linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Message-ID: <20130504155558.GA12870@logfs.org>
Date:	Sat, 4 May 2013 11:55:58 -0400
From:	Jörn Engel <joern@...fs.org>
To:	Emmanuel Benisty <benisty.e@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...riel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	"Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: ipc,sem: sysv semaphore scalability

On Sat, 23 March 2013 10:19:16 +0700, Emmanuel Benisty wrote:
> 
> I could reproduce it but could you please let me know what would be
> the right tools I should use to catch the original oops?
> This is what I got but I doubt it will be helpful:
> http://i.imgur.com/Mewi1hC.jpg

You could use either netconsole or blockconsole.  Netconsole requires
a second machine to capture the information, blockconsole requires a
usb key or something similar to write to.  In both cases you will get
the entire console output in a file, often including very helpful
messages leading up to the crash.

Blockconsole currently lives here:
https://git.kernel.org/cgit/linux/kernel/git/joern/bcon2.git/

Jörn

--
Unless something dramatically changes, by 2015 we'll be largely
wondering what all the fuss surrounding Linux was really about.
-- Rob Enderle
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