Re: [PATCH] sched_ext: Provide a sysfs enable_seq counter

[Tejun Heo <tj@kernel.org>]

On Sat, Sep 21, 2024 at 09:39:21PM +0200, andrea.righi@linux.dev wrote:
> From: Andrea Righi <andrea.righi@linux.dev>
> 
> As discussed during the distro-centric session within the sched_ext
> Microconference at LPC 2024, introduce a sequence counter that is
> incremented every time a BPF scheduler is loaded.
> 
> This feature can help distributions in diagnosing potential performance
> regressions by identifying systems where users are running (or have ran)
> custom BPF schedulers.
> 
> Example:
> 
>  arighi@virtme-ng~> cat /sys/kernel/sched_ext/enable_seq
>  0
>  arighi@virtme-ng~> sudo scx_simple
>  local=1 global=0
>  ^CEXIT: unregistered from user space
>  arighi@virtme-ng~> cat /sys/kernel/sched_ext/enable_seq
>  1
> 
> In this way user-space tools (such as Ubuntu's apport and similar) are
> able to gather and include this information in bug reports.
> 
> Cc: Giovanni Gherdovich <giovanni.gherdovich@suse.com>
> Cc: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
> Cc: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
> Cc: Phil Auld <pauld@redhat.com>
> Signed-off-by: Andrea Righi <andrea.righi@linux.dev>

Applied to sched_ext/for-6.12-fixes.

Thanks.

-- 
tejun