Author: jhibbits
Date: Sun Dec 10 04:43:27 2017
New Revision: 326739
URL: https://svnweb.freebsd.org/changeset/base/326739
Log:
Retrieve the page outside of holding locks
pmap_track_page() only works with physical memory pages, which have a
constant vm_page_t address. Microoptimize pmap_track_page() to perform one
less operation under the lock.
Modified:
head/sys/powerpc/booke/pmap.c
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Sat Dec 9 23:34:00 2017
(r326738)
+++ head/sys/powerpc/booke/pmap.c Sun Dec 10 04:43:27 2017
(r326739)
@@ -4224,10 +4224,10 @@ pmap_track_page(pmap_t pmap, vm_offset_t va)
va = trunc_page(va);
pa = pmap_kextract(va);
+ page = PHYS_TO_VM_PAGE(pa);
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
- page = PHYS_TO_VM_PAGE(pa);
TAILQ_FOREACH(pve, &page->md.pv_list, pv_link) {
if ((pmap == pve->pv_pmap) && (va == pve->pv_va)) {
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