Kumar Gala <[email protected]> writes:
> On Feb 19, 2007, at 4:19 PM, OGAWA Hirofumi wrote:
>
>> Kumar Gala <[email protected]> writes:
>>
>>> Once the system locks up I dont have any ability to do anything.
>>
>> Ah, doesn't sysrq also work? If sysrq work, it can use to see IO
>> request state with a patch.
>
> Yeah, got sysrq working today. If you can point me at the patch I
> happy to apply it and get data.
Ok, please try attached patch. I hope it helps you.
BTW, new sysrq is sysrq-j, and it will show disk stats.
--
OGAWA Hirofumi <[email protected]>
Signed-off-by: OGAWA Hirofumi <[email protected]>
---
block/genhd.c | 27 +++++++++++++++++++++++++++
drivers/char/sysrq.c | 15 ++++++++++++++-
2 files changed, 41 insertions(+), 1 deletion(-)
diff -puN drivers/char/sysrq.c~debug-block drivers/char/sysrq.c
--- linux-2.6/drivers/char/sysrq.c~debug-block 2007-02-21 00:58:35.000000000 +0900
+++ linux-2.6-hirofumi/drivers/char/sysrq.c 2007-02-21 02:02:52.000000000 +0900
@@ -311,6 +311,19 @@ static struct sysrq_key_op sysrq_kill_op
.enable_mask = SYSRQ_ENABLE_SIGNAL,
};
+extern void block_req_callback(struct work_struct *ignored);
+static DECLARE_WORK(block_req_work, block_req_callback);
+static void sysrq_handle_block_req(int key, struct tty_struct *tty)
+{
+ schedule_work(&block_req_work);
+}
+static struct sysrq_key_op sysrq_block_req_op = {
+ .handler = sysrq_handle_block_req,
+ .help_msg = "block req (j)",
+ .action_msg = "Block Req",
+ .enable_mask = SYSRQ_ENABLE_DUMP,
+};
+
static void sysrq_handle_unrt(int key, struct tty_struct *tty)
{
normalize_rt_tasks();
@@ -351,7 +364,7 @@ static struct sysrq_key_op *sysrq_key_ta
NULL, /* g */
NULL, /* h */
&sysrq_kill_op, /* i */
- NULL, /* j */
+ &sysrq_block_req_op, /* j */
&sysrq_SAK_op, /* k */
NULL, /* l */
&sysrq_showmem_op, /* m */
diff -puN block/genhd.c~debug-block block/genhd.c
--- linux-2.6/block/genhd.c~debug-block 2007-02-21 01:02:13.000000000 +0900
+++ linux-2.6-hirofumi/block/genhd.c 2007-02-21 02:15:56.000000000 +0900
@@ -555,6 +555,33 @@ static struct kset_uevent_ops block_ueve
decl_subsys(block, &ktype_block, &block_uevent_ops);
+void block_req_callback(struct work_struct *ignored)
+{
+ struct gendisk *gp;
+ char buf[BDEVNAME_SIZE];
+
+ mutex_lock(&block_subsys_lock);
+ list_for_each_entry(gp, &block_subsys.kset.list, kobj.entry) {
+ printk("%4d %4d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u:"
+ " %u %u %u\n",
+ gp->major, gp->first_minor, disk_name(gp, 0, buf),
+ disk_stat_read(gp, ios[0]),
+ disk_stat_read(gp, merges[0]),
+ (unsigned long long)disk_stat_read(gp, sectors[0]),
+ jiffies_to_msecs(disk_stat_read(gp, ticks[0])),
+ disk_stat_read(gp, ios[1]),
+ disk_stat_read(gp, merges[1]),
+ (unsigned long long)disk_stat_read(gp, sectors[1]),
+ jiffies_to_msecs(disk_stat_read(gp, ticks[1])),
+ gp->in_flight,
+ jiffies_to_msecs(disk_stat_read(gp, io_ticks)),
+ jiffies_to_msecs(disk_stat_read(gp, time_in_queue)),
+ gp->queue->rq.count[0], gp->queue->rq.count[1],
+ gp->queue->in_flight);
+ }
+ mutex_unlock(&block_subsys_lock);
+}
+
/*
* aggregate disk stat collector. Uses the same stats that the sysfs
* entries do, above, but makes them available through one seq_file.
_
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