[lc-checkins] CVS: linux/include/linux comp_cache.h,1.84,1.85 swap.h,1.14,1.15

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Update of /cvsroot/linuxcompressed/linux/include/linux
In directory usw-pr-cvs1:/tmp/cvs-serv26297/include/linux

Modified Files:
	comp_cache.h swap.h 
Log Message:
Features
o Some compressed cache functions (in particular the swap out ones)
have priority parameter now, which will passed from VM main
functions. The priority will show how far we should go on scanning
lists to free spaces in compressed cache.

o Fragments will not be decompressed when they are read from a read
ahead (for swap and page cache). In this case, we only check if the
fragment is in compressed cache. This police avoids LRU order to be
changed.

o Fragments will be removed from compressed cache if resize on demand
is enabled.

o Support for pages with buffers will only happen if resize on demand
is disabled.

Bug fixes
o Fixed potential bug in __find_lock_page() where we would decompress
a fragment and add a new page to page cache even if it had been
just swapped in.

Cleanups
o Added #ifdefs in lru queues functions.

o Several small cleanups

Other 
o compress_page() only returns the page in locked state if it has been
compressed. Otherwise, it will returned always unlocked.

o now get_comp_cache_page() doesn't try so hard to get an entry. The
maximum number of tries (which includes calls to writeout_fragments())
is 3.

Index: comp_cache.h
===================================================================
RCS file: /cvsroot/linuxcompressed/linux/include/linux/comp_cache.h,v
retrieving revision 1.84
retrieving revision 1.85
diff -C2 -r1.84 -r1.85
*** comp_cache.h	27 Jun 2002 13:17:37 -0000	1.84
--- comp_cache.h	1 Jul 2002 17:37:28 -0000	1.85
***************
*** 2,6 ****
   * linux/mm/comp_cache.h
   *
!  * Time-stamp: <2002-06-27 09:33:08 rcastro>
   *  
   * Linux Virtual Memory Compressed Cache
--- 2,6 ----
   * linux/mm/comp_cache.h
   *
!  * Time-stamp: <2002-07-01 13:09:35 rcastro>
   *  
   * Linux Virtual Memory Compressed Cache
***************
*** 314,318 ****
  extern int FASTCALL(flush_comp_cache(struct page *));

! int  read_comp_cache(struct address_space *, unsigned long, struct page *, int);
  int  invalidate_comp_cache(struct address_space *, unsigned long);
  void invalidate_comp_pages(struct address_space *);
--- 314,318 ----
  extern int FASTCALL(flush_comp_cache(struct page *));

! int  read_comp_cache(struct address_space *, unsigned long, struct page *);
  int  invalidate_comp_cache(struct address_space *, unsigned long);
  void invalidate_comp_pages(struct address_space *);
***************
*** 323,327 ****
  #define there_are_locked_comp_pages(mapping) (!list_empty(&(mapping)->locked_comp_pages))
  #else
! static inline int  read_comp_cache(struct address_space * mapping, unsigned long offset, struct page * page, int access) { return -ENOENT; }
  static inline int  invalidate_comp_cache(struct address_space * mapping, unsigned long offset) { return -ENOENT; }
  static inline int  flush_comp_cache(struct page * page) { return -ENOENT; }
--- 323,327 ----
  #define there_are_locked_comp_pages(mapping) (!list_empty(&(mapping)->locked_comp_pages))
  #else
! static inline int  read_comp_cache(struct address_space * mapping, unsigned long offset, struct page * page) { return -ENOENT; }
  static inline int  invalidate_comp_cache(struct address_space * mapping, unsigned long offset) { return -ENOENT; }
  static inline int  flush_comp_cache(struct page * page) { return -ENOENT; }
***************
*** 336,344 ****
  /* main.c */
  #ifdef CONFIG_COMP_CACHE
! int  compress_page(struct page *, int, unsigned int);
  void comp_cache_init(void);
  inline int init_comp_page(struct comp_cache_page **,struct page *);
! inline void  compress_dirty_page(struct page *, int (*writepage)(struct page *), unsigned int);
! inline int   compress_clean_page(struct page *, unsigned int);

