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Date: Tue, 26 Jan 2010 23:03:01 +0100 From: Andi Kleen <andi@...stfloor.org> To: Oleg Nesterov <oleg@...hat.com> Cc: Andi Kleen <andi@...stfloor.org>, Linus Torvalds <torvalds@...ux-foundation.org>, tromey@...hat.com, Stephen Rothwell <sfr@...b.auug.org.au>, Kyle Moffett <kyle@...fetthome.net>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Peter Zijlstra <peterz@...radead.org>, Fr??d??ric Weisbecker <fweisbec@...il.com>, Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...hat.com>, "Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com, Thomas Gleixner <tglx@...utronix.de> Subject: Re: linux-next: add utrace tree > Simple example. Try to debug/strace strace ot gdb itself. Not trivial, > you can't attach to strace's tracees. Recently I spent 2 days trying to > understand why strace -f hangs. I was able to attach to strace, but > I wasn't able to see what its tracees do. But what would the semantics be inside the tracees even if you could? > And, it was not possible to even trace strace until it hangs, with > ptrace the tracee (strace) must stop to report the event and this > shadowed the race. "Shadowing the race" was the second surname of strace I thought anyways @) Basically if you care about races never use strace in the first place. -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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