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| author | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-10 15:18:55 +0000 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-25 08:18:25 +0000 |
| commit | 6dbd822487d0a9f14432cb4680415b80656b63a2 (patch) | |
| tree | f0391d598c27cd7c39c67cfa13799a784f4c389a /fs/gfs2/rgrp.h | |
| parent | ac39aadd0440ae696e6dacaa8006ce1737b17008 (diff) | |
| download | linux-6dbd822487d0a9f14432cb4680415b80656b63a2.tar.bz2 | |
[GFS2] Reduce inode size by moving i_alloc out of line
It is possible to reduce the size of GFS2 inodes by taking the i_alloc
structure out of the gfs2_inode. This patch allocates the i_alloc
structure whenever its needed, and frees it afterward. This decreases
the amount of low memory we use at the expense of requiring a memory
allocation for each page or partial page that we write. A quick test
with postmark shows that the overhead is not measurable and I also note
that OCFS2 use the same approach.
In the future I'd like to solve the problem by shrinking down the size
of the members of the i_alloc structure, but for now, this reduces the
immediate problem of using too much low-memory on x86 and doesn't add
too much overhead.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.h')
| -rw-r--r-- | fs/gfs2/rgrp.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h index b4c6adfc6f2e..149bb161f4b6 100644 --- a/fs/gfs2/rgrp.h +++ b/fs/gfs2/rgrp.h @@ -32,7 +32,9 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd); struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip); static inline void gfs2_alloc_put(struct gfs2_inode *ip) { - return; /* So we can see where ip->i_alloc is used */ + BUG_ON(ip->i_alloc == NULL); + kfree(ip->i_alloc); + ip->i_alloc = NULL; } int gfs2_inplace_reserve_i(struct gfs2_inode *ip, |