Re: [patch] CFS scheduler, v3

From: Siddha, Suresh B
Date: Tue Apr 24 2007 - 13:52:34 EST

On Tue, Apr 24, 2007 at 10:47:45AM -0700, Christoph Lameter wrote:
> On Tue, 24 Apr 2007, Siddha, Suresh B wrote:
> > Anyhow, this is a straight forward optimization and needs to be done. Do you
> > have any specific concerns?
> Yes there should not be contention on per cpu data in principle. The
> point of per cpu data is for the cpu to have access to contention free
> cachelines.
> If the data is contented then it should be moved out of per cpu data and properly
> placed to minimize contention. Otherwise we will get into cacheline
> aliases (__read_mostly in per cpu??) etc etc in the per cpu areas.

yes, we were planning to move this to a different percpu section, where
all the elements in this new section will be cacheline aligned(both
at the start, aswell as end)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at