On Alan's advice, rather than do a wholesale conversion on a single

architecture from page queue lock to a hashed array of page locks
(based on a patch by Jeff Roberson), I've implemented page lock
support in the MI code and have only moved vm_page's hold_count
out from under page queue mutex to page lock. This changes
pmap_extract_and_hold on all pmaps.

Supported by: Bitgravity Inc.

Discussed with: alc, jeffr, and kib

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/powerpc/include/pmap.h b/sys/powerpc/include/pmap.h
index a23052e..a49bd6c 100644
--- a/sys/powerpc/include/pmap.h
+++ b/sys/powerpc/include/pmap.h
@@ -88,6 +88,8 @@ struct	pmap {
 	struct	mtx	pm_mtx;
 	u_int		pm_sr[16];
 	u_int		pm_active;
+	uint32_t	pm_gen_count;	/* generation count (pmap lock dropped) */
+	u_int		pm_retries;
 	u_int		pm_context;
 
 	struct pmap	*pmap_phys;