Re: [PATCH 2/3] page allocator: Do not allow interrupts to useALLOC_HARDER

[David Rientjes]

On Sat, 31 Oct 2009, Pavel Machek wrote:

> > Giving rt tasks access to memory reserves is necessary to reduce latency, 
> > the privilege does not apply to interrupts that subsequently get run on 
> > the same cpu.
> 
> If rt task needs to allocate memory like that, then its broken,
> anyway...
> 

Um, no, it's a matter of the kernel implementation.  We allow such tasks 
to allocate deeper into reserves to avoid the page allocator from 
incurring a significant penalty when direct reclaim is required.  
Background reclaim has already commenced at this point in the slowpath.
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