Re: kmemleak: Protect the seq start/next/stop sequence by rcu_read_lock()

[Catalin Marinas <catalin.marinas@arm.com>]

On Tue, 2009-08-11 at 09:32 +0200, Ingo Molnar wrote:
> * Catalin Marinas <catalin.marinas@arm.com> wrote:
> > I tried similar config and with the mainline kernel I get some 
> > lockups (several seconds) with CONFIG_PREEMPT disabled on ARM 
> > machines or x86 during a scanning episode but it eventually 
> > completes the scanning. With the kmemleak patches for the next 
> > merging window, I don't get any lockups as it has more 
> > cond_resched() calls.
> 
> How big are those patches? Kmemleak is new in .31 so if it fixes a 
> real problem it might still be acceptable.

My patches for -next were posted here -
http://lkml.org/lkml/2009/7/24/166 - but the relevant ones are pretty
small (review/ack is welcomed):

http://lkml.org/lkml/2009/7/24/176 - allow rescheduling during object
scanning
http://lkml.org/lkml/2009/7/24/173 - inform kmemleak about kernel stack
allocation (needs ack by the x86 people)
http://lkml.org/lkml/2009/7/24/172 - always scan the task stacks

-- 
Catalin