diff options
Diffstat (limited to 'libpager/pager.h')
| -rw-r--r-- | libpager/pager.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/libpager/pager.h b/libpager/pager.h index 99fb3845..75ff108a 100644 --- a/libpager/pager.h +++ b/libpager/pager.h @@ -36,14 +36,17 @@ int pager_demuxer (mach_msg_header_t *inp, to receive requests. U_PAGER will be provided to later calls to pager_find_address. The pager will have one user reference created. MAY_CACHE and COPY_STRATEGY are the original values of - those attributes as for memory_object_ready. Users may create - references to pagers by use of the relevant ports library - functions. On errors, return null and set errno. */ + those attributes as for memory_object_ready. If NOTIFY_ON_EVICT is + non-zero, pager_notify_evict user callback will be called when page + is evicted. Users may create references to pagers by use of the + relevant ports library functions. On errors, return null and set + errno. */ struct pager * pager_create (struct user_pager_info *u_pager, struct port_bucket *bucket, boolean_t may_cache, - memory_object_copy_strategy_t copy_strategy); + memory_object_copy_strategy_t copy_strategy, + boolean_t notify_on_evict); /* Return the user_pager_info struct associated with a pager. */ struct user_pager_info * @@ -172,6 +175,18 @@ error_t pager_unlock_page (struct user_pager_info *pager, vm_offset_t address); +/* The user must define this function. It is used when you want be + able to change association of pages to backing store. To use it, + pass non-zero value in NOTIFY_ON_EVICT when pager is created with + pager_create. You can change association of page only when + pager_notify_evict has been called and you haven't touched page + content after that. Note there is a possibility that a page is + evicted, but user is not notified about that. The user should be + able to handle this case. */ +void +pager_notify_evict (struct user_pager_info *pager, + vm_offset_t page); + /* The user must define this function. It should report back (in *OFFSET and *SIZE the minimum valid address the pager will accept and the size of the object. */ |