qemu/qemu-tool.c
aliguori 9e472e101f 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
2008-10-08 19:50:24 +00:00

88 lines
1.4 KiB
C

/*
* Compatibility for qemu-img/qemu-nbd
*
* 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.
*
*/
#include "qemu-common.h"
#include "console.h"
#include "sysemu.h"
#include "qemu-timer.h"
#include <sys/time.h>
QEMUClock *rt_clock;
struct QEMUBH
{
QEMUBHFunc *cb;
void *opaque;
};
void qemu_service_io(void)
{
}
void term_printf(const char *fmt, ...)
{
}
void term_print_filename(const char *filename)
{
}
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
{
QEMUBH *bh;
bh = qemu_malloc(sizeof(*bh));
if (bh) {
bh->cb = cb;
bh->opaque = opaque;
}
return bh;
}
int qemu_bh_poll(void)
{
return 0;
}
void qemu_bh_schedule(QEMUBH *bh)
{
bh->cb(bh->opaque);
}
void qemu_bh_cancel(QEMUBH *bh)
{
}
void qemu_bh_delete(QEMUBH *bh)
{
qemu_free(bh);
}
int qemu_set_fd_handler2(int fd,
IOCanRWHandler *fd_read_poll,
IOHandler *fd_read,
IOHandler *fd_write,
void *opaque)
{
return 0;
}
int64_t qemu_get_clock(QEMUClock *clock)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000)) / 1000000;
}