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[Qemu-block] [PATCH 01/12] block: Don't disable I/O throttling on sync r

From: Kevin Wolf
Subject: [Qemu-block] [PATCH 01/12] block: Don't disable I/O throttling on sync requests
Date: Tue, 22 Mar 2016 16:33:01 +0100

We had to disable I/O throttling with synchronous requests because we
didn't use to run timers in nested event loops when the code was
introduced. This isn't true any more, and throttling works just fine
even when using the synchronous API.

The removed code is in fact dead code since commit a8823a3b ('block: Use
blk_co_pwritev() for blk_write()') because I/O throttling can only be
set on the top layer, but BlockBackend always uses the coroutine
interface now instead of using the sync API emulation in block.c.

Signed-off-by: Kevin Wolf <address@hidden>
 block/io.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/block/io.c b/block/io.c
index cce508a..e4438da 100644
--- a/block/io.c
+++ b/block/io.c
@@ -561,17 +561,6 @@ static int bdrv_prwv_co(BlockDriverState *bs, int64_t 
         .flags = flags,
-    /**
-     * In sync call context, when the vcpu is blocked, this throttling timer
-     * will not fire; so the I/O throttling function has to be disabled here
-     * if it has been enabled.
-     */
-    if (bs->io_limits_enabled) {
-        fprintf(stderr, "Disabling I/O throttling on '%s' due "
-                        "to synchronous I/O.\n", bdrv_get_device_name(bs));
-        bdrv_io_limits_disable(bs);
-    }
     if (qemu_in_coroutine()) {
         /* Fast-path if already in coroutine context */

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