On (10/07/07 13:04), Peter Zijlstra didst pronounce:
> On Tue, 2007-07-10 at 11:20 +0100, Mel Gorman wrote:
>
> <snip>
>
> > > lumpy-reclaim-v4.patch
> >
> > This patch is really what lumpy reclaim is. I believe Peter has looked
> > at this and was happy enough at the time although he is cc'd here again
> > in case this has changed. This is mainly useful with either grouping
> > pages by mobility or the ZONE_MOVABLE stuff. However, at the time the
> > patch was proposed, there was a feeling that it might help jumbo frame
> > allocation on e1000's and maybe if fsblock optimistically uses
> > contiguous pages it would have an application. I would like to see it go
> > through to see does it help e1000 at least.
>
> I'm not seeing how this will help e1000 (and other jumbo drivers). They
> typically allocate using GFP_ATOMIC, so in order to satisfy those you'd
> need to either have a higher order watermark or do atomic defrag of the
> free space.
>
It does help somewhat indirectly and in an unsatisfactory manner. When the
higher watermarks are breached, the atomic allocation will still succeeed
but kswapd will be poked to reclaim at a given order. This is similar to
the problems SLUB hits when it uses high-orders frequently.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
