Re: [PATCH 00/05] robust per_cpu allocation for modules
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- To: kiran@xxxxxxxxxxxx
- Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
- From: Christoph Lameter <clameter@xxxxxxx>
- Date: Mon, 17 Apr 2006 09:55:02 -0700 (PDT)
- Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>, Martin Mares <mj@xxxxxxxxxxxxxxxxxxxxxxxx>, bjornw@xxxxxxxx, schwidefsky@xxxxxxxxxx, benedict.gaster@xxxxxxxxxx, lethal@xxxxxxxxxxxx, Chris Zankel <chris@xxxxxxxxxx>, Marc Gauthier <marc@xxxxxxxxxxxxx>, Joe Taylor <joe@xxxxxxxxxxxxx>, David Mosberger-Tang <davidm@xxxxxxxxxx>, rth@xxxxxxxxxxx, spyro@xxxxxxx, starvik@xxxxxxxx, tony.luck@xxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, ralf@xxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, grundler@xxxxxxxxxxxxxxxx, parisc-linux@xxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxx, paulus@xxxxxxxxx, linux390@xxxxxxxxxx, davem@xxxxxxxxxxxxx
- In-reply-to: <4440855A.7040203@xxxxxxxxxxxx>
- References: <1145049535.1336.128.camel@xxxxxxxxxxxxxxxxxxxxx> <4440855A.7040203@xxxxxxxxxxxx>
On Sat, 15 Apr 2006, Nick Piggin wrote:
> If I'm following you correctly, this adds another dependent load
> to a per-CPU data access, and from memory that isn't node-affine.
I am also concerned about that. Kiran has a patch to avoid allocpercpu
having to go through one level of indirection that I guess would no
longer work with this scheme.
> If so, I think people with SMP and NUMA kernels would care more
> about performance and scalability than the few k of memory this
> saves.
Right.
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