  extern unsigned long comp_cache_free_space;
--- 336,344 ----
  /* main.c */
  #ifdef CONFIG_COMP_CACHE
! int  compress_page(struct page *, int, unsigned int, int);
  void comp_cache_init(void);
  inline int init_comp_page(struct comp_cache_page **,struct page *);
! inline void  compress_dirty_page(struct page *, int (*writepage)(struct page *), unsigned int, int);
! inline int   compress_clean_page(struct page *, unsigned int, int);

  extern unsigned long comp_cache_free_space;
***************
*** 346,358 ****
  #else
  static inline void comp_cache_init(void) {};
! static inline int  compress_dirty_page(struct page * page, int (*writepage)(struct page *), unsigned int gfp_mask) { return writepage(page); }
! static inline int  compress_clean_page(struct page * page, unsigned int gfp_mask) { return 1; }
  #endif

  #ifdef CONFIG_COMP_PAGE_CACHE
- int  comp_cache_try_to_release_page(struct page **, int);
  void steal_page_from_comp_cache(struct page *, struct page *);
  #else
! static inline int comp_cache_try_to_release_page(struct page ** page, int gfp_mask) { return try_to_release_page(*page, gfp_mask); }
  static inline void steal_page_from_comp_cache(struct page * page, struct page * new_page) {};
  #endif
--- 346,362 ----
  #else
  static inline void comp_cache_init(void) {};
! static inline int  compress_dirty_page(struct page * page, int (*writepage)(struct page *), unsigned int gfp_mask, int priority) { return writepage(page); }
! static inline int  compress_clean_page(struct page * page, unsigned int gfp_mask, int priority) { return 1; }
  #endif

  #ifdef CONFIG_COMP_PAGE_CACHE
  void steal_page_from_comp_cache(struct page *, struct page *);
+ #ifndef CONFIG_COMP_DEMAND_RESIZE
+ int  comp_cache_try_to_release_page(struct page **, int, int);
  #else
! static inline int comp_cache_try_to_release_page(struct page ** page, int gfp_mask, int priority) { return try_to_release_page(*page, gfp_mask); }
! #endif
! #else
! static inline int comp_cache_try_to_release_page(struct page ** page, int gfp_mask, int priority) { return try_to_release_page(*page, gfp_mask); }
  static inline void steal_page_from_comp_cache(struct page * page, struct page * new_page) {};
  #endif
***************
*** 546,552 ****
--- 550,558 ----
  /* enough memory functions */
  #ifdef CONFIG_COMP_CACHE
+ inline int in_comp_cache(struct address_space *, unsigned long);
  extern int FASTCALL(find_comp_page(struct address_space *, unsigned long, struct comp_cache_fragment **));
  #else
  static inline int find_comp_page(struct address_space * mapping, unsigned long offset, struct comp_cache_fragment ** fragment) { return -ENOENT; }
+ static inline int in_comp_cache(struct address_space * mapping, unsigned long offset) { return 0; }
  #endif

Index: swap.h
===================================================================
RCS file: /cvsroot/linuxcompressed/linux/include/linux/swap.h,v
retrieving revision 1.14
retrieving revision 1.15
diff -C2 -r1.14 -r1.15
*** swap.h	27 Feb 2002 14:16:52 -0000	1.14
--- swap.h	1 Jul 2002 17:37:29 -0000	1.15
***************
*** 140,144 ****
  extern void free_page_and_swap_cache(struct page *page);
  extern struct page * lookup_swap_cache(swp_entry_t);
! extern struct page * read_swap_cache_async(swp_entry_t);

  /* linux/mm/oom_kill.c */
--- 140,146 ----
  extern void free_page_and_swap_cache(struct page *page);
  extern struct page * lookup_swap_cache(swp_entry_t);
! extern struct page * __read_swap_cache_async(swp_entry_t, int);
! #define read_swap_cache_async(entry)       __read_swap_cache_async(entry, 0)
! #define read_swap_cache_async_ahead(entry) __read_swap_cache_async(entry, 1)

  /* linux/mm/oom_kill.c */