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Date: Wed, 21 Apr 2010 05:47:07 -0600 From: "Gregory Haskins" <ghaskins@...ell.com> To: "Peter Zijlstra" <peterz@...radead.org>, "John Kacur" <jkacur@...hat.com> Cc: "Ingo Molnar" <mingo@...e.hu>, "Thomas Gleixner" <tglx@...utronix.de>, "Andrew Morton" <akpm@...ux-foundation.org>, "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>, "Clark Williams" <williams@...hat.com>, <linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org> Subject: Re: [PATCH v3] lockdep: Make MAX_STACK_TRACE_ENTRIES configurable. >>> On 4/21/2010 at 07:37 AM, in message <1271849823.1776.87.camel@...top>, Peter Zijlstra <peterz@...radead.org> wrote: > On Wed, 2010-04-21 at 13:12 +0200, John Kacur wrote: >> >> Certain configurations that have LOCKDEP turned on, run into the limit >> where the MAX_STACK_TRACE_ENTRIES are too small. Rather than simply >> turning of the locking correctness validator let the user configure this >> value to something reasonable for their system. > > I'm not sure its worth having a CONFIG_ value for this, that'll just be > yet another random value nobody knows what to do with. > > Do you actually have a machine that reproduces this? Can you see how > many classes, avg stacktraces per class and the avg entries per > stacktrace there are? > > Also, is there's lots of classes, are there many with a similar name? > > That is, is it a valid depletion or is there something wonkey with those > setups? Hi John, Peter. I am not sure if Johns solution is the right/best one per se, but I can attest that I used to hit this problem _all_ the time and it was somewhat annoying to need to patch the kernel on all of my machines to fix it. I realize that I perhaps do not represent the average user, but it was a pain-point for me. FWIW, John's patch would indeed make my life easier since I tend to share the .config between builds. Kind Regards, -Greg > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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