tree 11355529c87a6dce782b8500ce53236b4744600c
parent 235262cf364a839d94e7e9d5b469ac8efb703285
author aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1223495424 +0000
committer aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1223495424 +0000

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