linux.git/tools/lib/perf, branch v6.6.132

libperf build: Always place libperf includes first

2026-03-04T12:20:31+00:00

[ Upstream commit 8c5b40678c63be6b85f1c2dc8c8b89d632faf988 ]

When building tools/perf the CFLAGS can contain a directory for the
installed headers.

As the headers may be being installed while building libperf.a this can
cause headers to be partially installed and found in the include path
while building an object file for libperf.a.

The installed header may reference other installed headers that are
missing given the partial nature of the install and then the build fails
with a missing header file.

Avoid this by ensuring the libperf source headers are always first in
the CFLAGS.

Fixes: 3143504918105156 ("libperf: Make libperf.a part of the perf build")
Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Sasha Levin

libperf: Don't remove -g when EXTRA_CFLAGS are used

2026-03-04T12:20:30+00:00

[ Upstream commit f5b07010c13c77541e8ade167d05bef3b8a63739 ]

When using EXTRA_CFLAGS, for example "EXTRA_CFLAGS=-DREFCNT_CHECKING=1",
this construct stops setting -g which you'd expect would not be affected
by adding extra flags. Additionally, EXTRA_CFLAGS should be the last
thing to be appended so that it can be used to undo any defaults. And no
condition is required, just += appends to any existing CFLAGS and also
appends or doesn't append EXTRA_CFLAGS if they are or aren't set.

It's not clear why DEBUG=1 is required for -g in Perf when in libperf
it's always on, but I don't think we need to change that behavior now
because someone may be depending on it.

Signed-off-by: James Clark 
Reviewed-by: Ian Rogers 
Link: https://lore.kernel.org/r/20250319114009.417865-1-james.clark@linaro.org
Signed-off-by: Namhyung Kim 
Stable-dep-of: 8c5b40678c63 ("libperf build: Always place libperf includes first")
Signed-off-by: Sasha Levin

libperf cpumap: Fix perf_cpu_map__max for an empty/NULL map

2026-01-11T14:21:53+00:00

[ Upstream commit a0a4173631bfcfd3520192c0a61cf911d6a52c3a ]

Passing an empty map to perf_cpu_map__max triggered a SEGV. Explicitly
test for the empty map.

Reported-by: Ingo Molnar 
Closes: https://lore.kernel.org/linux-perf-users/aSwt7yzFjVJCEmVp@gmail.com/
Tested-by: Ingo Molnar 
Signed-off-by: Ian Rogers 
Tested-by: Thomas Richter 
Signed-off-by: Namhyung Kim 
Signed-off-by: Sasha Levin

libperf event: Ensure tracing data is multiple of 8 sized

2025-10-19T14:30:40+00:00

[ Upstream commit b39c915a4f365cce6bdc0e538ed95d31823aea8f ]

Perf's synthetic-events.c will ensure 8-byte alignment of tracing
data, writing it after a perf_record_header_tracing_data event.

Add padding to struct perf_record_header_tracing_data to make it 16-byte
rather than 12-byte sized.

Fixes: 055c67ed39887c55 ("perf tools: Move event synthesizing routines to separate .c file")
Reviewed-by: James Clark 
Signed-off-by: Ian Rogers 
Acked-by: Namhyung Kim 
Tested-by: Arnaldo Carvalho de Melo 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Athira Rajeev 
Cc: Blake Jones 
Cc: Chun-Tse Shao 
Cc: Collin Funk 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: Jan Polensky 
Cc: Jiri Olsa 
Cc: Kan Liang 
Cc: Li Huafei 
Cc: Mark Rutland 
Cc: Nam Cao 
Cc: Peter Zijlstra 
Cc: Steinar H. Gunderson 
Cc: Thomas Gleixner 
Link: https://lore.kernel.org/r/20250821163820.1132977-6-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Sasha Levin

perf evlist: Add perf_evlist__go_system_wide() helper

2024-06-12T09:13:02+00:00

commit f6ff1c760431be34e4daaa44f242be911becd998 upstream.

For dummy events that keep tracking, we may need to modify its cpu_maps.

For example, change the cpu_maps to record sideband events for all CPUS.

Add perf_evlist__go_system_wide() helper to support this scenario.

