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Message-ID: <20140314201943.GB6633@redhat.com> Date: Fri, 14 Mar 2014 16:19:43 -0400 From: Dave Jones <davej@...hat.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Kees Cook <keescook@...omium.org>, Sasha Levin <sasha.levin@...cle.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, a.p.zijlstra@...llo.nl Subject: perf top breakage. On Fri, Mar 14, 2014 at 12:41:41PM -0700, Linus Torvalds wrote: > On Fri, Mar 14, 2014 at 12:32 PM, Linus Torvalds > <torvalds@...ux-foundation.org> wrote: > > > > Hmm. Do you have CONFIG_KALLSYMS enabled? > > Just to clarify. KALLSYMS is required to figure out the symbol > addresses on a kaslr system. There's no way to look them up in a > System.map file or the object file, since the addresses aren't going > to match. > > Your symptoms really sound like you might not have KALLSYMS enabled. > > I wonder if we have a "select KALLSYMS" as part of RANDOMIZE_BASE, > since you need it for debug messages too (random hex numbers aren't > too useful ;) Ok, I've figured out the cause. kaslr is a red herring. This works : # su - root $ tools/perf/perf top This doesn't: # sudo tools/perf/perf top Neither does: # su - root $ sudo tools/perf/perf top So somehow sudo+perf broke. fun. The 3.13 binary works regardless of how I call it. Dave -- 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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