Re: [RFC GIT PULL] softirq: Consolidation and stack overrun fix

[Benjamin Herrenschmidt]

On Tue, 2013-09-24 at 10:21 +0200, Peter Zijlstra wrote:
> > I don't see how that relates to the above though...
> 
> It was a comment on the increase of per-cpu usage in generic code.

Oh I see. Ok, but some things are intrinsically per-task so if you use
per-cpu in that case you end up context switching, at least that's what
Linus alluded to. It would be nice if such construct we design so that
we still access them via the task struct on arch where such accesses are
cheap.

I think if/when we get rid of using r13 for our arch specific "PACA", it
becomes easy for me to experiment with using it for either per-cpu or
current and do some measurements. It also means I can easily switch "the
other way" if I need to. I'll dig into that, it will probably take some
time before I sanitize our code enough anyway.

Cheers,
Ben.
 

--
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/