Re: [RFC] oom-kill: give the dying task a higher priority

[David Rientjes]

On Thu, 3 Jun 2010, Peter Zijlstra wrote:

> > And that can reduce the runtime of the thread holding a writelock on 
> > mm->mmap_sem, making the exit actually take longer than without the patch 
> > if its priority is significantly higher, especially on smaller machines. 
> 
> /me smells an inversion... on -rt we solved those ;-)
> 

Right, but I don't see how increasing an oom killed tasks priority to a 
divine priority doesn't impact the priorities of other tasks which may be 
blocking the exit of that task, namely a coredumper or holder of 
mm->mmap_sem.  This patch also doesn't address how it negatively impacts 
the priorities of jobs running in different cpusets (although sharing the 
same cpus) because one cpuset is oom.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/