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/ia64/include/pmap.h b/sys/ia64/include/pmap.h
index 44079c8..ff059fd 100644
--- a/sys/ia64/include/pmap.h
+++ b/sys/ia64/include/pmap.h
@@ -77,6 +77,8 @@ struct pmap {
 	TAILQ_HEAD(,pv_entry)	pm_pvlist;	/* list of mappings in pmap */
 	u_int32_t		pm_rid[5];	/* base RID for pmap */
 	struct pmap_statistics	pm_stats;	/* pmap statistics */
+	uint32_t		pm_gen_count;	/* generation count (pmap lock dropped) */
+	u_int			pm_retries;
 };
 
 typedef struct pmap	*pmap_t;