[dm-devel] dm crypt: export sysfs of kcryptd workqueue

[Mike Snitzer]

On Tue, Dec 01 2020 at 11:04pm -0500,
JeffleXu <jefflexu at linux.alibaba.com> wrote:

> Hi Mike,
> 
> What about this patch?
> 
> On 11/30/20 7:33 PM, Jeffle Xu wrote:
> > It should be helpful to export sysfs of "kcryptd" workqueue in some
> > cases, such as setting specific CPU affinity of the workqueue.
> > 
> > Besides, also tweak the name format a little. The slash inside a
> > directory name will be translate into exclamation mark, such as
> > /sys/devices/virtual/workqueue/'kcryptd!253:0'.
> > 
> > Signed-off-by: Jeffle Xu <jefflexu at linux.alibaba.com>
> > ---
> >  drivers/md/dm-crypt.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
> > index 392337f16ecf..6b4c1f674239 100644
> > --- a/drivers/md/dm-crypt.c
> > +++ b/drivers/md/dm-crypt.c
> > @@ -3166,11 +3166,12 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> >  	}
> >  
> >  	if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
> > -		cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
> > +		cc->crypt_queue = alloc_workqueue("kcryptd-%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
> >  						  1, devname);
> >  	else
> > -		cc->crypt_queue = alloc_workqueue("kcryptd/%s",
> > -						  WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
> > +		cc->crypt_queue = alloc_workqueue("kcryptd-%s",
> > +						  WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM |
> > +						  WQ_UNBOUND | WQ_SYSFS,
> >  						  num_online_cpus(), devname);
> >  	if (!cc->crypt_queue) {
> >  		ti->error = "Couldn't create kcryptd queue";
> > 

Looks fine, I'll get it staged for 5.11.

Mike