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| author | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-10-08 19:50:24 +0000 |
|---|---|---|
| committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-10-08 19:50:24 +0000 |
| commit | 9e472e101f37233f4e32d181d2fee29014c1cf2f (patch) | |
| tree | 11355529c87a6dce782b8500ce53236b4744600c /qemu-common.h | |
| parent | 235262cf364a839d94e7e9d5b469ac8efb703285 (diff) | |
| download | qemu-9e472e101f37233f4e32d181d2fee29014c1cf2f.tar.gz | |
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
Diffstat (limited to 'qemu-common.h')
| -rw-r--r-- | qemu-common.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/qemu-common.h b/qemu-common.h index 07312235f7..cc95fe62bb 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -139,4 +139,7 @@ struct pcmcia_card_s; void cpu_save(QEMUFile *f, void *opaque); int cpu_load(QEMUFile *f, void *opaque, int version_id); +/* Force QEMU to stop what it's doing and service IO */ +void qemu_service_io(void); + #endif |