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| author | Zhen Wei <zwei@novell.com> | 2006-12-08 00:48:17 -0700 |
|---|---|---|
| committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-12-28 16:40:32 -0800 |
| commit | 92efc15241ceebc23451691971897020e8563a70 (patch) | |
| tree | e9f5c8a43e61f7a9993fb962f3f4158ec46648c5 | |
| parent | 7f4a2a97e324e8c826d1d983bc8efb5c59194f02 (diff) | |
| download | linux-92efc15241ceebc23451691971897020e8563a70.tar.gz linux-92efc15241ceebc23451691971897020e8563a70.tar.bz2 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.c | 17 |
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, }; |