diff options
author | dillon <dillon@FreeBSD.org> | 2001-07-05 01:32:42 +0000 |
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committer | dillon <dillon@FreeBSD.org> | 2001-07-05 01:32:42 +0000 |
commit | 1cf218e40f33f1f84ab5aea35ab812cfa1b46302 (patch) | |
tree | 4f13877024500ba8eed1f8aa537da3e416268450 /sys/amd64 | |
parent | 93369f554a43c46419d56436721efe61e4b858c7 (diff) | |
download | FreeBSD-src-1cf218e40f33f1f84ab5aea35ab812cfa1b46302.zip FreeBSD-src-1cf218e40f33f1f84ab5aea35ab812cfa1b46302.tar.gz |
Move vm_page_zero_idle() from machine-dependant sections to a
machine-independant source file, vm/vm_zeroidle.c. It was exactly the
same for all platforms and updating them all was getting annoying.
Diffstat (limited to 'sys/amd64')
-rw-r--r-- | sys/amd64/amd64/vm_machdep.c | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c index 51072e7..e5e5ea6 100644 --- a/sys/amd64/amd64/vm_machdep.c +++ b/sys/amd64/amd64/vm_machdep.c @@ -550,67 +550,6 @@ grow_stack(p, sp) return (1); } -SYSCTL_DECL(_vm_stats_misc); - -static int cnt_prezero; - -SYSCTL_INT(_vm_stats_misc, OID_AUTO, - cnt_prezero, CTLFLAG_RD, &cnt_prezero, 0, ""); - -/* - * Implement the pre-zeroed page mechanism. - * This routine is called from the idle loop. - */ - -#define ZIDLE_LO(v) ((v) * 2 / 3) -#define ZIDLE_HI(v) ((v) * 4 / 5) - -int -vm_page_zero_idle() -{ - static int free_rover; - static int zero_state; - vm_page_t m; - - /* - * Attempt to maintain approximately 1/2 of our free pages in a - * PG_ZERO'd state. Add some hysteresis to (attempt to) avoid - * generally zeroing a page when the system is near steady-state. - * Otherwise we might get 'flutter' during disk I/O / IPC or - * fast sleeps. We also do not want to be continuously zeroing - * pages because doing so may flush our L1 and L2 caches too much. - */ - - if (zero_state && vm_page_zero_count >= ZIDLE_LO(cnt.v_free_count)) - return(0); - if (vm_page_zero_count >= ZIDLE_HI(cnt.v_free_count)) - return(0); - - if (mtx_trylock(&Giant)) { - zero_state = 0; - m = vm_pageq_find(PQ_FREE, free_rover, FALSE); - if (m != NULL && (m->flags & PG_ZERO) == 0) { - vm_page_queues[m->queue].lcnt--; - TAILQ_REMOVE(&vm_page_queues[m->queue].pl, m, pageq); - m->queue = PQ_NONE; - pmap_zero_page(VM_PAGE_TO_PHYS(m)); - vm_page_flag_set(m, PG_ZERO); - m->queue = PQ_FREE + m->pc; - vm_page_queues[m->queue].lcnt++; - TAILQ_INSERT_TAIL(&vm_page_queues[m->queue].pl, m, - pageq); - ++vm_page_zero_count; - ++cnt_prezero; - if (vm_page_zero_count >= ZIDLE_HI(cnt.v_free_count)) - zero_state = 1; - } - free_rover = (free_rover + PQ_PRIME2) & PQ_L2_MASK; - mtx_unlock(&Giant); - return (1); - } - return(0); -} - /* * Software interrupt handler for queued VM system processing. */ |