aboutsummaryrefslogtreecommitdiffstats
path: root/fs/gfs2/rgrp.h
diff options
context:
space:
mode:
authorSteven Whitehouse <swhiteho@redhat.com>2008-01-10 10:18:55 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2008-01-25 03:18:25 -0500
commit6dbd822487d0a9f14432cb4680415b80656b63a2 (patch)
treef0391d598c27cd7c39c67cfa13799a784f4c389a /fs/gfs2/rgrp.h
parentac39aadd0440ae696e6dacaa8006ce1737b17008 (diff)
[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.h4
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);
32struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip); 32struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
33static inline void gfs2_alloc_put(struct gfs2_inode *ip) 33static inline void gfs2_alloc_put(struct gfs2_inode *ip)
34{ 34{
35 return; /* So we can see where ip->i_alloc is used */ 35 BUG_ON(ip->i_alloc == NULL);
36 kfree(ip->i_alloc);
37 ip->i_alloc = NULL;
36} 38}
37 39
38int gfs2_inplace_reserve_i(struct gfs2_inode *ip, 40int gfs2_inplace_reserve_i(struct gfs2_inode *ip,