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authorSteven Whitehouse <swhiteho@redhat.com>2008-11-20 13:39:47 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2009-01-05 07:39:09 +0000
commit97cc1025b1a91c52e84f12478dcf0f853abc6564 (patch)
treecd71419049aeb13eea7012889d0ee0c715394e4d /fs/gfs2/daemon.c
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/daemon.c')
-rw-r--r--fs/gfs2/daemon.c61
1 files changed, 0 insertions, 61 deletions
diff --git a/fs/gfs2/daemon.c b/fs/gfs2/daemon.c
deleted file mode 100644
index 2662df0d5b9..00000000000
--- a/fs/gfs2/daemon.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
-
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/completion.h>
-#include <linux/buffer_head.h>
-#include <linux/kthread.h>
-#include <linux/delay.h>
-#include <linux/gfs2_ondisk.h>
-#include <linux/lm_interface.h>
-#include <linux/freezer.h>
-
-#include "gfs2.h"
-#include "incore.h"
-#include "daemon.h"
-#include "glock.h"
-#include "log.h"
-#include "recovery.h"
-#include "super.h"
-#include "util.h"
-
-/* This uses schedule_timeout() instead of msleep() because it's good for
- the daemons to wake up more often than the timeout when unmounting so
- the user's unmount doesn't sit there forever.
-
- The kthread functions used to start these daemons block and flush signals. */
-
-/**
- * gfs2_glockd - Reclaim unused glock structures
- * @sdp: Pointer to GFS2 superblock
- *
- * One or more of these daemons run, reclaiming glocks on sd_reclaim_list.
- * Number of daemons can be set by user, with num_glockd mount option.
- */
-
-int gfs2_glockd(void *data)
-{
- struct gfs2_sbd *sdp = data;
-
- while (!kthread_should_stop()) {
- while (atomic_read(&sdp->sd_reclaim_count))
- gfs2_reclaim_glock(sdp);
-
- wait_event_interruptible(sdp->sd_reclaim_wq,
- (atomic_read(&sdp->sd_reclaim_count) ||
- kthread_should_stop()));
- if (freezing(current))
- refrigerator();
- }
-
- return 0;
-}
-