Messages in this thread | ![/](/images/icornerl.gif) | | From | Namhyung Kim <> | Date | Fri, 2 Feb 2024 17:50:20 -0800 | Subject | Re: [PATCH 1/2] perf script: Make it possible to see perf's kernel and module memory mappings |
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On Fri, Feb 2, 2024 at 3:01 AM Adrian Hunter <adrian.hunter@intel.com> wrote: > > Dump kmaps if verbose > 2.
Maybe we can add '--debug kmap' option rather than using an arbitrary verbose level.
Thanks, Namhyung
> > Example: > > $ perf script -vvv 2>&1 >/dev/null | grep kvm.intel > build id event received for /lib/modules/6.7.2-local/kernel/arch/x86/kvm/kvm-intel.ko: 0691d75e10e72ebbbd45a44c59f6d00a5604badf [20] > Map: 0-3a3 4f5d8 [kvm_intel].modinfo > Map: 0-5240 5f280 [kvm_intel]__versions > Map: 0-30 64 [kvm_intel].note.Linux > Map: 0-14 644c0 [kvm_intel].orc_header > Map: 0-5297 43680 [kvm_intel].rodata > Map: 0-5bee 3b837 [kvm_intel].text.unlikely > Map: 0-7e0 41430 [kvm_intel].noinstr.text > Map: 0-2080 713c0 [kvm_intel].bss > Map: 0-26 705c8 [kvm_intel].data..read_mostly > Map: 0-5888 6a4c0 [kvm_intel].data > Map: 0-22 70220 [kvm_intel].data.once > Map: 0-40 705f0 [kvm_intel].data..percpu > Map: 0-1685 41d20 [kvm_intel].init.text > Map: 0-4b8 6fd60 [kvm_intel].init.data > Map: 0-380 70248 [kvm_intel]__dyndbg > Map: 0-8 70218 [kvm_intel].exit.data > Map: 0-438 4f980 [kvm_intel]__param > Map: 0-5f5 4ca0f [kvm_intel].rodata.str1.1 > Map: 0-3657 493b8 [kvm_intel].rodata.str1.8 > Map: 0-e0 70640 [kvm_intel].data..ro_after_init > Map: 0-500 70ec0 [kvm_intel].gnu.linkonce.this_module > Map: ffffffffc13a7000-ffffffffc1421000 a0 /lib/modules/6.7.2-local/kernel/arch/x86/kvm/kvm-intel.ko > > The example above shows how the module section mappings are all wrong > except for the main .text mapping at 0xffffffffc13a7000. > > Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> > --- > tools/perf/builtin-script.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c > index b1f57401ff23..e764b319ef59 100644 > --- a/tools/perf/builtin-script.c > +++ b/tools/perf/builtin-script.c > @@ -3806,6 +3806,16 @@ static int parse_callret_trace(const struct option *opt __maybe_unused, > return 0; > } > > +static void dump_kmaps(struct perf_session *session) > +{ > + int save_verbose = verbose; > + > + pr_debug("Kernel and module maps:\n"); > + verbose = 0; /* Suppress verbose to print a summary only */ > + maps__fprintf(machine__kernel_maps(&session->machines.host), stderr); > + verbose = save_verbose; > +} > + > int cmd_script(int argc, const char **argv) > { > bool show_full_info = false; > @@ -4366,6 +4376,9 @@ int cmd_script(int argc, const char **argv) > > flush_scripting(); > > + if (verbose > 2) > + dump_kmaps(session); > + > out_delete: > if (script.ptime_range) { > itrace_synth_opts__clear_time_range(&itrace_synth_opts); > -- > 2.34.1 >
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