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authorZhen Wei <zwei@novell.com>2006-12-08 00:48:17 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2006-12-28 16:40:32 -0800
commit92efc15241ceebc23451691971897020e8563a70 (patch)
treee9f5c8a43e61f7a9993fb962f3f4158ec46648c5
parent7f4a2a97e324e8c826d1d983bc8efb5c59194f02 (diff)
downloadblackbird-op-linux-92efc15241ceebc23451691971897020e8563a70.tar.gz
blackbird-op-linux-92efc15241ceebc23451691971897020e8563a70.zip
ocfs2: export heartbeat thread pid via configfs
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@novell.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
-rw-r--r--fs/ocfs2/cluster/heartbeat.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index a25ef5a50386..277ca67a2ad6 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1447,6 +1447,15 @@ 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 *);
@@ -1485,11 +1494,19 @@ static struct o2hb_region_attribute o2hb_region_attr_dev = {
.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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