Messages in this thread |  | | Date | Mon, 16 Jan 2023 09:51:27 +0530 | Subject | Re: [RFC 0/4] perf tool: Fix non-".text" symbol resolution for kernel modules | From | Ravi Bangoria <> |
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Hi all,
On 10-Jan-23 11:28 AM, 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. > > Perf tries to solve it by creating special maps for allocated (SHF_ALLOC) > elf sections, but perf uses elf addresses for map address range and thus > these special maps remains unused because no real ip falls into their > address range. > > Solve this by preparing section specific special maps using addresses > provided by sysfs /sys/module/.../sections/. Also save these details in > PERF_RECORD_KMOD_SEC_MAP format in perf.data which can be consumed at > perf-report time.
Do you guys feel this is worth to fix and I shall continue? Or --kcore / --kallsyms workarounds are sufficient?
Thanks, Ravi
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