Messages in this thread | | | Date | Wed, 26 Jun 2013 19:09:32 +0530 | Subject | Re: 3.10-rc6 "perf test" seems unhappy | From | Prabhat Kumar Ravi <> |
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Hi,
On Wed, Jun 26, 2013 at 4:39 PM, Andy Green <andy.green@linaro.org> wrote: > Hi - > > Running perf test on 3.10-rc6 gives some unexpected behaviours. > > This is on a dual Cortex A9 board with perf userland cross-built from > same tree as the kernel. > > root@aa9-eb:~# perf test > 1: vmlinux symtab matches kallsyms : FAILED!
> I started tracing the first failure... it stops because it can't find > "_stext" in /proc/kallsyms. But it is there > > root@aa9-eb:~# cat /proc/kallsyms | grep _stext > 800081c0 T _stext >
> > The others may be due to missing some config somewhere. > > Any ideas what I am (or perf is) doing wrong? >
I Think your Perf test is failing at dso__find_symbol_by_name where in perf test we have something like:
kallsyms_map = machine__kernel_map(&kallsyms, type);
sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL); if (sym == NULL) { pr_debug("dso__find_symbol_by_name "); goto out; }
Here sym is search for "_stext" which is NULL here so perf test fails here only,
Here _stext having same address as some other, like
c00081c0 T asm_do_IRQ c00081c0 T _stext c00081c0 T __exception_text_start
Function call is like this: machine__load_kallsyms --> dso__load_kallsyms --> symbols__fixup_duplicate
So, it getting deleted, I think we should disable symbols__fixup_duplicate.
- Prabhat
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