linux-kernel - Re: [patch] don't preempt not TASK

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Date:	Fri, 20 Mar 2009 12:25:59 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mingo@...e.hu
CC:	miklos@...redi.hu, peterz@...radead.org, roland@...hat.com,
	efault@....de, rjw@...k.pl, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [patch] don't preempt not TASK_RUNNING tasks

On Fri, 20 Mar 2009, Ingo Molnar wrote:
> > > The first line of attack for this problem is making 
> > > wait_task_inactive() sucks less, which shouldn't be too hard, 
> > > that unconditional 1 jiffy sleep is simply retarded.
> > 
> > I completely agree.  However, I'd like to have a non-invasive 
> > solution that can go into current and stable kernels so UML users 
> > don't need to suffer any more.
> 
> Agreed. task_unlock_no_resched() should do that i think.

I don't see how that would help.

ptrace_stop() specifically would need read_unlock_no_resched().  But
I'm reluctant to add more spinlock functions with all their
variants...

Thanks,
Miklos
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