On Fri, Oct 21, 2022 at 8:19 AM youling 257 wrote: > CONFIG_DEBUG_INFO=y > CONFIG_AS_HAS_NON_CONST_LEB128=y > # CONFIG_DEBUG_INFO_NONE is not set > CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y > # CONFIG_DEBUG_INFO_DWARF4 is not set > # CONFIG_DEBUG_INFO_DWARF5 is not set > # CONFIG_DEBUG_INFO_REDUCED is not set > # CONFIG_DEBUG_INFO_COMPRESSED is not set > # CONFIG_DEBUG_INFO_SPLIT is not set > # CONFIG_DEBUG_INFO_BTF is not set > # CONFIG_GDB_SCRIPTS is not set > > perf top still no function name. > Will it help if you disable CONFIG_RANDOMIZE_BASE? (if it doesn't show the symbols, at least we'll be able to figure out the offending function by running nm) > > 12.90% [kernel] [k] 0xffffffff833dfa64 > 3.78% [kernel] [k] 0xffffffff8285b439 > 3.61% [kernel] [k] 0xffffffff83370254 > 2.32% [kernel] [k] 0xffffffff8337025b > 1.88% bluetooth.default.so [.] 0x000000000000d09d > > 2022-10-21 15:37 GMT+08:00, Marco Elver : > > On Thu, 20 Oct 2022 at 23:39, youling 257 wrote: > >> > >> PerfTop: 8253 irqs/sec kernel:75.3% exact: 100.0% lost: 0/0 drop: > >> 0/17899 [4000Hz cycles], (all, 8 CPUs) > >> > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > >> > >> 14.87% [kernel] [k] 0xffffffff941d1f37 > >> 6.71% [kernel] [k] 0xffffffff942016cf > >> > >> what is 0xffffffff941d1f37? > > > > You need to build with debug symbols: > > CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y > > > > Then it'll show function names. > > > >> 2022-10-21 14:16 GMT+08:00, Marco Elver : > >> > On Thu, 20 Oct 2022 at 22:55, youling 257 > wrote: > >> >> > >> >> How to use perf tool? > >> > > >> > The simplest would be to try just "perf top" - and see which kernel > >> > functions consume most CPU cycles. I would suggest you compare both > >> > kernels, and see if you can spot a function which uses more cycles% in > >> > the problematic kernel. > >> > > > > -- Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Straße, 33 80636 München Geschäftsführer: Paul Manicle, Liana Sebastian Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg