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[1/7] block: Don't disable I/O throttling on sync requests

Message ID 1458837566-108527-2-git-send-email-pbonzini@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Paolo Bonzini March 24, 2016, 4:39 p.m. UTC 
From: Kevin Wolf <kwolf@redhat.com>

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 <kwolf@redhat.com>
Message-Id: <1458660792-3035-2-git-send-email-kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block/io.c | 11 -----------
 1 file changed, 11 deletions(-)
diff mbox

Patch

diff --git a/block/io.c b/block/io.c
index 41d954ca..cbba269 100644
--- a/block/io.c
+++ b/block/io.c
@@ -561,17 +561,6 @@  static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset,
         .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 */
         bdrv_rw_co_entry(&rwco);