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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/bmap.c
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/bmap.c')
-rw-r--r--fs/gfs2/bmap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 2241141..73dfad7 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -683,7 +683,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
if (metadata)
revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
- error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
+ error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
if (error)
return error;
@@ -785,7 +785,7 @@ out_rg_gunlock:
out_rlist:
gfs2_rlist_free(&rlist);
out:
- gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
+ gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
return error;
}
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