| commit | 9e472e101f37233f4e32d181d2fee29014c1cf2f | |
| author | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | |
| Wed, 8 Oct 2008 19:50:24 +0000 (8 19:50 +0000) | ||
| committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | |
| Wed, 8 Oct 2008 19:50:24 +0000 (8 19:50 +0000) | ||
| tree | 11355529c87a6dce782b8500ce53236b4744600c | treesnapshot (tar.gz zip) |
| parent | 235262cf364a839d94e7e9d5b469ac8efb703285 | commitdiff |
Fix IO performance regression in sparc
Replace signalfd with signal handler/pipe. There is no way to interrupt
the CPU execution loop when a file descriptor becomes readable. This
results in a large performance regression in sparc emulation during
bootup.
This patch switches us to signal handler/pipe which was originally
suggested by Ian Jackson. The signal handler lets us interrupt the
CPU emulation loop while the write to a pipe lets us avoid the
select/signal race condition.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5451 c046a42c-6fe2-441c-8c8c-71466251a162
Replace signalfd with signal handler/pipe. There is no way to interrupt
the CPU execution loop when a file descriptor becomes readable. This
results in a large performance regression in sparc emulation during
bootup.
This patch switches us to signal handler/pipe which was originally
suggested by Ian Jackson. The signal handler lets us interrupt the
CPU emulation loop while the write to a pipe lets us avoid the
select/signal race condition.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5451 c046a42c-6fe2-441c-8c8c-71466251a162