Merge tag 'perf-tools-for-v6.16-1-2025-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

Pull perf tools updates from Arnaldo Carvalho de Melo:
"perf report/top/annotate TUI:

Merge tag 'perf-tools-for-v6.16-1-2025-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

Pull perf tools updates from Arnaldo Carvalho de Melo:
"perf report/top/annotate TUI:

- Accept the left arrow key as a Zoom out if done on the first column

- Show if source code toggle status in title, to help spotting bugs
with the various disassemblers (capstone, llvm, objdump)

- Provide feedback on unhandled hotkeys

Build:

- Better inform when certain features are not available with warnings
in the build process and in 'perf version --build-options' or 'perf -vv'

perf record:

- Improve the --off-cpu code by synthesizing events for switch-out ->
switch-in intervals using a BPF program. This can be fine tuned
using a --off-cpu-thresh knob

perf report:

- Add 'tgid' sort key

perf mem/c2c:

- Add 'op', 'cache', 'snoop', 'dtlb' output fields

- Add support for 'ldlat' on AMD IBS (Instruction Based Sampling)

perf ftrace:

- Use process/session specific trace settings instead of messing with
the global ftrace knobs

perf trace:

- Implement syscall summary in BPF

- Support --summary-mode=cgroup

- Always print return value for syscalls returning a pid

- The rseq and set_robust_list don't return a pid, just -errno

perf lock contention:

- Symbolize zone->lock using BTF

- Add -J/--inject-delay option to estimate impact on application
performance by optimization of kernel locking behavior

perf stat:

- Improve hybrid support for the NMI watchdog warning

Symbol resolution:

- Handle 'u' and 'l' symbols in /proc/kallsyms, resolving some Rust
symbols

- Improve Rust demangler

Hardware tracing:

Intel PT:

- Fix PEBS-via-PT data_src

- Do not default to recording all switch events

- Fix pattern matching with python3 on the SQL viewer script

arm64:

- Fixups for the hip08 hha PMU

Vendor events:

- Update Intel events/metrics files for alderlake, alderlaken,
arrowlake, bonnell, broadwell, broadwellde, broadwellx,
cascadelakex, clearwaterforest, elkhartlake, emeraldrapids,
grandridge, graniterapids, haswell, haswellx, icelake, icelakex,
ivybridge, ivytown, jaketown, lunarlake, meteorlake, nehalemep,
nehalemex, rocketlake, sandybridge, sapphirerapids, sierraforest,
skylake, skylakex, snowridgex, tigerlake, westmereep-dp,
westmereep-sp, westmereep-sx

python support:

- Add support for event counts in the python binding, add a
counting.py example

perf list:

- Display the PMU name associated with a perf metric in JSON

perf test:

- Hybrid improvements for metric value validation test

- Fix LBR test by ignoring idle task

- Add AMD IBS sw filter ana d'ldlat' tests

- Add 'perf trace --summary-mode=cgroup' test

- Add tests for the various language symbol demanglers

Miscellaneous:

- Allow specifying the cpu an event will be tied using '-e
event/cpu=N/'

- Sync various headers with the kernel sources

- Add annotations to use clang's -Wthread-safety and fix some
problems it detected

- Make dump_stack() use perf's symbol resolution to provide better
backtraces

- Intel TPEBS support cleanups and fixes. TPEBS stands for Timed PEBS
(Precision Event-Based Sampling), that adds timing info, the
retirement latency of instructions

- Various memory allocation (some detected by ASAN) and reference
counting fixes

- Add a 8-byte aligned PERF_RECORD_COMPRESSED2 to replace
PERF_RECORD_COMPRESSED

- Skip unsupported event types in perf.data files, don't stop when
finding one

- Improve lookups using hashmaps and binary searches"

* tag 'perf-tools-for-v6.16-1-2025-06-03' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (206 commits)
perf callchain: Always populate the addr_location map when adding IP
perf lock contention: Reject more than 10ms delays for safety
perf trace: Set errpid to false for rseq and set_robust_list
perf symbol: Move demangling code out of symbol-elf.c
perf trace: Always print return value for syscalls returning a pid
perf script: Print PERF_AUX_FLAG_COLLISION flag
perf mem: Show absolute percent in mem_stat output
perf mem: Display sort order only if it's available
perf mem: Describe overhead calculation in brief
perf record: Fix incorrect --user-regs comments
Revert "perf thread: Ensure comm_lock held for comm_list"
perf test trace_summary: Skip --bpf-summary tests if no libbpf
perf test intel-pt: Skip jitdump test if no libelf
perf intel-tpebs: Avoid race when evlist is being deleted
perf test demangle-java: Don't segv if demangling fails
perf symbol: Fix use-after-free in filename__read_build_id
perf pmu: Avoid segv for missing name/alias_name in wildcarding
perf machine: Factor creating a "live" machine out of dwarf-unwind
perf test: Add AMD IBS sw filter test
perf mem: Count L2 HITM for c2c statistic
...

show more ...

perf trace: Support --summary-mode=cgroup

Add a new summary mode to collect stats for each cgroup.

