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| author | alc <alc@FreeBSD.org> | 2014-02-09 01:59:52 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2014-02-09 01:59:52 +0000 |
| commit | 43e9da37b5b1255112f13dc5bdccacc53aaa04b5 (patch) | |
| tree | 46d3a03eec54f381cf2193378ccdd26e14def626 /sys/vm | |
| parent | 0a15dbb231ef45e0d61995ff08d080a85ea69172 (diff) | |
| download | FreeBSD-src-43e9da37b5b1255112f13dc5bdccacc53aaa04b5.zip FreeBSD-src-43e9da37b5b1255112f13dc5bdccacc53aaa04b5.tar.gz | |
Don't call vm_fault_prefault() on zero-fill faults. It's a waste of time.
Successful prefaults after a zero-fill fault are extremely rare.
Diffstat (limited to 'sys/vm')
| -rw-r--r-- | sys/vm/vm_fault.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index f8e3c3f..4a6495f 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -652,6 +652,8 @@ vnode_locked: } PCPU_INC(cnt.v_zfod); fs.m->valid = VM_PAGE_BITS_ALL; + /* Don't try to prefault neighboring pages. */ + faultcount = 1; break; /* break to PAGE HAS BEEN FOUND */ } else { KASSERT(fs.object != next_object, @@ -897,7 +899,8 @@ vnode_locked: * won't find it (yet). */ pmap_enter(fs.map->pmap, vaddr, fault_type, fs.m, prot, wired); - if ((fault_flags & VM_FAULT_CHANGE_WIRING) == 0 && wired == 0) + if (faultcount != 1 && (fault_flags & VM_FAULT_CHANGE_WIRING) == 0 && + wired == 0) vm_fault_prefault(&fs, vaddr, faultcount, reqpage); VM_OBJECT_WLOCK(fs.object); vm_page_lock(fs.m); |
