downloadqemu-arm-4749079ce033a94784cbe20a661abeac598ff057.tar.gz
aio-posix: make AioHandler deletion O(1)
It is not necessary to scan all AioHandlers for deletion. Keep a list of deleted handlers instead of scanning the full list of all handlers. The AioHandler->deleted field can be dropped. Let's check if the handler has been inserted into the deleted list instead. Add a new QLIST_IS_INSERTED() API for this check. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Message-id: 20200214171712.541358-5-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/block/aio.h')
-rw-r--r--include/block/aio.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/block/aio.h b/include/block/aio.h
index 1a2ce9ca26..9dd61cee7e 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -42,6 +42,7 @@ void qemu_aio_unref(void *p);
void qemu_aio_ref(void *p);
typedef struct AioHandler AioHandler;
+typedef QLIST_HEAD(, AioHandler) AioHandlerList;
typedef void QEMUBHFunc(void *opaque);
typedef bool AioPollFn(void *opaque);
typedef void IOHandler(void *opaque);
@@ -71,7 +72,10 @@ struct AioContext {
QemuRecMutex lock;
/* The list of registered AIO handlers. Protected by ctx->list_lock. */
- QLIST_HEAD(, AioHandler) aio_handlers;
+ AioHandlerList aio_handlers;
+
+ /* The list of AIO handlers to be deleted. Protected by ctx->list_lock. */
+ AioHandlerList deleted_aio_handlers;
/* Used to avoid unnecessary event_notifier_set calls in aio_notify;
* accessed with atomic primitives. If this field is 0, everything