drop old patch series

1 files changed, 0 insertions, 346 deletions

diff --git a/debian/patches/vm-cache-policy0001-VM-cache-policy-change.patch b/debian/patches/vm-cache-policy0001-VM-cache-policy-change.patch
deleted file mode 100644
index 2fef1e2..0000000
--- a/debian/patches/vm-cache-policy0001-VM-cache-policy-change.patch
+++ /dev/null
@@ -1,346 +0,0 @@
-From dcbdadadcd006e6b9b8ced1dffa4d47a91557d08 Mon Sep 17 00:00:00 2001
-From: Richard Braun <rbraun@sceen.net>
-Date: Wed, 9 Oct 2013 11:51:54 +0200
-Subject: [PATCH gnumach 1/3] VM cache policy change
-
-This patch lets the kernel unconditionnally cache non empty unreferenced
-objects instead of using a fixed arbitrary limit. As the pageout daemon
-evicts pages, it collects cached objects that have become empty. The
-effective result is a graceful adjustment of the number of objects
-related to memory management (virtual memory objects, their associated
-ports, and potentially objects maintained in the external memory
-managers). Physical memory can now be almost entirely filled up with
-cached pages. In addition, these cached pages are not automatically
-deactivated as objects can quickly be referenced again.
-
-There are problems with this patch however. The first is that, on
-machines with a large amount of physical memory (above 1 GiB but it also
-depends on usage patterns), scalability issues are exposed. For example,
-file systems which don't throttle their writeback requests can create
-thread storms, strongly reducing system responsiveness. Other issues
-such as linear scans of memory objects also add visible CPU overhead.
-
-The second is that, as most memory is used, it increases the chances of
-swapping deadlocks. Applications that map large objects and quickly
-cause lots of page faults can still easily bring the system to its
-knees.
----
- vm/vm_object.c   | 166 ++++++++++++++++++-------------------------------------
- vm/vm_object.h   |   7 ++-
- vm/vm_pageout.c  |   7 ++-
- vm/vm_resident.c |   4 +-
- 4 files changed, 68 insertions(+), 116 deletions(-)
-
-diff --git a/vm/vm_object.c b/vm/vm_object.c
-index a026348..44c13f4 100644
---- a/vm/vm_object.c
-+++ b/vm/vm_object.c
-@@ -59,6 +59,11 @@
- #include <ddb/db_output.h>
- #endif	/* MACH_KDB */
- 
-+void memory_object_release(
-+	ipc_port_t	pager,
-+	pager_request_t	pager_request,
-+	ipc_port_t	pager_name); /* forward */
-+
- /*
-  *	Virtual memory objects maintain the actual data
-  *	associated with allocated virtual memory.  A given
-@@ -159,8 +164,9 @@ vm_object_t		kernel_object = &kernel_object_store;
-  *
-  *	The kernel may choose to terminate objects from this
-  *	queue in order to reclaim storage.  The current policy
-- *	is to permit a fixed maximum number of unreferenced
-- *	objects (vm_object_cached_max).
-+ *	is to let memory pressure dynamically adjust the number
-+ *	of unreferenced objects. The pageout daemon attempts to
-+ *	collect objects after removing pages from them.
-  *
-  *	A simple lock (accessed by routines
-  *	vm_object_cache_{lock,lock_try,unlock}) governs the
-@@ -176,7 +182,6 @@ vm_object_t		kernel_object = &kernel_object_store;
-  */
- queue_head_t	vm_object_cached_list;
- int		vm_object_cached_count;
--int		vm_object_cached_max = 4000;	/* may be patched*/
- 
- decl_simple_lock_data(,vm_object_cached_lock_data)
- 
-@@ -343,6 +348,33 @@ void vm_object_init(void)
- 			IKOT_PAGING_NAME);
- }
- 
-+void vm_object_collect(
-+	register vm_object_t	object)
-+{
-+	vm_object_unlock(object);
-+
-+	/*
-+	 *	The cache lock must be acquired in the proper order.
-+	 */
-+
-+	vm_object_cache_lock();
-+	vm_object_lock(object);
-+
-+	/*
-+	 *	If the object was referenced while the lock was
-+	 *	dropped, cancel the termination.
