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From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Sun, 10 Dec 2017 04:43:27 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r326739 - head/sys/powerpc/booke
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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)) {