[Drbd-dev] [PATCH] drbd: standardize kthread/workqueue thread naming to include drbd minor number

[Lars Ellenberg]

On Mon, Jan 15, 2018 at 03:52:15PM -0800, Eric Wheeler wrote:
> From: Eric Wheeler <git at linux.ewheeler.net>
> 
> For DRBD resources with long names that start with the same prefix,
> it was difficult to find all process pids for that minor since names
> are truncated to the task_struct's comm field (16 bytes).
> 
> This patch names all processes associated with a DRBD device as drbdN_*
> where N is the DRBD minor in the same ways that the drbdN_submit workqueue
> is named.  Userspace tools can then lookup the name=>minor=>pid mapping
> and for all pids and use tools like chrt, ioprio, nice, add pids to
> cgroups, or for other useful purpose.


DRBD can do "multi volume" resources, which means most threads
are associated not with one, but with many minors.

"does not work just like that"

    Lars