@@ -2817,6 +2817,21 @@ if compile_prog "" "" ; then
ppoll=yes
fi
+# check for prctl(PR_SET_TIMERSLACK , ... ) support
+prctl_pr_set_timerslack=no
+cat > $TMPC << EOF
+#include <sys/prctl.h>
+
+int main(void)
+{
+ prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
+ return 0;
+}
+EOF
+if compile_prog "" "" ; then
+ prctl_pr_set_timerslack=yes
+fi
+
# check for epoll support
epoll=no
cat > $TMPC << EOF
@@ -3811,6 +3826,9 @@ fi
if test "$ppoll" = "yes" ; then
echo "CONFIG_PPOLL=y" >> $config_host_mak
fi
+if test "$prctl_pr_set_timerslack" = "yes" ; then
+ echo "CONFIG_PRCTL_PR_SET_TIMERSLACK=y" >> $config_host_mak
+fi
if test "$epoll" = "yes" ; then
echo "CONFIG_EPOLL=y" >> $config_host_mak
fi
@@ -37,6 +37,10 @@
#include <poll.h>
#endif
+#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
+#include <sys/prctl.h>
+#endif
+
/***********************************************************/
/* timers */
@@ -367,6 +371,9 @@ void init_clocks(void)
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL);
host_clock = qemu_new_clock(QEMU_CLOCK_HOST);
}
+#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
+ prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
+#endif
}
uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts)
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> --- [ Additional patch on the the end of the PATCHv2 series - I'll resend if I have further comments with this reordered so it's next to the ppoll introduction ] configure | 18 ++++++++++++++++++ qemu-timer.c | 7 +++++++ 2 files changed, 25 insertions(+)