On Wed, Jul 12, 2017 at 10:57:37AM -0600, Jens Axboe wrote:

On 07/12/2017 10:54 AM, weiping zhang wrote:

quoted

A mapping show as following:

hctx		cpus
hctx0		  0   1
hctx1		  2
hctx2		  3
hctx3		  4   5

We already have that information in the /sys/block/<dev>/mq/X/cpu_list

where X is the hardware queue number. Why do we need it in debugfs as
well, presented differently?

this arribute give a more obviously showing, only by 1 "cat" command.
/sys/bloc/<dev>/mq/X/cpu_list not easy get mapping for all hctx by 1
command.
also /sys/kernel/debug/block/xxx/hctxN/cpuX can export that info, but
these two methods both not obviously.