On 01/23/2017 07:59 PM, Omar Sandoval wrote:
> From: Omar Sandoval <osandov@xxxxxx>
>
> hctx->state could come in handy for bugs where the hardware queue gets
> stuck in the stopped state, and hctx->flags is just useful to know.
>
> Signed-off-by: Omar Sandoval <osandov@xxxxxx>
> ---
> block/blk-mq-debugfs.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
Hehe. I've found myself adding exactly the same attributes when
debugging mq-deadline :-)
> diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
> index 01711bbf5ade..0c14511fa9e0 100644
> --- a/block/blk-mq-debugfs.c
> +++ b/block/blk-mq-debugfs.c
> @@ -29,7 +29,49 @@ struct blk_mq_debugfs_attr {
>
> static struct dentry *block_debugfs_root;
>
> +static int hctx_state_show(struct seq_file *m, void *v)
> +{
> + struct blk_mq_hw_ctx *hctx = m->private;
> +
> + seq_printf(m, "0x%lx\n", hctx->state);
> + return 0;
> +}
> +
What about decoding it?
Would make life so much easier, and one doesn't have to have a kernel
source tree available when looking things up...
> +static int hctx_state_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, hctx_state_show, inode->i_private);
> +}
> +
> +static const struct file_operations hctx_state_fops = {
> + .open = hctx_state_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> +};
> +
> +static int hctx_flags_show(struct seq_file *m, void *v)
> +{
> + struct blk_mq_hw_ctx *hctx = m->private;
> +
> + seq_printf(m, "0x%lx\n", hctx->flags);
> + return 0;
> +}
> +
Same argument here.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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