Signed-off-by: Yang Jihong 
Acked-by: Adrian Hunter 
Tested-by: Ravi Bangoria 
Cc: Alexander Shishkin 
Cc: Andi Kleen 
Cc: Anshuman Khandual 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Kan Liang 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Link: https://lore.kernel.org/r/20230904023340.12707-2-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Greg Kroah-Hartman

libperf evlist: Avoid out-of-bounds access

2024-04-13T11:07:36+00:00

[ Upstream commit 1947b92464c3268381604bbe2ac977a3fd78192f ]

Parallel testing appears to show a race between allocating and setting
evsel ids. As there is a bounds check on the xyarray it yields a segv
like:

```
AddressSanitizer:DEADLYSIGNAL

=================================================================

==484408==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010

==484408==The signal is caused by a WRITE memory access.

==484408==Hint: address points to the zero page.

    #0 0x55cef5d4eff4 in perf_evlist__id_hash tools/lib/perf/evlist.c:256
    #1 0x55cef5d4f132 in perf_evlist__id_add tools/lib/perf/evlist.c:274
    #2 0x55cef5d4f545 in perf_evlist__id_add_fd tools/lib/perf/evlist.c:315
    #3 0x55cef5a1923f in store_evsel_ids util/evsel.c:3130
    #4 0x55cef5a19400 in evsel__store_ids util/evsel.c:3147
    #5 0x55cef5888204 in __run_perf_stat tools/perf/builtin-stat.c:832
    #6 0x55cef5888c06 in run_perf_stat tools/perf/builtin-stat.c:960
    #7 0x55cef58932db in cmd_stat tools/perf/builtin-stat.c:2878
...
```

Avoid this crash by early exiting the perf_evlist__id_add_fd and
perf_evlist__id_add is the access is out-of-bounds.

Signed-off-by: Ian Rogers 
Cc: Yang Jihong 
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240229070757.796244-1-irogers@google.com
Signed-off-by: Sasha Levin

libperf rc_check: Make implicit enabling work for GCC

2023-11-20T10:59:29+00:00

[ Upstream commit 75265320d290c5f5891f16967b94883676c46705 ]

Make the implicit REFCOUNT_CHECKING robust to when building with GCC.

Fixes: 9be6ab181b7b ("libperf rc_check: Enable implicitly with sanitizers")
Signed-off-by: Ian Rogers 
Cc: K Prateek Nayak 
Cc: Ravi Bangoria 
Cc: Sandipan Das 
Cc: Anshuman Khandual 
Cc: German Gomez 
Cc: James Clark 
Cc: Nick Terrell 
Cc: Sean Christopherson 
Cc: Changbin Du 
Cc: liuwenyu 
Cc: Yang Jihong 
Cc: Masami Hiramatsu 
Cc: Miguel Ojeda 
Cc: Song Liu 
Cc: Leo Yan 
Cc: Kajol Jain 
Cc: Andi Kleen 
Cc: Kan Liang 
Cc: Athira Rajeev 
Cc: Yanteng Si 
Cc: Liam Howlett 
Cc: Paolo Bonzini 
Link: https://lore.kernel.org/r/20231024222353.3024098-4-irogers@google.com
Signed-off-by: Namhyung Kim 
Signed-off-by: Sasha Levin

libperf: Get rid of attr.id field

2023-08-29T17:16:14+00:00

Now there's no in-tree user of the field.  To remove the possible bug
later, let's get rid of the 'id' field and add a comment for that.

Signed-off-by: Namhyung Kim 
Cc: Adrian Hunter 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Peter Zijlstra 
Link: https://lore.kernel.org/r/20230825152552.112913-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

libperf: Add perf_record_header_attr_id()

2023-08-29T17:16:14+00:00

The HEADER_ATTR record has an event attr followed by the id array.  But
perf data from a different version could have different size of attr.

So it cannot just use event->attr.id to access the array.  Let's add the
perf_record_header_attr_id() macro to calculate the start of the array.

Signed-off-by: Namhyung Kim 
Cc: Adrian Hunter 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Peter Zijlstra 
Link: https://lore.kernel.org/r/20230825152552.112913-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

libperf: Implement riscv mmap support

2023-08-16T11:52:47+00:00

riscv now supports mmaping hardware counters so add what's needed to
take advantage of that in libperf.

Reviewed-by: Andrew Jones 
Reviewed-by: Atish Patra 
Reviewed-by: Ian Rogers 
Signed-off-by: Alexandre Ghiti 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Anup Patel 
Cc: Atish Patra 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Rob Herring 
Cc: Rémi Denis-Courmont 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
Link: https://lore.kernel.org/r/20230802080328.1213905-10-alexghiti@rivosinc.com
Signed-off-by: Arnaldo Carvalho de Melo