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aio / timers: Add prctl(PR_SET_TIMERSLACK, 1, ...) to reduce timer slack

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Where supported, called prctl(PR_SET_TIMERSLACK, 1, ...) to
set one nanosecond timer slack to increase precision of timer
calls.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alex Bligh 2013-08-21 16:02:44 +01:00 • committed by Stefan Hajnoczi
parent 4e0c6529fc
commit cd758dd0ac
2 changed files with 25 additions and 0 deletions
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7
qemu-timer.c
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@ -41,6 +41,10 @@
#include <poll.h>
#endif
#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
#include <sys/prctl.h>
#endif
/***********************************************************/
/* timers */
@ -507,6 +511,9 @@ void init_clocks(void)
vm_clock = qemu_clock_new(QEMU_CLOCK_VIRTUAL);
host_clock = qemu_clock_new(QEMU_CLOCK_HOST);
}
#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
#endif
}
uint64_t timer_expire_time_ns(QEMUTimer *ts)