Alan Cox wrote:
Author: alc
Date: Sun Oct 4 18:53:10 2009
New Revision: 197750
URL: http://svn.freebsd.org/changeset/base/197750
Log:
Align and pad the page queue and free page queue locks so that the linker
can't possibly place them together within the same cache line.
MFC after: 3 weeks
Modified:
head/sys/vm/vm_page.c
head/sys/vm/vm_page.h
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Sun Oct 4 17:22:51 2009 (r197749)
+++ head/sys/vm/vm_page.c Sun Oct 4 18:53:10 2009 (r197750)
@@ -135,8 +135,8 @@ __FBSDID("$FreeBSD$");
*/
struct vpgqueues vm_page_queues[PQ_COUNT];
-struct mtx vm_page_queue_mtx;
-struct mtx vm_page_queue_free_mtx;
+struct vpglocks vm_page_queue_lock;
+struct vpglocks vm_page_queue_free_lock;
I think you can do this by just:
struct mtx vm_page_queue_mtx __aligned(CACHE_LINE_SIZE);
without the need for a wrapper structure.
--
John Baldwin
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