diff options
Diffstat (limited to 'ext2fs/pager.c')
| -rw-r--r-- | ext2fs/pager.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/ext2fs/pager.c b/ext2fs/pager.c index ff42ab63..9ff36205 100644 --- a/ext2fs/pager.c +++ b/ext2fs/pager.c @@ -68,8 +68,11 @@ do { spin_lock (&ext2s_pager_stats.lock); \ #define STAT_INC(field) /* nop */0 #endif /* STATS */ +#define MAX_FREE_PAGE_BUFS 32 + static spin_lock_t free_page_bufs_lock = SPIN_LOCK_INITIALIZER; static void *free_page_bufs = 0; +static int num_free_page_bufs = 0; /* Returns a single page page-aligned buffer. */ static void * @@ -92,6 +95,7 @@ get_page_buf () else { free_page_bufs = *(void **)buf; + num_free_page_bufs--; spin_unlock (&free_page_bufs_lock); } @@ -103,9 +107,18 @@ static void free_page_buf (void *buf) { spin_lock (&free_page_bufs_lock); - *(void **)buf = free_page_bufs; - free_page_bufs = buf; - spin_unlock (&free_page_bufs_lock); + if (num_free_page_bufs < MAX_FREE_PAGE_BUFS) + { + *(void **)buf = free_page_bufs; + free_page_bufs = buf; + num_free_page_bufs++; + spin_unlock (&free_page_bufs_lock); + } + else + { + spin_unlock (&free_page_bufs_lock); + vm_deallocate (mach_task_self (), (vm_address_t *)buf, vm_page_size); + } } /* Find the location on disk of page OFFSET in NODE. Return the disk block |