From: Paulo Marques <pmarques@grupopie.com>
To: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Cc: William Lee Irwin III <wli@holomorphy.com>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: top hogs CPU in 2.6: kallsyms_lookup is very slow
Date: Fri, 17 Sep 2004 12:27:16 +0100 [thread overview]
Message-ID: <414ACA14.1000608@grupopie.com> (raw)
In-Reply-To: <200409171201.15158.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
next prev parent reply other threads:[~2004-09-17 11:31 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-16 11:28 top hogs CPU in 2.6: kallsyms_lookup is very slow Denis Vlasenko
2004-09-16 11:45 ` William Lee Irwin III
2004-09-16 11:57 ` Denis Vlasenko
2004-09-16 12:17 ` William Lee Irwin III
2004-09-16 12:31 ` Denis Vlasenko
2004-09-17 8:57 ` Denis Vlasenko
2004-09-17 11:03 ` William Lee Irwin III
2004-09-17 12:34 ` Denis Vlasenko
2004-09-17 13:33 ` William Lee Irwin III
2004-09-17 20:36 ` Denis Vlasenko
2004-09-17 21:32 ` William Lee Irwin III
[not found] ` <200409172155.29561.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-18 13:57 ` [PATCH] trivial patch for 2.4: always inline __constant_* Denis Vlasenko
2004-09-18 14:03 ` [PATCH] trivial patch for 2.4: resolve megaraid_info name collision Denis Vlasenko
2004-09-18 14:02 ` Marcelo Tosatti
2004-09-18 15:05 ` [PATCH] trivial patch for 2.4: always inline __constant_* Marcelo Tosatti
2004-09-17 9:01 ` top hogs CPU in 2.6: kallsyms_lookup is very slow Denis Vlasenko
2004-09-17 10:55 ` William Lee Irwin III
2004-09-17 11:27 ` Paulo Marques [this message]
2004-09-17 11:21 ` Denis Vlasenko
2004-09-17 12:10 ` William Lee Irwin III
2004-09-17 13:04 ` Denis Vlasenko
2004-09-17 13:55 ` Larry McVoy
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