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authorSteven Whitehouse <swhiteho@redhat.com>2008-01-10 15:18:55 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2008-01-25 08:18:25 +0000
commit6dbd822487d0a9f14432cb4680415b80656b63a2 (patch)
treef0391d598c27cd7c39c67cfa13799a784f4c389a /fs/gfs2/rgrp.h
parentac39aadd0440ae696e6dacaa8006ce1737b17008 (diff)
downloadop-kernel-dev-6dbd822487d0a9f14432cb4680415b80656b63a2.zip
op-kernel-dev-6dbd822487d0a9f14432cb4680415b80656b63a2.tar.gz
[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 b4c6adf..149bb16 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,
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