Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH 1/2] perf script: Make it possible to see perf's kernel and module memory mappings | Date | Fri, 2 Feb 2024 13:01:29 +0200 |
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Dump kmaps if verbose > 2.
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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