Messages in this thread | | | Date | Tue, 10 Jan 2023 14:13:53 +0530 | From | Ravi Bangoria <> | Subject | Re: [RFC 0/4] perf tool: Fix non-".text" symbol resolution for kernel modules |
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Hi Adrian,
On 10-Jan-23 12:05 PM, Adrian Hunter wrote: > On 10/01/23 07:58, Ravi Bangoria wrote: >> Kernel module elf contains executable code in non-".text" sections as >> well, for ex: ".noinstr.text". Plus, kernel module's memory layout >> differs from it's binary layout because .ko elf does not contain >> program header table. > > Have you looked at using perf record --kcore option.
Nice! We can also use --kallsyms with perf report and it resolves symbols fine.
But what about normal perf record/report? Why I'm enforcing on normal perf- record/report is because, generally user don't specify these options, esp if he has root privileges, he expects symbol-resolution should just work fine. But when he sees inconsistency in symbol-resolution of the same kernel module, he will be clueless of what's missing. This patchset is trying to solve it, although I too feel adding section specific maps to perf.data is overkill as --kcore or --kallsyms can also resolve those symbols.
Thanks for your feedback, Ravi
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