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| author | Peter Lieven <pl@kamp.de> | 2017-03-16 17:02:49 +0100 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2017-03-20 14:57:35 -0500 |
| commit | a3aeb9f09de2d78fa5077b6e8a66d73b7c045a0c (patch) | |
| tree | 8b4cd6434065f0c0378ff2d8f93990021125f86c /Makefile.objs | |
| parent | 34e9c09d03185256d699803d5cb6bfb22872b510 (diff) | |
| download | qemu-a3aeb9f09de2d78fa5077b6e8a66d73b7c045a0c.tar.gz | |
thread-pool: add missing qemu_bh_cancel in completion function
commit 3c80ca15 fixed a deadlock scenarion with nested aio_poll invocations.
However, the rescheduling of the completion BH introcuded unnecessary spinning
in the main-loop. On very fast file backends this can even lead to the
"WARNING: I/O thread spun for 1000 iterations" message popping up.
Callgrind reports about 3-4% less instructions with this patch running
qemu-img bench on a ramdisk based VMDK file.
Fixes: 3c80ca158c96ff902a30883a8933e755988948b1
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit b7a745dc33a18377bb4a8dfe54d1df01ea60bf66)
* drop context dep on b9e413d
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Diffstat (limited to 'Makefile.objs')
0 files changed, 0 insertions, 0 deletions