lkml.org 
[lkml]   [2008]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] Customize sched domain via cpuset
Peter Zijlstra wrote:
> On Tue, 2008-04-01 at 20:27 +0900, Hidetoshi Seto wrote:
>> The implementation is here.
>>
>> - Add 2 new cpuset files:
>> sched_wake_idle_far
>> sched_balance_newidle_far
>>
>> - Modify partition_sched_domains() and build_sched_domains()
>> to take flags parameter passed from cpuset.
>>
>> - Fill newidle_idx for node domains which currently unused but
>> might be required for sched_balance_newidle_far.
>
> Just to be clear; the same effect can be had by poking into:
>
> /proc/sys/kernel/sched_domain/$cpu/$domain/flags
>
> but this interface you now propose gives a more stable interface in that
> you'd have to re-do your setting after every cpuset change (admittedly
> those are rare, but I see how it could be a nuisance).

And the sysctl entry "sched_domain" is not available unless SCHED_DEBUG.

So it is common sense that this sysctl is not open to public yet,
and that the expected users are scheduler developers, Ingo and friends.

> Or do you actually add something that wasn't available through the
> initial domain interface?

At this time I have no idea, but it would be possible if there are
something unreasonable on global system but acceptable on a part.

In other words, we can invent other sched_* families which has special
effect that "default scheduler" never have.

Thanks,
H.Seto


\
 
 \ /
  Last update: 2008-04-02 10:45    [W:0.069 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site