aboutsummaryrefslogtreecommitdiff
path: root/aio-posix.c
diff options
context:
space:
mode:
authorYaowei Bai <baiyaowei@cmss.chinamobile.com>2016-09-14 07:03:39 -0400
committerStefan Hajnoczi <stefanha@redhat.com>2016-09-28 11:21:46 +0100
commit6b9424689a32bb76942ec39f6d5c60b72eb002e0 (patch)
treed3b4a020db45b5b41f3c00018736bcdf400c5fd3 /aio-posix.c
parente7e4f9f950253ce5fb03f569868a21d6d7e3f8a2 (diff)
downloadqemu-arm-6b9424689a32bb76942ec39f6d5c60b72eb002e0.tar.gz
aio-posix: avoid unnecessary aio_epoll_enabled() calls
As epoll whether enabled or not is a global setting, we can just check it only once rather than checking it with every node iteration. Through this we can avoid a lot of checks when epoll is not enabled. Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Reviewed-by: Xiubo Li <lixiubo@cmss.chinamobile.com> Message-id: 1473851019-7005-3-git-send-email-baiyaowei@cmss.chinamobile.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'aio-posix.c')
-rw-r--r--aio-posix.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/aio-posix.c b/aio-posix.c
index 43162a9f29..4ef34dd175 100644
--- a/aio-posix.c
+++ b/aio-posix.c
@@ -431,11 +431,13 @@ bool aio_poll(AioContext *ctx, bool blocking)
assert(npfd == 0);
/* fill pollfds */
- QLIST_FOREACH(node, &ctx->aio_handlers, node) {
- if (!node->deleted && node->pfd.events
- && !aio_epoll_enabled(ctx)
- && aio_node_check(ctx, node->is_external)) {
- add_pollfd(node);
+
+ if (!aio_epoll_enabled(ctx)) {
+ QLIST_FOREACH(node, &ctx->aio_handlers, node) {
+ if (!node->deleted && node->pfd.events
+ && aio_node_check(ctx, node->is_external)) {
+ add_pollfd(node);
+ }
}
}