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Fix msleep() usage in Xen balloon driver to not wake up on every HZ tick.

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This commit is contained in:
Alexander Motin 2011-05-13 03:40:16 +00:00
parent 8fedd5eb65
commit c4f9a10590
1 changed files with 7 additions and 11 deletions
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18
sys/dev/xen/balloon/balloon.c
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@ -147,12 +147,6 @@ balloon_retrieve(void)
return page;
}
static void
balloon_alarm(void *unused)
{
wakeup(balloon_process);
}
static unsigned long
current_target(void)
{
@ -378,6 +372,8 @@ balloon_process(void *unused)
mtx_lock(&balloon_mutex);
for (;;) {
int sleep_time;
do {
credit = current_target() - bs.current_pages;
if (credit > 0)
@ -389,9 +385,12 @@ balloon_process(void *unused)
/* Schedule more work if there is some still to be done. */
if (current_target() != bs.current_pages)
timeout(balloon_alarm, NULL, ticks + hz);
sleep_time = hz;
else
sleep_time = 0;
msleep(balloon_process, &balloon_mutex, 0, "balloon", -1);
msleep(balloon_process, &balloon_mutex, 0, "balloon",
sleep_time);
}
mtx_unlock(&balloon_mutex);
}
@ -474,9 +473,6 @@ balloon_init(void *arg)
bs.hard_limit = ~0UL;
kproc_create(balloon_process, NULL, NULL, 0, 0, "balloon");
// init_timer(&balloon_timer);
// balloon_timer.data = 0;
// balloon_timer.function = balloon_alarm;
#ifndef XENHVM
/* Initialise the balloon with excess memory space. */