Blaster4385/linux-IllusionX
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux-IllusionX/tools/perf
History
Namhyung Kim 02e17ca917 perf annotate-data: Handle this-cpu variables in kernel 
On x86, the kernel gets the current task using the current macro like
below:

  #define current  get_current()

  static __always_inline struct task_struct *get_current(void)
  {
      return this_cpu_read_stable(pcpu_hot.current_task);
  }

So it returns the current_task field of struct pcpu_hot which is the
first member.  On my build, it's located at 0x32940.

  $ nm vmlinux | grep pcpu_hot
  0000000000032940 D pcpu_hot

And the current macro generates the instructions like below:

  mov  %gs:0x32940, %rcx

So the %gs segment register points to the beginning of the per-cpu
region of this cpu and it points the variable with a constant.

Let's update the instruction location info to have a segment register
and handle %gs in kernel to look up a global variable.  Pretend it as
a global variable by changing the register number to DWARF_REG_PC.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240319055115.4063940-18-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2024-03-21 10:41:29 -03:00
..
arch perf cpumap: Use perf_cpu_map__for_each_cpu when possible 2024-03-21 10:41:28 -03:00
bench libperf cpumap: Replace usage of perf_cpu_map__new(NULL) with perf_cpu_map__new_online_cpus() 2023-12-12 14:55:13 -03:00
dlfilters perf dlfilter: Add a test for object_code() 2023-09-30 00:09:06 -07:00
Documentation perf docs arm_spe: Clarify more SPE requirements related to KPTI 2024-03-21 10:41:27 -03:00
include/perf perf dlfilter: Add al_cleanup() 2023-08-15 16:41:49 -03:00
jvmti
pmu-events perf vendor events amd: Fix Zen 4 cache latency events 2024-03-03 22:49:37 -08:00
python perf python: Convert tracepoint.py example to python3 2022-04-01 16:19:35 -03:00
scripts perf scripts python arm-cs-trace-disasm.py: Do not ignore disam first sample 2023-12-20 14:31:59 -03:00
tests perf cpumap: Use perf_cpu_map__for_each_cpu when possible 2024-03-21 10:41:28 -03:00
trace tools headers: Remove almost unused copy of uapi/stat.h, add few conditional defines 2024-03-21 10:41:27 -03:00
ui perf annotate: Calculate instruction overhead using hashmap 2024-03-06 20:25:20 -08:00
util perf annotate-data: Handle this-cpu variables in kernel 2024-03-21 10:41:29 -03:00
.gitignore perf build: Shellcheck support for OUTPUT directory 2023-12-05 15:46:43 -03:00
Build perf script: Fix Python support when no libtraceevent 2023-03-15 10:27:07 -03:00
builtin-annotate.c perf annotate-data: Implement instruction tracking 2024-03-21 10:41:29 -03:00
builtin-bench.c perf tools changes for v6.6: 2023-09-09 20:06:17 -07:00
builtin-buildid-cache.c perf buildid-cache: Fix use of uninitialized value 2023-10-12 10:01:56 -07:00
builtin-buildid-list.c perf util: Move input_name to util 2023-04-10 19:21:31 -03:00
builtin-c2c.c perf cpumap: Clean up use of perf_cpu_map__has_any_cpu_or_is_empty 2024-03-21 10:41:28 -03:00
builtin-config.c perf path: Make mkpath thread safe, remove 16384 bytes from .bss 2023-05-28 10:24:14 -03:00
builtin-daemon.c perf tools: Add missing else to cmd_daemon subcommand condition 2023-06-27 12:09:44 -07:00
builtin-data.c perf util: Move input_name to util 2023-04-10 19:21:31 -03:00
builtin-diff.c perf diff: Replaces some ',' as separator with the more usual ';' 2023-07-20 11:43:45 -03:00
