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Push down the acquisition of the page queues lock into

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vm_pageout_page_stats().  In particular, avoid acquiring the page
queues lock unless iterating over the active queue.
This commit is contained in:
Alan Cox 2010-07-02 20:56:22 +00:00
parent 4b0640310a
commit cdaba1f2be
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=209651
1 changed files with 2 additions and 3 deletions
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5
sys/vm/vm_pageout.c
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@ -1355,7 +1355,6 @@ vm_pageout_page_stats()
static int fullintervalcount = 0;
int page_shortage;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
page_shortage =
(cnt.v_inactive_target + cnt.v_cache_max + cnt.v_free_min) -
(cnt.v_free_count + cnt.v_inactive_count + cnt.v_cache_count);
@ -1363,6 +1362,7 @@ vm_pageout_page_stats()
if (page_shortage <= 0)
return;
vm_page_lock_queues();
pcount = cnt.v_active_count;
fullintervalcount += vm_pageout_stats_interval;
if (fullintervalcount < vm_pageout_full_stats_interval) {
@ -1448,6 +1448,7 @@ vm_pageout_page_stats()
VM_OBJECT_UNLOCK(object);
m = next;
}
vm_page_unlock_queues();
}
/*
@ -1569,9 +1570,7 @@ vm_pageout()
if (error && !vm_pages_needed) {
mtx_unlock(&vm_page_queue_free_mtx);
pass = 0;
vm_page_lock_queues();
vm_pageout_page_stats();
vm_page_unlock_queues();
continue;
}
}