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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/ops_address.c
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/ops_address.c')
-rw-r--r--fs/gfs2/ops_address.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 37406a379e7..38dbe99a30e 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -646,7 +646,6 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
if (error)
goto out_unlock;
- ip->i_alloc.al_requested = 0;
if (alloc_required) {
al = gfs2_alloc_get(ip);
@@ -823,7 +822,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct buffer_head *dibh;
- struct gfs2_alloc *al = &ip->i_alloc;
+ struct gfs2_alloc *al = ip->i_alloc;
struct gfs2_dinode *di;
unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
unsigned int to = from + len;
@@ -861,7 +860,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
brelse(dibh);
gfs2_trans_end(sdp);
failed:
- if (al->al_requested) {
+ if (al) {
gfs2_inplace_release(ip);
gfs2_quota_unlock(ip);
gfs2_alloc_put(ip);