-+	 */
-+
-+	if (!vm_object_collectable(object)) {
-+		vm_object_unlock(object);
-+		vm_object_cache_unlock();
-+		return;
-+	}
-+
-+	queue_remove(&vm_object_cached_list, object, vm_object_t, cached_list);
-+	vm_object_terminate(object);
-+}
-+
- /*
-  *	vm_object_reference:
-  *
-@@ -403,103 +435,35 @@ void vm_object_deallocate(
- 
- 		/*
- 		 *	See whether this object can persist.  If so, enter
--		 *	it in the cache, then deactivate all of its
--		 *	pages.
-+		 *	it in the cache.
- 		 */
--		if (object->can_persist) {
--			boolean_t	overflow;
--
--			/*
--			 *	Enter the object onto the queue
--			 *	of "cached" objects.  Remember whether
--			 *	we've caused the queue to overflow,
--			 *	as a hint.
--			 */
--
-+		if (object->can_persist && (object->resident_page_count > 0)) {
- 			queue_enter(&vm_object_cached_list, object,
- 				vm_object_t, cached_list);
--			overflow = (++vm_object_cached_count > vm_object_cached_max);
-+			vm_object_cached_count++;
- 			vm_object_cached_pages_update(object->resident_page_count);
- 			vm_object_cache_unlock();
- 
--			vm_object_deactivate_pages(object);
- 			vm_object_unlock(object);
-+			return;
-+		}
- 
--			/*
--			 *	If we didn't overflow, or if the queue has
--			 *	been reduced back to below the specified
--			 *	minimum, then quit.
--			 */
--			if (!overflow)
--				return;
--
--			while (TRUE) {
--				vm_object_cache_lock();
--				if (vm_object_cached_count <=
--				    vm_object_cached_max) {
--					vm_object_cache_unlock();
--					return;
--				}
--
--				/*
--				 *	If we must trim down the queue, take
--				 *	the first object, and proceed to
--				 *	terminate it instead of the original
--				 *	object.	 Have to wait for pager init.
--				 *  if it's in progress.
--				 */
--				object= (vm_object_t)
--				    queue_first(&vm_object_cached_list);
--				vm_object_lock(object);
--
--				if (!(object->pager_created &&
--				    !object->pager_initialized)) {
--
--					/*
--					 *  Ok to terminate, hang on to lock.
--					 */
--					break;
--				}
--
--				vm_object_assert_wait(object,
--					VM_OBJECT_EVENT_INITIALIZED, FALSE);
--				vm_object_unlock(object);
--				vm_object_cache_unlock();
--				thread_block((void (*)()) 0);
--
--				/*
--				 *  Continue loop to check if cache still
--				 *  needs to be trimmed.
--				 */
--			}
-+		if (object->pager_created &&
-+		    !object->pager_initialized) {
- 
- 			/*
--			 *	Actually remove object from cache.
-+			 *	Have to wait for initialization.
-+			 *	Put reference back and retry
-+			 *	when it's initialized.
- 			 */
- 
--			queue_remove(&vm_object_cached_list, object,
--					vm_object_t, cached_list);
--			vm_object_cached_count--;
--
--			assert(object->ref_count == 0);
--		}
--		else {
--			if (object->pager_created &&
--			    !object->pager_initialized) {
--
--				/*
--				 *	Have to wait for initialization.
--				 *	Put reference back and retry
--				 *	when it's initialized.
--				 */
--				object->ref_count++;
--				vm_object_assert_wait(object,
--					VM_OBJECT_EVENT_INITIALIZED, FALSE);
--				vm_object_unlock(object);
--				vm_object_cache_unlock();
--				thread_block((void (*)()) 0);
--				continue;
--			  }
-+			object->ref_count++;
-+			vm_object_assert_wait(object,
-+				VM_OBJECT_EVENT_INITIALIZED, FALSE);
-+			vm_object_unlock(object);
-+			vm_object_cache_unlock();
-+			thread_block((void (*)()) 0);
-+			continue;
- 		}
- 
- 		/*
-@@ -862,28 +826,6 @@ kern_return_t memory_object_destroy(
- }
- 
- /*
-- *	vm_object_deactivate_pages
-- *
-- *	Deactivate all pages in the specified object.  (Keep its pages
-- *	in memory even though it is no longer referenced.)
-- *
-- *	The object must be locked.