$ sudo ./perf trace -as --bpf-summary --summary-mode=cgroup -- sleep 1

Summary of events:

perf trace: Support --summary-mode=cgroup

Add a new summary mode to collect stats for each cgroup.

$ sudo ./perf trace -as --bpf-summary --summary-mode=cgroup -- sleep 1

Summary of events:

cgroup /user.slice/user-657345.slice/user@657345.service/session.slice/org.gnome.Shell@x11.service, 535 events

syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
ppoll 15 0 373.600 0.004 24.907 197.491 55.26%
poll 15 0 1.325 0.001 0.088 0.369 38.76%
close 66 0 0.567 0.007 0.009 0.026 3.55%
write 150 0 0.471 0.001 0.003 0.010 3.29%
recvmsg 94 83 0.290 0.000 0.003 0.037 16.39%
ioctl 26 0 0.237 0.001 0.009 0.096 50.13%
timerfd_create 66 0 0.236 0.003 0.004 0.024 8.92%
timerfd_settime 70 0 0.160 0.001 0.002 0.012 7.66%
writev 10 0 0.118 0.001 0.012 0.019 18.17%
read 9 0 0.021 0.001 0.002 0.004 14.07%
getpid 14 0 0.019 0.000 0.001 0.004 20.28%

cgroup /system.slice/polkit.service, 94 events

syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
ppoll 22 0 19.811 0.000 0.900 9.273 63.88%
write 30 0 0.040 0.001 0.001 0.003 12.09%
recvmsg 12 0 0.018 0.001 0.002 0.006 28.15%
read 18 0 0.013 0.000 0.001 0.003 21.99%
poll 12 0 0.006 0.000 0.001 0.001 4.48%

cgroup /user.slice/user-657345.slice/user@657345.service/app.slice/app-org.gnome.Terminal.slice/gnome-terminal-server.service, 21 events

syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
ppoll 4 0 17.476 0.003 4.369 13.298 69.65%
recvmsg 15 12 0.068 0.002 0.005 0.014 26.53%
writev 1 0 0.033 0.033 0.033 0.033 0.00%
poll 1 0 0.005 0.005 0.005 0.005 0.00%

...

It works only for --bpf-summary for now.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20250501225337.928470-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

show more ...

perf trace: Implement syscall summary in BPF

When -s/--summary option is used, it doesn't need (augmented) arguments
of syscalls. Let's skip the augmentation and load another small BPF
program to c

perf trace: Implement syscall summary in BPF

When -s/--summary option is used, it doesn't need (augmented) arguments
of syscalls. Let's skip the augmentation and load another small BPF
program to collect the statistics in the kernel instead of copying the
data to the ring-buffer to calculate the stats in userspace. This will
be much more light-weight than the existing approach and remove any lost
events.

Let's add a new option --bpf-summary to control this behavior. I cannot
make it default because there's no way to get e_machine in the BPF which
is needed for detecting different ABIs like 32-bit compat mode.

No functional changes intended except for no more LOST events. :)

$ sudo ./perf trace -as --summary-mode=total --bpf-summary sleep 1

Summary of events:

total, 6194 events

syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
epoll_wait 561 0 4530.843 0.000 8.076 520.941 18.75%
futex 693 45 4317.231 0.000 6.230 500.077 21.98%
poll 300 0 1040.109 0.000 3.467 120.928 17.02%
clock_nanosleep 1 0 1000.172 1000.172 1000.172 1000.172 0.00%
ppoll 360 0 872.386 0.001 2.423 253.275 41.91%
epoll_pwait 14 0 384.349 0.001 27.453 380.002 98.79%
pselect6 14 0 108.130 7.198 7.724 8.206 0.85%
nanosleep 39 0 43.378 0.069 1.112 10.084 44.23%
...

Reviewed-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20250326044001.3503432-1-namhyung@kernel.org
[ Added fixup sent from Namhyung in response to my report to make it also dependent on CONFIG_TRACE ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

show more ...