diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2024-02-08 11:53:25 +0300 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-02-09 02:49:39 +0300 |
| commit | 0bdfbd04c67e0578f304aef10a0b3b5cff392022 (patch) | |
| tree | cb1658a337f178239a563367ab96b46bad528139 /tools/perf/Documentation | |
| parent | 5b9e4eefc5f8d0638aa2e7ea1e92ea88e9948cf9 (diff) | |
| download | linux-0bdfbd04c67e0578f304aef10a0b3b5cff392022.tar.xz | |
perf tools: Make it possible to see perf's kernel and module memory mappings
Dump kmaps if using 'perf --debug kmaps' or verbose > 2 (e.g. -vvv) for
tools 'perf script' and 'perf report' if there is no browser.
Example:
$ perf --debug kmaps script 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>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Like Xu <like.xu.linux@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240208085326.13432-2-adrian.hunter@intel.com
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf.txt b/tools/perf/Documentation/perf.txt index a7cf7bc2f968..09f516f3fdfb 100644 --- a/tools/perf/Documentation/perf.txt +++ b/tools/perf/Documentation/perf.txt @@ -63,6 +63,8 @@ OPTIONS in browser mode perf-event-open - Print perf_event_open() arguments and return value + kmaps - Print kernel and module maps (perf script + and perf report without browser) --debug-file:: Write debug output to a specified file. |