Re: Scheduler and SMP

[Jiri Kosina]

On Sat, 13 Jun 2009, Bruno Bauer wrote:

> I'm new in kernel development and i be making tests in scheduler for a
> study course.

I guess kernelnewbies malinglist would be more appropriate for you than 
lkml.

> I created a new syscall that set a task for no migrate from cpu (I added 
> a new flag no_migrate on task_struct). 

Why didn't you use existing infrastructure (sched_setaffinity()) for that?

> In my tests, a tar/bzip task with no_migrate flag seted run at 5% more 
> fast.
> How do this be explained? Overhead of migration?

Probably. Depends on the exact changes you have made, which you haven't 
shared with us.

-- 
Jiri Kosina
SUSE Labs

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