Re: 'autogroup' sched code KILLING responsiveness

[Michael Witten]

On Fri, Jan 21, 2011 at 16:27, Mike Galbraith <efault@xxxxxx> wrote:
> On Fri, 2011-01-21 at 10:20 -0800, Michael Witten wrote:
>> Bisecting shows that this commit:
>>
>> Â 5091faa449ee0b7d73bc296a93bca9540fc51d0a
>> Â sched: Add 'autogroup' scheduling feature: automated per session task groups
>> Â Date: Â Tue Nov 30 14:18:03 2010 +0100
>>
>> is the reason that my computer has become unusable.
>>
>> With that code in place, a resource-intensive activity (such as
>> compiling the Linux kernel) causes my computer to become
>> unresponsive for many seconds at a time; the entire screen
>> does not refresh, typed keys are dropped or are handled very
>> late, etc (even in Linux's plain virtual consoles).
>
> That's not what I'm experiencing with a UP kernel...

Before I try to gather any data, I'd like to point out that the
problem disappears when I disable CONFIG_SCHED_AUTOGROUP (General
setup -> Automatic process group scheduling).

Do you have it disabled?
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