Author: alc
Date: Sat Jun 2 22:14:10 2012
New Revision: 236494
URL: http://svn.freebsd.org/changeset/base/236494
Log:
Isolate the global pv list lock from data and other locks to prevent false
sharing within the cache.
Modified:
head/sys/amd64/amd64/pmap.c
head/sys/i386/i386/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Sat Jun 2 21:22:26 2012 (r236493)
+++ head/sys/amd64/amd64/pmap.c Sat Jun 2 22:14:10 2012 (r236494)
@@ -200,12 +200,22 @@ static u_int64_t DMPDphys; /* phys addr
static u_int64_t DMPDPphys; /* phys addr of direct mapped level 3 */
/*
+ * Isolate the global pv list lock from data and other locks to prevent false
+ * sharing within the cache.
+ */
+static struct {
+ struct rwlock lock;
+ char padding[CACHE_LINE_SIZE - sizeof(struct rwlock)];
+} pvh_global __aligned(CACHE_LINE_SIZE);
+
+#define pvh_global_lock pvh_global.lock
+
+/*
* Data for the pv entry allocation mechanism
*/
static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks);
static long pv_entry_count;
static struct md_page *pv_table;
-static struct rwlock pvh_global_lock;
/*
* All those kernel PT submaps that BSD is so fond of
Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c Sat Jun 2 21:22:26 2012 (r236493)
+++ head/sys/i386/i386/pmap.c Sat Jun 2 22:14:10 2012 (r236494)
@@ -232,12 +232,22 @@ SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_ena
static int pat_index[PAT_INDEX_SIZE]; /* cache mode to PAT index conversion */
/*
+ * Isolate the global pv list lock from data and other locks to prevent false
+ * sharing within the cache.
+ */
+static struct {
+ struct rwlock lock;
+ char padding[CACHE_LINE_SIZE - sizeof(struct rwlock)];
+} pvh_global __aligned(CACHE_LINE_SIZE);
+
+#define pvh_global_lock pvh_global.lock
+
+/*
* Data for the pv entry allocation mechanism
*/
static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks);
static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
static struct md_page *pv_table;
-static struct rwlock pvh_global_lock;
static int shpgperproc = PMAP_SHPGPERPROC;
struct pv_chunk *pv_chunkbase; /* KVA block for pv_chunks */
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