-- */
--void vm_object_deactivate_pages(
--	vm_object_t	object)
--{
--	vm_page_t	p;
--
--	queue_iterate(&object->memq, p, vm_page_t, listq) {
--		vm_page_lock_queues();
--		if (!p->busy)
--			vm_page_deactivate(p);
--		vm_page_unlock_queues();
--	}
--}
--
--
--/*
-  *	Routine:	vm_object_pmap_protect
-  *
-  *	Purpose:
-@@ -2701,7 +2643,7 @@ void vm_object_page_remove(
- 	 *	It balances vm_object_lookup vs iteration.
- 	 */
- 
--	if (atop(end - start) < (unsigned)object->resident_page_count/16) {
-+	if (atop(end - start) < object->resident_page_count/16) {
- 		vm_object_page_remove_lookup++;
- 
- 		for (; start < end; start += PAGE_SIZE) {
-@@ -2926,7 +2868,7 @@ void vm_object_print(
- 	iprintf("Object 0x%X: size=0x%X, %d references\n",
- 		(vm_offset_t) object, (vm_offset_t) object->size,
- 		object->ref_count);
--	iprintf("%d resident pages,", object->resident_page_count);
-+	iprintf("%lu resident pages,", object->resident_page_count);
- 	 printf(" %d absent pages,", object->absent_count);
- 	 printf(" %d paging ops\n", object->paging_in_progress);
- 	indent += 1;
-diff --git a/vm/vm_object.h b/vm/vm_object.h
-index 3bfc67a..fa208aa 100644
---- a/vm/vm_object.h
-+++ b/vm/vm_object.h
-@@ -72,7 +72,7 @@ struct vm_object {
- 						 */
- 
- 	int			ref_count;	/* Number of references */
--	int			resident_page_count;
-+	unsigned long		resident_page_count;
- 						/* number of resident pages */
- 
- 	struct vm_object	*copy;		/* Object that should receive
-@@ -169,6 +169,7 @@ vm_object_t	kernel_object;		/* the single kernel object */
- 
- extern void		vm_object_bootstrap(void);
- extern void		vm_object_init(void);
-+extern void		vm_object_collect(vm_object_t);
- extern void		vm_object_terminate(vm_object_t);
- extern vm_object_t	vm_object_allocate(vm_size_t);
- extern void		vm_object_reference(vm_object_t);
-@@ -290,6 +291,10 @@ vm_object_t vm_object_copy_delayed(
-  *	Routines implemented as macros
-  */
- 
-+#define vm_object_collectable(object)					\
-+	(((object)->ref_count == 0)					\
-+	&& ((object)->resident_page_count == 0))
-+
- #define	vm_object_paging_begin(object) 					\
- 	((object)->paging_in_progress++)
- 
-diff --git a/vm/vm_pageout.c b/vm/vm_pageout.c
-index 51a6a0d..5e1ad1d 100644
---- a/vm/vm_pageout.c
-+++ b/vm/vm_pageout.c
-@@ -748,7 +748,12 @@ void vm_pageout_scan(void)
- 		    reclaim_page:
- 			vm_page_free(m);
- 			vm_page_unlock_queues();
--			vm_object_unlock(object);
-+
-+			if (vm_object_collectable(object))
-+				vm_object_collect(object);
-+			else
-+				vm_object_unlock(object);
-+
- 			continue;
- 		}
- 
-diff --git a/vm/vm_resident.c b/vm/vm_resident.c
-index c70fa73..b65b756 100644
---- a/vm/vm_resident.c
-+++ b/vm/vm_resident.c
-@@ -523,7 +523,7 @@ void vm_page_insert(
- 	 */
- 
- 	object->resident_page_count++;
--	assert(object->resident_page_count >= 0);
-+	assert(object->resident_page_count != 0);
- 
- 	if (object->can_persist && (object->ref_count == 0))
- 		vm_object_cached_pages_update(1);
-@@ -630,7 +630,7 @@ void vm_page_replace(
- 	 */
- 
- 	object->resident_page_count++;
--	assert(object->resident_page_count >= 0);
-+	assert(object->resident_page_count != 0);
- 
- 	if (object->can_persist && (object->ref_count == 0))
- 		vm_object_cached_pages_update(1);
--- 
-2.1.4
-