linux-kernel - Re: [RFC 60/60] cosched: Add command line argument to enable coscheduling

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Date:   Sun, 9 Sep 2018 19:50:40 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jan H. Schönherr <jschoenh@...zon.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [RFC 60/60] cosched: Add command line argument to enable
 coscheduling

On 9/7/18 2:40 PM, Jan H. Schönherr wrote:
> Add a new command line argument cosched_max_level=<n>, which allows
> enabling coscheduling at boot. The number corresponds to the scheduling
> domain up to which coscheduling can later be enabled for cgroups.
> 
> For example, to enable coscheduling of cgroups at SMT level, one would
> specify cosched_max_level=1.
> 
> The use of symbolic names (like off, core, socket, system) is currently
> not possible, but could be added. However, to force coscheduling at up
> to system level not knowing the scheduling domain topology in advance,
> it is possible to just specify a too large number. It will be clamped
> transparently to system level.
> 
> Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de>
> ---
>  kernel/sched/cosched.c | 32 +++++++++++++++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/cosched.c b/kernel/sched/cosched.c
> index eb6a6a61521e..a1f0d3a7b02a 100644
> --- a/kernel/sched/cosched.c
> +++ b/kernel/sched/cosched.c
> @@ -162,6 +162,29 @@ static int __init cosched_split_domains_setup(char *str)
>  
>  early_param("cosched_split_domains", cosched_split_domains_setup);
>  

> +
> +early_param("cosched_max_level", cosched_max_level_setup);
> +

Hi,
Please document both of these kernel parameters in
Documentation/admin-guide/kernel-parameters.txt.

thanks,
-- 
~Randy