Re: top hogs CPU in 2.6: kallsyms_lookup is very slow
From: Paulo Marques (pmarques_at_grupopie.com)
Date: 09/17/04
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Date: Fri, 17 Sep 2004 12:27:16 +0100 To: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Denis Vlasenko wrote:
> On Thursday 16 September 2004 15:17, William Lee Irwin III wrote:
>>Did the kallsyms patches reduce the cpu overhead from get_wchan()?
>
>
> Yes. top does not hog CPU anymore. It takes even a liitle bit *less*
> CPU than in 2.4 now.
Great!
I was the one who wrote those patches, so I'm glad to know that they
actually made a difference in real world workloads (like using "top").
Reading /proc/kallsyms should be a lot faster too, although there is no
comparison with 2.4 kernel, because there where no kallsyms there. It
can be compared with previous 2.6 kernels, though.
-- Paulo Marques - www.grupopie.com To err is human, but to really foul things up requires a computer. Farmers' Almanac, 1978 - 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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