builtin-evlist.c perf util: Move input_name to util 2023-04-10 19:21:31 -03:00
builtin-ftrace.c libperf cpumap: Replace usage of perf_cpu_map__new(NULL) with perf_cpu_map__new_online_cpus() 2023-12-12 14:55:13 -03:00
builtin-help.c perf path: Make mkpath thread safe, remove 16384 bytes from .bss 2023-05-28 10:24:14 -03:00
builtin-inject.c perf record: Lazy load kernel symbols 2023-11-09 13:49:32 -03:00
builtin-kallsyms.c perf symbol: Remove now unused symbol_conf.sort_by_name 2023-06-23 21:48:49 -07:00
builtin-kmem.c perf callchain: Use pthread keys for tls callchain_cursor 2023-06-12 15:57:54 -03:00
builtin-kvm.c perf evsel: Introduce evsel__name_is() method to check if the evsel name is equal to a given string 2023-04-24 14:28:11 -03:00
builtin-kwork.c perf kwork: Fix a build error on 32-bit 2023-11-21 10:02:38 -08:00
builtin-list.c perf list: For metricgroup only list include description 2024-02-16 16:07:34 -08:00
builtin-lock.c perf lock: Fix a memory leak on an error path 2023-11-27 10:21:27 -03:00
builtin-mem.c perf mem: Clean up perf_pmus__num_mem_pmus() 2024-01-24 14:05:22 -08:00
builtin-probe.c perf probe: Dynamically allocate params memory 2023-05-28 10:24:02 -03:00
builtin-record.c Merge branch 'perf-tools' into perf-tools-next 2024-02-12 12:19:21 -08:00
builtin-report.c perf report: Sort child tasks by tid 2024-03-03 22:50:55 -08:00
builtin-sched.c perf sched: Move curr_pid and cpu_last_switched initialization to perf_sched__{lat|map|replay}() 2024-02-09 14:08:41 -08:00
builtin-script.c perf script: Show also errors for --insn-trace option 2024-03-21 10:41:27 -03:00
builtin-stat.c perf stat: Remove duplicate cpus_map_matched function 2024-03-21 10:41:28 -03:00
builtin-timechart.c perf addr_location: Add init/exit/copy functions 2023-06-12 15:57:53 -03:00
builtin-top.c Merge branch 'perf-tools' into perf-tools-next 2024-02-12 12:19:21 -08:00
builtin-trace.c perf trace: Collect sys_nanosleep first argument 2024-03-21 10:41:26 -03:00
builtin-version.c perf version: Display availability of OpenCSD support 2024-03-03 22:48:40 -08:00
builtin.h perf usage: Move usage strings 2023-04-10 19:20:53 -03:00
check-headers.sh tools headers: Remove almost unused copy of uapi/stat.h, add few conditional defines 2024-03-21 10:41:27 -03:00
command-list.txt perf help: Use HAVE_LIBTRACEEVENT to filter out unsupported commands 2023-01-02 11:51:53 -03:00
CREDITS
design.txt perf design.txt: Synchronize the definition of enum perf_hw_id with code 2021-11-13 18:11:50 -03:00
Makefile perf tools: Use "grep -E" instead of "egrep" 2022-12-14 15:28:19 -03:00
Makefile.config treewide: remove meaningless assignments in Makefiles 2024-02-23 14:19:07 -08:00
Makefile.perf perf build: Fix out of tree build related to installation of sysreg-defs 2024-03-21 10:41:27 -03:00
MANIFEST tools perf: Add arm64 sysreg files to MANIFEST 2023-11-22 11:17:53 -08:00
perf-archive.sh perf archive: Add new option '--unpack' to expand tarballs 2023-12-20 13:20:45 -03:00
perf-completion.sh perf shell completion: Support completion of metrics/metricgroups 2023-09-11 10:26:36 -03:00
perf-iostat.sh
perf-read-vdso.c
perf-sys.h
perf.c perf tools: Add --debug-file option to redirect debug output 2023-11-28 14:14:53 -03:00
perf.h perf util: Move perf_guest/host declarations 2023-04-10 19:22:05 -03:00