From ff7333d33fdab4dc0e6809f8e70bdf82e2ed4637 Mon Sep 17 00:00:00 2001
From: alc <alc@FreeBSD.org>
Date: Tue, 13 Nov 2012 02:50:39 +0000
Subject: Replace the single, global page queues lock with per-queue locks on
 the active and inactive paging queues.

Reviewed by:	kib
---
 sys/vm/vm_page.h | 53 +++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 37 insertions(+), 16 deletions(-)

(limited to 'sys/vm/vm_page.h')

diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
index 70b8416..76cee03 100644
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -92,7 +92,7 @@
  *	In general, operations on this structure's mutable fields are
  *	synchronized using either one of or a combination of the lock on the
  *	object that the page belongs to (O), the pool lock for the page (P),
- *	or the lock for either the free or paging queues (Q).  If a field is
+ *	or the lock for either the free or paging queue (Q).  If a field is
  *	annotated below with two of these locks, then holding either lock is
  *	sufficient for read access, but both locks are required for write
  *	access.
@@ -111,8 +111,6 @@
  *	field is encapsulated in vm_page_clear_dirty_mask().
  */
 
-TAILQ_HEAD(pglist, vm_page);
-
 #if PAGE_SIZE == 4096
 #define VM_PAGE_BITS_ALL 0xffu
 typedef uint8_t vm_page_bits_t;
@@ -128,7 +126,7 @@ typedef uint64_t vm_page_bits_t;
 #endif
 
 struct vm_page {
-	TAILQ_ENTRY(vm_page) pageq;	/* queue info for FIFO queue or free list (Q) */
+	TAILQ_ENTRY(vm_page) pageq;	/* page queue or free list (Q)	*/
 	TAILQ_ENTRY(vm_page) listq;	/* pages in same object (O) 	*/
 	struct vm_page *left;		/* splay tree link (O)		*/
 	struct vm_page *right;		/* splay tree link (O)		*/
@@ -180,12 +178,22 @@ struct vm_page {
 #define	PQ_ACTIVE	1
 #define	PQ_COUNT	2
 
-struct vpgqueues {
-	struct pglist pl;
-	int	*cnt;
-};
+TAILQ_HEAD(pglist, vm_page);
+
+struct vm_pagequeue {
+	struct mtx	pq_mutex;
+	struct pglist	pq_pl;
+	int *const	pq_cnt;
+	const char *const pq_name;
+} __aligned(CACHE_LINE_SIZE);
 
-extern struct vpgqueues vm_page_queues[PQ_COUNT];
+extern struct vm_pagequeue vm_pagequeues[PQ_COUNT];
+
+#define	vm_pagequeue_assert_locked(pq)	mtx_assert(&(pq)->pq_mutex, MA_OWNED)
+#define	vm_pagequeue_init_lock(pq)	mtx_init(&(pq)->pq_mutex,	\
+	    (pq)->pq_name, "vm pagequeue", MTX_DEF | MTX_DUPOK);
+#define	vm_pagequeue_lock(pq)		mtx_lock(&(pq)->pq_mutex)
+#define	vm_pagequeue_unlock(pq)		mtx_unlock(&(pq)->pq_mutex)
 
 extern struct mtx_padalign vm_page_queue_free_mtx;
 extern struct mtx_padalign pa_lock[];
@@ -320,11 +328,6 @@ vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
 
 vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
 
-extern struct mtx_padalign vm_page_queue_mtx;
-
-#define vm_page_lock_queues()   mtx_lock(&vm_page_queue_mtx)
-#define vm_page_unlock_queues() mtx_unlock(&vm_page_queue_mtx)
-
 /* page allocation classes: */
 #define VM_ALLOC_NORMAL		0
 #define VM_ALLOC_INTERRUPT	1
@@ -354,8 +357,6 @@ void vm_page_free(vm_page_t m);
 void vm_page_free_zero(vm_page_t m);
 void vm_page_wakeup(vm_page_t m);
 
-void vm_pageq_remove(vm_page_t m);
-
 void vm_page_activate (vm_page_t);
 vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int);
 vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req,
@@ -370,6 +371,8 @@ int vm_page_try_to_cache (vm_page_t);
 int vm_page_try_to_free (vm_page_t);
 void vm_page_dontneed(vm_page_t);
 void vm_page_deactivate (vm_page_t);
+void vm_page_dequeue(vm_page_t m);
+void vm_page_dequeue_locked(vm_page_t m);
 vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t);
 vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr);
 void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
@@ -384,6 +387,8 @@ void vm_page_readahead_finish(vm_page_t m);
 void vm_page_reference(vm_page_t m);
 void vm_page_remove (vm_page_t);
 void vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t);
+void vm_page_requeue(vm_page_t m);
+void vm_page_requeue_locked(vm_page_t m);
 void vm_page_set_valid_range(vm_page_t m, int base, int size);
 void vm_page_sleep(vm_page_t m, const char *msg);
 vm_page_t vm_page_splay(vm_pindex_t, vm_page_t);
@@ -512,6 +517,22 @@ vm_page_dirty(vm_page_t m)
 }
 
 /*
+ *	vm_page_remque:
+ *
+ *	If the given page is in a page queue, then remove it from that page
+ *	queue.
+ *
+ *	The page must be locked.
+ */
+static inline void
+vm_page_remque(vm_page_t m)
+{
+
+	if (m->queue != PQ_NONE)
+		vm_page_dequeue(m);
+}
+
+/*
  *	vm_page_sleep_if_busy:
  *
  *	Sleep and release the page queues lock if VPO_BUSY is set or,
-- 
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