Re: [PATCH 00/05] robust per_cpu allocation for modules
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- To: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
- Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
- From: Andi Kleen <ak@xxxxxxx>
- Date: Mon, 17 Apr 2006 19:10:46 +0200
- Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, 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: <4441ECE6.5010709@xxxxxxxxxxxx>
- References: <1145049535.1336.128.camel@xxxxxxxxxxxxxxxxxxxxx> <Pine.LNX.4.58.0604152323560.16853@xxxxxxxxxxxxxxxxxxx> <4441ECE6.5010709@xxxxxxxxxxxx>
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On Sunday 16 April 2006 09:06, Nick Piggin wrote:
> I still don't understand what the justification is for slowing down
> this critical bit of infrastructure for something that is only a
> problem in the -rt patchset, and even then only a problem when tracing
> is enabled.
There are actually problems outside -rt. e.g. the Xen kernel was running
into a near overflow and as more and more code is using per cpu variables
others might too.
I'm confident the problem can be solved without adding more variables
though - e.g. in the way rusty proposed.
-Andi
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