From: Nick Piggin <nickpiggin@yahoo•com.au>
To: Steven Rostedt <rostedt@goodmis•org>
Cc: Andrew Morton <akpm@osdl•org>,
linux-mips@linux-mips•org,
David Mosberger-Tang <davidm@hpl•hp.com>,
linux-ia64@vger•kernel.org,
Martin Mares <mj@atrey•karlin.mff.cuni.cz>,
spyro@f2s•com, Joe Taylor <joe@tensilica•com>,
Andi Kleen <ak@suse•de>,
linuxppc-dev@ozlabs•org, paulus@samba•org,
benedict.gaster@superh•com, bjornw@axis•com,
Ingo Molnar <mingo@elte•hu>,
grundler@parisc-linux•org, starvik@axis•com,
Linus Torvalds <torvalds@osdl•org>,
Thomas Gleixner <tglx@linutronix•de>,
rth@twiddle•net, Chris Zankel <chris@zankel•net>,
tony.luck@intel•com, LKML <linux-kernel@vger•kernel.org>,
ralf@linux-mips•org, Marc Gauthier <marc@tensilica•com>,
lethal@linux-sh•org, schwidefsky@de•ibm.com, linux390@de•ibm.com,
davem@davemloft•net, parisc-linux@parisc-linux•org
Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
Date: Sat, 15 Apr 2006 15:32:10 +1000 [thread overview]
Message-ID: <4440855A.7040203@yahoo.com.au> (raw)
In-Reply-To: <1145049535.1336.128.camel@localhost.localdomain>
Steven Rostedt wrote:
> would now create a variable called per_cpu_offset__myint in
> the .data.percpu_offset section. This variable will point to the (if
> defined in the kernel) __per_cpu_offset[] array. If this was a module
> variable, it would point to the module per_cpu_offset[] array which is
> created when the modules is loaded.
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.
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.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-04-15 18:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-14 21:18 [PATCH 00/05] robust per_cpu allocation for modules Steven Rostedt
2006-04-14 22:06 ` Andrew Morton
2006-04-14 22:12 ` Steven Rostedt
2006-04-14 22:12 ` Chen, Kenneth W
2006-04-15 3:10 ` [PATCH 00/08] robust per_cpu allocation for modules - V2 Steven Rostedt
2006-04-15 5:32 ` Nick Piggin [this message]
2006-04-15 20:17 ` [PATCH 00/05] robust per_cpu allocation for modules Steven Rostedt
2006-04-16 2:47 ` Nick Piggin
2006-04-16 3:53 ` Steven Rostedt
2006-04-16 7:02 ` Paul Mackerras
2006-04-16 13:40 ` Steven Rostedt
2006-04-16 14:03 ` Sam Ravnborg
2006-04-16 15:34 ` Arnd Bergmann
2006-04-16 18:03 ` Tony Luck
2006-04-17 0:45 ` Steven Rostedt
2006-04-17 2:07 ` Arnd Bergmann
2006-04-17 2:17 ` Steven Rostedt
2006-04-17 20:06 ` Ravikiran G Thirumalai
2006-04-17 6:47 ` Rusty Russell
2006-04-17 11:33 ` Steven Rostedt
2006-04-16 7:06 ` Nick Piggin
2006-04-16 16:06 ` Steven Rostedt
2006-04-17 17:10 ` Andi Kleen
2006-04-17 16:55 ` Christoph Lameter
2006-04-17 22:02 ` Ravikiran G Thirumalai
2006-04-17 23:44 ` Steven Rostedt
2006-04-17 23:48 ` Christoph Lameter
2006-04-18 1:51 ` Steven Rostedt
2006-04-18 6:42 ` Nick Piggin
2006-04-18 12:47 ` Steven Rostedt
2006-04-16 6:35 ` Paul Mackerras
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