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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-10-08 19:50:24 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-10-08 19:50:24 +0000
commit9e472e101f37233f4e32d181d2fee29014c1cf2f (patch)
tree11355529c87a6dce782b8500ce53236b4744600c /compatfd.h
parent235262cf364a839d94e7e9d5b469ac8efb703285 (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.h28
1 files changed, 0 insertions, 28 deletions
diff --git a/compatfd.h b/compatfd.h
deleted file mode 100644
index 55a111a57..000000000
--- 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