Re: [RFC PATCH 00/09] robust VM per_cpu variables
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- To: Steven Rostedt <rostedt@xxxxxxxxxxx>
- Subject: Re: [RFC PATCH 00/09] robust VM per_cpu variables
- From: Christoph Lameter <clameter@xxxxxxx>
- Date: Wed, 17 May 2006 10:40:04 -0700 (PDT)
- Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, 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, linux390@xxxxxxxxxx, davem@xxxxxxxxxxxxx, arnd@xxxxxxxx, kenneth.w.chen@xxxxxxxxx, sam@xxxxxxxxxxxx, kiran@xxxxxxxxxxxx
- In-reply-to: <Pine.LNX.4.58.0605171152190.15798@xxxxxxxxxxxxxxxxxxx>
- References: <Pine.LNX.4.58.0605170547490.8408@xxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0605170744360.13021@xxxxxxxxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.58.0605171104100.13160@xxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.64.0605170846190.13337@xxxxxxxxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.58.0605171152190.15798@xxxxxxxxxxxxxxxxxxx>
On Wed, 17 May 2006, Steven Rostedt wrote:
> > Well I'd like to see a comprehensive solution including a fix for the
> > problems with allocper_cpu() allocations (allocper_cpu has to allocate
> > memory for potential processors... which could be a lot on
> > some types of systems and its allocated somewhere not on the nodes of the
> > processor since they may not yet be online).
>
> OK, now you're beyond what I'm working with ;) No hot plug CPUs for me.
> Well, at least not yet!
You need to at least consider how this could be handled by the per_cpu
memory manangement. The VM thingie with dynamic per cpu memory would allow
a fixup of allocpercpu.
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