Patchwork [1/2] block: add the support to drain throttled requests

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Submitter Zhiyong Wu
Date March 27, 2012, 5:55 a.m.
Message ID <1332827758-32316-1-git-send-email-zwu.kernel@gmail.com>
Download mbox | patch
Permalink /patch/148861/
State New
Headers show

Comments

Zhiyong Wu - March 27, 2012, 5:55 a.m.
From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
---
 block.c |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

Patch

diff --git a/block.c b/block.c
index b88ee90..1fbf4dd 100644
--- a/block.c
+++ b/block.c
@@ -862,8 +862,22 @@  void bdrv_close_all(void)
 void bdrv_drain_all(void)
 {
     BlockDriverState *bs;
+    bool busy;
 
-    qemu_aio_flush();
+    do {
+        busy = false;
+        qemu_aio_flush();
+
+        /* FIXME: We do not have timer support here, so this is effectively
+         * a busy wait.
+         */
+        QTAILQ_FOREACH(bs, &bdrv_states, list) {
+            if (!qemu_co_queue_empty(&bs->throttled_reqs)) {
+                qemu_co_queue_restart_all(&bs->throttled_reqs);
+                busy = true;
+            }
+        }
+    } while (busy);
 
     /* If requests are still pending there is a bug somewhere */
     QTAILQ_FOREACH(bs, &bdrv_states, list) {