Messages in this thread | | | Date | Fri, 7 Dec 2001 18:22:14 +0530 | From | Dipankar Sarma <> | Subject | Re: [RFC] [PATCH] Scalable Statistics Counters |
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On Thu, Dec 06, 2001 at 02:18:26PM +1100, Rusty Russell wrote: > On Wed, 05 Dec 2001 12:08:57 -0800 > Andrew Morton <akpm@zip.com.au> wrote: > > > http://www.zipworld.com.au/~akpm/linux/2.4/2.4.7/ > > Oops, guess I should have read this thread first (still catching up on mail). > > Please see my per-cpu patch (just posted under [PATCH] 2.5.1-pre5: per-cpu > areas), and my previous /proc patch. Combining the two into convenient form > is left as an exercise for the reader...
Hi Rusty,
Your per-cpu area patch looks like a good solution with a very simple implementation. BTW, some OSes map the per-cpu data areas to the same virtual address for each CPU avoiding the per-cpu data array lookup. I am not sure if this really saves much, we are ourselves trying to understand the overhead of such array lookup with statctrs.
IIUC, we can declare statically allocated per-cpu data using this allocator (kstat, apic_timer_irqs etc.). For things that are a part of dynamically allocated structure, we would still need to use a dynamic per-cpu allocator, right ?
Another interesting question is how we can load different per-cpu sections to different areas in memory. I would suspect that for NUMA, we would want to locate the per-cpu sections closest to the corresponding CPUs.
I couldn't find the /proc patch. Any pointers ?
Thanks Dipankar -- Dipankar Sarma <dipankar@in.ibm.com> http://lse.sourceforge.net Linux Technology Center, IBM Software Lab, Bangalore, India. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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