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authorSteven Whitehouse <swhiteho@redhat.com>2008-11-20 08:39:47 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2009-01-05 02:39:09 -0500
commit97cc1025b1a91c52e84f12478dcf0f853abc6564 (patch)
treecd71419049aeb13eea7012889d0ee0c715394e4d /fs/gfs2/glock.h
parent9ac1b4d9b6f885ccd7d8f56bceb609003a920ff7 (diff)
GFS2: Kill two daemons with one patch
This patch removes the two daemons, gfs2_scand and gfs2_glockd and replaces them with a shrinker which is called from the VM. The net result is that GFS2 responds better when there is memory pressure, since it shrinks the glock cache at the same rate as the VFS shrinks the dcache and icache. There are no longer any time based criteria for shrinking glocks, they are kept until such time as the VM asks for more memory and then we demote just as many glocks as required. There are potential future changes to this code, including the possibility of sorting the glocks which are to be written back into inode number order, to get a better I/O ordering. It would be very useful to have an elevator based workqueue implementation for this, as that would automatically deal with the read I/O cases at the same time. This patch is my answer to Andrew Morton's remark, made during the initial review of GFS2, asking why GFS2 needs so many kernel threads, the answer being that it doesn't :-) This patch is a net loss of about 200 lines of code. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.h')
-rw-r--r--fs/gfs2/glock.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 13a64ee6523b..543ec7ecfbda 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -129,7 +129,6 @@ int gfs2_lvb_hold(struct gfs2_glock *gl);
129void gfs2_lvb_unhold(struct gfs2_glock *gl); 129void gfs2_lvb_unhold(struct gfs2_glock *gl);
130 130
131void gfs2_glock_cb(void *cb_data, unsigned int type, void *data); 131void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
132void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
133void gfs2_reclaim_glock(struct gfs2_sbd *sdp); 132void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
134void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); 133void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
135void gfs2_glock_finish_truncate(struct gfs2_inode *ip); 134void gfs2_glock_finish_truncate(struct gfs2_inode *ip);