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| author | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-10 18:18:55 +0300 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2008-01-25 11:18:25 +0300 |
| commit | 6dbd822487d0a9f14432cb4680415b80656b63a2 (patch) | |
| tree | f0391d598c27cd7c39c67cfa13799a784f4c389a /fs/gfs2/quota.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/quota.c')
| -rw-r--r-- | fs/gfs2/quota.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c index 60cc50fe15b4..a08dabd6ce90 100644 --- a/fs/gfs2/quota.c +++ b/fs/gfs2/quota.c @@ -453,7 +453,7 @@ static void qdsb_put(struct gfs2_quota_data *qd) int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data **qd = al->al_qd; int error; @@ -501,7 +501,7 @@ out: void gfs2_quota_unhold(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; unsigned int x; gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); @@ -853,7 +853,7 @@ fail: int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; unsigned int x; int error = 0; @@ -921,7 +921,7 @@ static int need_sync(struct gfs2_quota_data *qd) void gfs2_quota_unlock(struct gfs2_inode *ip) { - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qda[4]; unsigned int count = 0; unsigned int x; @@ -969,7 +969,7 @@ static int print_message(struct gfs2_quota_data *qd, char *type) int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qd; s64 value; unsigned int x; @@ -1013,7 +1013,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) void gfs2_quota_change(struct gfs2_inode *ip, s64 change, u32 uid, u32 gid) { - struct gfs2_alloc *al = &ip->i_alloc; + struct gfs2_alloc *al = ip->i_alloc; struct gfs2_quota_data *qd; unsigned int x; |