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* vm_copy_on_write_area() did not always correctly divide the ref_count of the

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two cache_refs - it needs to count the consumers of the lower cache to find
  its actual number of references; the upper cache could still be in use by
  someone else.
* There were several locking bugs in the VM code; since cache_ref::cache can
  change, we must not access it without having the cache_ref locked.
* As a result, map_backing_store() now requires you to have the lock of the
  store's cache_ref held.
* And therefore, some functions in vm_cache.c must no longer lock the cache_ref
  on their own, but require the caller to have it locked already.
* Added the -s option to the cache/cache_ref KDL commands: it will only print
  the requested structure, and not its counterpart (useful if accessing one
  structure results in a page fault, as was possible previously).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19796 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-01-14 18:41:57 +00:00
parent f445b04baf
commit 647b1f70a5
3 changed files with 191 additions and 113 deletions
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headers/private/kernel/vm_cache.h
+4 -4
View File
@@ -1,5 +1,5 @@
/*
* Copyright 2003-2006, Axel Dörfler, [email protected].
* Copyright 2003-2007, Axel Dörfler, [email protected].
* Distributed under the terms of the MIT License.
*
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
@@ -28,11 +28,11 @@ vm_page *vm_cache_lookup_page(vm_cache_ref *cacheRef, off_t page);
void vm_cache_insert_page(vm_cache_ref *cacheRef, vm_page *page, off_t offset);
void vm_cache_remove_page(vm_cache_ref *cacheRef, vm_page *page);
void vm_cache_remove_consumer(vm_cache_ref *cacheRef, vm_cache *consumer);
void vm_cache_add_consumer(vm_cache_ref *cacheRef, vm_cache *consumer);
void vm_cache_add_consumer_locked(vm_cache_ref *cacheRef, vm_cache *consumer);
status_t vm_cache_write_modified(vm_cache_ref *ref, bool fsReenter);
status_t vm_cache_set_minimal_commitment(vm_cache_ref *ref, off_t commitment);
status_t vm_cache_set_minimal_commitment_locked(vm_cache_ref *ref, off_t commitment);
status_t vm_cache_resize(vm_cache_ref *cacheRef, off_t newSize);
status_t vm_cache_insert_area(vm_cache_ref *cacheRef, vm_area *area);
status_t vm_cache_insert_area_locked(vm_cache_ref *cacheRef, vm_area *area);
status_t vm_cache_remove_area(vm_cache_ref *cacheRef, vm_area *area);
#ifdef __cplusplus