Re: Cache Allocation Technology Design

Peter Zijlstra
2014-10-29T18:16:59Z

On Wed, Oct 29, 2014 at 10:26:16AM -0700, Vikas Shivappa wrote:
> >It appears to me this 'mode' thing is entirely superfluous and can be
> >constructed by voluntary operation of this and cpusets or manual
> >affinity calls.
>
> Do you mean user would would just user the cpusets for cpu affinity and CAT
> cgroup for cache allocation as shown in example below ?
>
> In other words say affinitize the PID1 and PID2 to CPUs 1 and 2
> and then set the desired cache allocation as well like below - then we have
> the desired cpu affinity and cache allocation for these PIDs..
>
> cd /sys/fs/cgroup/cpuset
>
> mkdir group1_specialuse
> /bin/echo 1-2 > cpuset.cpus
> /bin/echo PID1 > tasks
> /bin/echo PID2 > tasks
>
> Now come to CAT and do the cache allocation for the same tasks PID1 and
> PID2.
>
> cd /sys/fs/cgroup/cat (CAT cgroup)
>
> mkdir group1_specialuse (keeping same name just for understanding)
> /bin/echo 0xf > cat.cbm (set the cache bit mask)
> /bin/echo PID1 > tasks
> /bin/echo PID2 > tasks
>

Yah, except I have a strong urge to mount cpusets under /dog when you
put it like that ;-)

Or co-mount cpusets and pets and do it that way.