[Ocfs2-devel] [patch 1/3]OCFS2: allow the ocfs2 heartbeat thread to
prioritize I/O --revision 3
Zhen Wei
zwei at novell.com
Thu Dec 7 23:48:17 PST 2006
From: Zhen Wei <zwei at novell.com>
Subject: allow the ocfs2 heartbeat thread to prioritize I/O
Patch-mainline: 2.6.19
The patch allows the ocfs2 heartbeat thread to prioritize I/O which may
help cut down on spurious fencing. Most of this will be in the tools -
we can have a pid configfs attribute and let userspace (ocfs2_hb_ctl)
calls the ioprio_set syscall after starting heartbeat, but only cfq
scheduler supports I/O priorities now.
Signed-off-by: Zhen Wei <zwei at novell.com>
zhen wei
zwei at novell.com
+86 10 65339225
-------------- next part --------------
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 305cba3..8b8ce0f 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1445,6 +1445,15 @@ out:
return ret;
}
+static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
+ char *page)
+{
+ if (!reg->hr_task)
+ return 0;
+
+ return sprintf(page, "%u\n", reg->hr_task->pid);
+}
+
struct o2hb_region_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct o2hb_region *, char *);
@@ -1483,11 +1492,19 @@ static struct o2hb_region_attribute o2hb
.store = o2hb_region_dev_write,
};
+static struct o2hb_region_attribute o2hb_region_attr_pid = {
+ .attr = { .ca_owner = THIS_MODULE,
+ .ca_name = "pid",
+ .ca_mode = S_IRUGO | S_IRUSR },
+ .show = o2hb_region_pid_read,
+};
+
static struct configfs_attribute *o2hb_region_attrs[] = {
&o2hb_region_attr_block_bytes.attr,
&o2hb_region_attr_start_block.attr,
&o2hb_region_attr_blocks.attr,
&o2hb_region_attr_dev.attr,
+ &o2hb_region_attr_pid.attr,
NULL,
};
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