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author | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-10 18:18:55 +0300 |
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committer | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-25 11:18:25 +0300 |
commit | 6dbd822487d0a9f14432cb4680415b80656b63a2 (patch) | |
tree | f0391d598c27cd7c39c67cfa13799a784f4c389a /fs/gfs2/bmap.c | |
parent | ac39aadd0440ae696e6dacaa8006ce1737b17008 (diff) | |
download | linux-6dbd822487d0a9f14432cb4680415b80656b63a2.tar.xz |
[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.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 224114166529..73dfad70de66 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; } |