svn commit: r227802 - head/sys/fs/tmpfs
Xin LI
delphij at FreeBSD.org
Mon Nov 21 20:26:22 UTC 2011
Author: delphij
Date: Mon Nov 21 20:26:22 2011
New Revision: 227802
URL: http://svn.freebsd.org/changeset/base/227802
Log:
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@
MFC after: 1 week
Modified:
head/sys/fs/tmpfs/tmpfs.h
Modified: head/sys/fs/tmpfs/tmpfs.h
==============================================================================
--- head/sys/fs/tmpfs/tmpfs.h Mon Nov 21 20:07:12 2011 (r227801)
+++ head/sys/fs/tmpfs/tmpfs.h Mon Nov 21 20:26:22 2011 (r227802)
@@ -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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