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[PULL,2/7] aio-posix: avoid unnecessary aio_epoll_enabled() calls

Message ID 1475086537-31704-3-git-send-email-stefanha@redhat.com
State New
Headers show

Commit Message

Stefan Hajnoczi Sept. 28, 2016, 6:15 p.m. UTC 
From: Yaowei Bai <baiyaowei@cmss.chinamobile.com>

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>
---
 aio-posix.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
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Patch

diff --git a/aio-posix.c b/aio-posix.c
index 43162a9..4ef34dd 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);
+            }
         }
     }