From d4d93723f01dbe8768e7fac92ce8e655aa499f0a Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Wed, 16 Jun 1999 16:56:40 +0000 Subject: Tue Jun 15 21:51:58 1999 Thomas Bushnell, BSG * pager.c: Clamp the number of free pages we keep around to some reasonably small value. Patch from Mark Kettenis . 1999-06-15 Thomas Bushnell, BSG * inode.c (diskfs_validate_flags_change): Invert sense of test wrt bits that haven't yet been defined. Reported by Kalle Olavi Niemitalo . --- ext2fs/pager.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) (limited to 'ext2fs/pager.c') 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 -- cgit v1.2.3