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Introduce a Boolean variable wakeup_needed to avoid repeated, unnecessary

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calls to wakeup() by vm_page_zero_idle_wakeup().
This commit is contained in:
Alan Cox 2004-10-31 19:32:57 +00:00
parent 411f23b06e
commit f790de29b9
1 changed files with 9 additions and 2 deletions
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11
sys/vm/vm_zeroidle.c
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@ -76,6 +76,7 @@ TUNABLE_INT("vm.idlezero_maxrun", &idlezero_maxrun);
#define ZIDLE_LO(v) ((v) * 2 / 3)
#define ZIDLE_HI(v) ((v) * 4 / 5)
static boolean_t wakeup_needed = FALSE;
static int zero_state;
static int
@ -130,8 +131,11 @@ void
vm_page_zero_idle_wakeup(void)
{
if (idlezero_enable && vm_page_zero_check())
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if (wakeup_needed && vm_page_zero_check()) {
wakeup_needed = FALSE;
wakeup(&zero_state);
}
}
static void
@ -163,7 +167,10 @@ vm_pagezero(void __unused *arg)
}
#endif
} else {
tsleep(&zero_state, pri, "pgzero", hz * 300);
vm_page_lock_queues();
wakeup_needed = TRUE;
msleep(&zero_state, &vm_page_queue_mtx, PDROP | pri,
"pgzero", hz * 300);
pages = 0;
}
}