diff options
| 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 /compatfd.h | |
| parent | 235262cf364a839d94e7e9d5b469ac8efb703285 (diff) | |
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 'compatfd.h')
| -rw-r--r-- | compatfd.h | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/compatfd.h b/compatfd.h deleted file mode 100644 index 55a111a572..0000000000 --- a/compatfd.h +++ /dev/null @@ -1,28 +0,0 @@ -/* - * signalfd/eventfd compatibility - * - * Copyright IBM, Corp. 2008 - * - * Authors: - * Anthony Liguori <aliguori@us.ibm.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - */ - -#ifndef QEMU_COMPATFD_H -#define QEMU_COMPATFD_H - -#include <signal.h> - -struct qemu_signalfd_siginfo { - uint32_t ssi_signo; - uint8_t pad[124]; -}; - -int qemu_signalfd(const sigset_t *mask); - -int qemu_eventfd(int *fds); - -#endif |