Author: delphij
Date: Mon Apr 2 07:18:31 2012
New Revision: 233769
URL: http://svn.freebsd.org/changeset/base/233769
Log:
MFC r227802:
Improve the way to calculate available pages in tmpfs:
- Don't deduct wired pages from total usable counts because it does not
make any sense. To make things worse, on systems where swap size is
smaller than physical memory and use a lot of wired pages (e.g. ZFS),
tmpfs can suddenly have free space of 0 because of this;
- Count cached pages as available; [1]
- Don't count inactive pages as available, technically we could but that
might be too aggressive; [1]
[1] Suggested by kib@
Modified:
stable/9/sys/fs/tmpfs/tmpfs.h
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/fs/ (props changed)
Modified: stable/9/sys/fs/tmpfs/tmpfs.h
==============================================================================
--- stable/9/sys/fs/tmpfs/tmpfs.h Mon Apr 2 02:22:22 2012
(r233768)
+++ stable/9/sys/fs/tmpfs/tmpfs.h Mon Apr 2 07:18:31 2012
(r233769)
@@ -502,11 +502,8 @@ int tmpfs_truncate(struct vnode *, off_t
static __inline size_t
tmpfs_mem_info(void)
{
- size_t size;
- size = swap_pager_avail + cnt.v_free_count + cnt.v_inactive_count;
- size -= size > cnt.v_wire_count ? cnt.v_wire_count : size;
- return size;
+ return (swap_pager_avail + cnt.v_free_count + cnt.v_cache_count);
}
/* Returns the maximum size allowed for a tmpfs file system. This macro
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