Merge tag 'perf-tools-for-v7.3-2026-08-21' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

Pull perf tools updates from Namhyung Kim:
"perf c2c:

- Add 'function view' in perf c

Merge tag 'perf-tools-for-v7.3-2026-08-21' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

Pull perf tools updates from Namhyung Kim:
"perf c2c:

- Add 'function view' in perf c2c report TUI (switched by pressing
'TAB' in the cacheline view) to organize samples around functions
rather than cachelines in 3-level hierarchy:

Level 1: Read-side function (sorted by estimated Cycles %)
Level 2: Contending writer functions (sorted by Store count)
Level 3: Shared cacheline addresses

Users can navigate the entries and fold/unfold using 'e' key. An
example output would look like below:

Shared Data Functions Table (19 entries, sorted on Cycles %)
Cycles Store
% count Function / Contending function / Cacheline
----------------------------------------------------------------------
+ 35.67% 876 + [k] cpupri_set
+ 24.31% 424 + [k] pull_rt_task
- 16.53% 555 - [k] dequeue_pushable_task
145 - [k] pull_rt_task
145 0xff2d0082809da080
139 - [k] enqueue_pushable_task
70 0xff2d00a2071f9640
69 0xff2d0082809da000

python module support:

- Extend "perf" python module so that it can be fully functional. The
goal is to run scripts directly, not by 'perf script' command. This
would give better performance as well as more control to build
standalone programs with UI.

- Add LiveSession helper (perf_live.py) to enable live event
collection directly from Python using perf.evlist and
perf.parse_events.

perf stat:

- Add --hide-zero-events option to suppress zero-count events
- Reject conflicting --field-separator and --json-output options
- Fix duplicate event output with --for-each-cgroup

perf sched latency:

- Add -H/--histogram and --hist-mode (log|linear) options to show
scheduler wait latency histograms
- Add --time option to filter analysis by time span in 'perf sched
latency'

ARM CoreSight:

- Synthesize callchains for instruction samples from CoreSight trace
using thread stack ('--itrace=g...')
- Support call indentation ('perf script -F +callindent') to display
call depth hierarchy on branch samples
- Decode ETE (Embedded Trace Extension) exception packets

Build system:

- Add 'make install-build-deps' target to install required packages
- Parallelize JSON and metric pre-computation in jevents.py for
faster builds

Vendor event/metric updates:

- Add Intel Nova Lake events and update tables for existing models
- Update AMD Zen 5 and Zen 6 core events
- Update Arm64 Tegra410 metrics and PowerPC hcalls

Internal changes and fixes:

- Harden trace-event and synthetic event parsing against corrupted
data
- Fix unwinding of multi-threaded processes in libdw unwinder
- Fix memory leaks in various commands and python bindings
- Speed up 'perf test' shell tests"

* tag 'perf-tools-for-v7.3-2026-08-21' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (232 commits)
perf vendor events arm64: Fix Tegra410 Olympus event 0x0197
perf vendor events arm64: fix swapped MetricGroup for Tegra410 L1 prefetcher metrics
perf evlist: Warn when 'sleep' workload is used without system-wide (-a) option
perf c2c: document function view in perf-c2c man page
perf c2c: add function view browser UI and cacheline detail
perf c2c: build and finalize the function view hierarchy
perf c2c: add function view hierarchy entry creation
perf c2c: add function view stats merge and memory management
perf c2c: add HPP list parsing for function view columns
perf c2c: add column rendering for function view
perf c2c: add function view model skeleton
perf c2c: extract shared data structures into util/c2c.h
perf test sample-parsing: Validate PERF_FORMAT_GROUP values without LOST
perf dso: Replace assert with runtime check in dso__read_symbol()
perf dso: Guard against cache underflow on short reads in dso_cache__memcpy()
perf dso: Use stored fd error instead of stale errno in file_read() and file_size()
perf dso: Guard close() against invalid fd in dso__decompress_kmodule_path()
perf dso: Guard against errno==0 when dso__get_filename() returns NULL
perf build: install-build-deps: add RHEL family devel package mapping
perf build: Remove leftover feature tests for removed cxx and clang support
...

show more ...

perf test: Add Arm CoreSight callchain test

Add a CoreSight shell test for synthesized callchains.

The test uses the new callchain workload to generate trace and decodes
it with synthesis callchain

perf test: Add Arm CoreSight callchain test

Add a CoreSight shell test for synthesized callchains.

The test uses the new callchain workload to generate trace and decodes
it with synthesis callchain. It then verifies that the instruction
samples show the expected callchain push and pop.

Use control FIFOs so tracing starts only around the workload, which
keeps the trace data small. The test is limited to with the cs_etm
event available and root permission.

After:

perf test 138 -vvv
138: CoreSight synthesized callchain:
---- start ----
test child forked, pid 35581
Callchain flow matched:
l1=4642868 l2=4642880 l3=4642895 l4=4642919 l5=4670494 l6=4670500 l7=4670520
---- end(0) ----
138: CoreSight synthesized callchain : Ok

Assisted-by: Codex:GPT-5.5
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

show more ...