Messages in this thread | | | Date | Thu, 26 May 2011 18:28:05 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [tip:perf/urgent] perf symbols: Handle /proc/sys/kernel/kptr_restrict |
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Em Thu, May 26, 2011 at 09:39:46PM +0200, Ingo Molnar escreveu: > Secondly, even though i have the proper 'vmlinux' in cwd, i get half > a page long warnings on perf record warning me about the vmlinux: > > WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted, check /proc/sys/kernel/kptr_restrict. > > Samples in kernel functions may not be resolved if a suitable > vmlinux file is not found in the buildid cache or in the vmlinux > path. > > ... > > But a vmlinux file *is* in the cwd.
Well, there was no assumption that 'perf report' would run on the same directory as 'perf record', the user may have moved to a different directory or transferred the perf.data file to a different machine.
Also it would have to check that the vmlinux on the path is suitable (that build-id matches), currently it does that just at 'perf report' time, that is when it will need to use it. At record time we just collect the build-ids.
With that in mind, how do you think it should be phrased?
- Arnaldo
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