Re: [BENCHMARK] nproc: netlink access to /proc information
From: Paulo Marques
Date: Mon Aug 30 2004 - 07:24:52 EST
William Lee Irwin III wrote:
Albert Cahalan wrote:
This is crummy. It's done for wchan, since that is so horribly
expensive, but I'm not liking the larger race condition window.
Remember that PIDs get reused. There isn't a generation counter
or UUID that can be checked.
On Mon, Aug 30, 2004 at 11:31:43AM +0100, Paulo Marques wrote:
I just wanted to call your attention to the kallsyms speedup patch that
is now on the -mm tree.
It should improve wchan speed. My benchmarks for kallsyms_lookup (the
function that was responsible for the wchan time) went from 1340us to 0.5us.
So maybe this is enough not to make wchan a special case anymore...
This seems to go wrong on big-endian machines; any chance you could look
over your stuff and try to figure out what endianness issues it may have?
I went over the code but at a first glance couldn't find a notorius
trouble spot. I don't have big-endian hardware myself so this is hard to
test.
Just a few questions to help me out in finding the problem:
- is this really an endianess problem or is it a 64-bit integer problem?
- are you cross compiling the kernel?
Thanks in advance,
--
Paulo Marques - www.grupopie.com
To err is human, but to really foul things up requires a computer.
Farmers' Almanac, 1978
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