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* Since the page scanner and thief can work more effectively when no vm_caches

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are locked, there is now a vm_page_reserve_pages() call to ensure upfront that
  there is a page for me when I need it, and may have locked some caches.
* The vm_soft_fault() routine now makes use of that feature.
* vm_page_allocate_page() now resets the vm_page::usage_count, so that the file
  cache does not need to do this in read_chunk_into_cache() and
  write_chunk_to_cache().
* In cache_io() however, it need to update the usage_count - and it does that
  now. Since non-mapped caches don't have mappings, the page scanner will punish
  the cache pages stronger than other pages which is accidently just what we
  want.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22319 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-09-26 17:42:25 +00:00
parent 8a25e1293b
commit 8e0f884c71
6 changed files with 89 additions and 41 deletions
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headers/private/kernel/vm_page.h
+4 -1
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@@ -34,7 +34,10 @@ size_t vm_page_num_free_pages(void);
status_t vm_page_write_modified(vm_cache *cache, bool fsReenter);
vm_page *vm_page_allocate_page(int state);
void vm_page_unreserve_pages(uint32 count);
void vm_page_reserve_pages(uint32 count);
vm_page *vm_page_allocate_page(int pageState, bool reserved);
status_t vm_page_allocate_pages(int pageState, vm_page **pages, uint32 numPages);
vm_page *vm_page_allocate_page_run(int state, addr_t length);
vm_page *vm_page_at_index(int32 index);