linux-toradex.git/tools/perf/arch/x86/util, branch master

perf evlist: Add reference count checking

2026-06-30T17:17:11+00:00

Now the evlist is reference counted, add reference count checking so
that gets and puts are paired and easy to debug. Reference count
checking is documented here:
https://perfwiki.github.io/main/reference-count-checking/

This large patch is adding accessors to evlist functions and switching
to their use. There was some minor renaming as evlist__mmap is now an
accessor to the mmap variable, and the original evlist__mmap is
renamed to evlist__do_mmap.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alice Rogers 
Cc: Dapeng Mi 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

perf evlist: Add reference count

2026-06-30T17:17:10+00:00

This a no-op for most of the perf tool. The reference count is set to
1 at allocation, the put will see the 1, decrement it and perform the
delete.

The purpose for adding the reference count is for the python code. Prior
to this change the python code would clone evlists, but this has issues
if events are opened, etc.

This change adds a reference count for the evlists and a later change
will add it to evsels. The combination is needed for the python code to
operate correctly (not hit asserts in the evsel clone), but the changes
are broken apart for the sake of smaller patches.

Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alice Rogers 
Cc: Dapeng Mi 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

perf arch x86: Sort includes and add missed explicit dependencies

2026-05-27T11:20:14+00:00

Fix missing #includes found while cleaning the evsel/evlist header
files. Sort the remaining header files for consistency with the rest
of the code.

Signed-off-by: Ian Rogers 
Acked-by: Namhyung Kim 
Cc: Adrian Hunter 
Cc: Alice Rogers 
Cc: Dapeng Mi 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Leo Yan 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Signed-off-by: Arnaldo Carvalho de Melo

perf unwind-libunwind: Make libunwind register reading cross platform

2026-05-15T19:18:36+00:00

Move the libunwind register to perf register mapping functions in
arch/../util/unwind-libunwind.c into a new libunwind-arch
directory. Rename the functions to
__get_perf_regnum_for_unw_regnum_. Add untested ppc32 and s390
functions. Add a get_perf_regnum_for_unw_regnum function that takes an
ELF machine as well as a register number and chooses the appropriate
architecture implementation.

Split the x86 and powerpc 32 and 64-bit implementations apart so that
a single libunwind-.h header is included.

Move the e_machine into the unwind_info struct to make it easier to
pass.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: Athira Rajeev 
Cc: Dapeng Mi 
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Florian Fainelli 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Li Guan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Shimin Guo 
Cc: Thomas Richter 
Cc: Tomas Glozar 
Cc: Will Deacon 
[ Map UNW_PPC32_NIP to PERF_REG_POWERPC_NIP like done for 64-bit, pointed out by a local sashiko ]
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Use calloc() where applicable

2026-04-09T02:21:05+00:00

Instead of using zalloc(nr_entries * sizeof_entry) that is what calloc()
does.

In some places where linux/zalloc.h isn't needed, remove it, add when
needed and was getting it indirectly.

Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

libperf cpumap: Make index and nr types unsigned

2026-04-01T21:50:53+00:00

The index into the cpumap array and the number of entries within the
array can never be negative, so let's make them unsigned. This is
prompted by reports that gcc 13 with -O6 is giving a
alloc-size-larger-than errors. The change makes the cpumap changes and
then updates the declaration of index variables throughout perf and
libperf to be unsigned. The two things are hard to separate as
compiler warnings about mixing signed and unsigned types breaks the
build.

Reported-by: Chingbin Li 
Closes: https://lore.kernel.org/lkml/20260212025127.841090-1-liqb365@163.com/
Tested-by: Chingbin Li 
Signed-off-by: Ian Rogers 
Signed-off-by: Namhyung Kim

perf pmu: Replace starts_with with strstarts

2026-03-04T01:04:49+00:00

linux/string.h provides strstarts that matches the starts_with
function. For style and consistency reasons remove the starts_with
functions and use strstarts.

Signed-off-by: Ian Rogers 
Reviewed-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

perf regs: Remove __weak attributive arch_sdt_arg_parse_op() function

2026-02-06T15:16:12+00:00

In line with the previous patch, the __weak arch_sdt_arg_parse_op()
function is removed.

Architectural-specific implementations in the arch/ directory are now
converted into sub-functions within the util/perf-regs-arch/ directory.

The perf_sdt_arg_parse_op() function will call these sub-functions based
on the EM_HOST.

This change enables cross-architecture calls to arch_sdt_arg_parse_op().

No functional changes are intended.

Suggested-by: Ian Rogers 
Reviewed-by: Ian Rogers 
Signed-off-by: Dapeng Mi 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Guo Ren 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: John Garry 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Thomas Falcon 
Cc: Will Deacon 
Cc: Xudong Hao 
Cc: Zide Chen 
[ Fixed up somme fuzz with powerpc and x86 Build files wrt removing perf_regs.o ]
Signed-off-by: Arnaldo Carvalho de Melo

perf regs: Remove weak attributive archxxx_reg_mask() functions

2026-02-06T15:16:09+00:00

Currently, some architecture-specific perf-regs functions, such as
arch__intr_reg_mask() and arch__user_reg_mask(), are defined with the
__weak attribute.

This approach ensures that only functions matching the architecture of
the build/run host are compiled and executed, reducing build time and
binary size.

However, this __weak attribute restricts these functions to be called
only on the same architecture, preventing cross-architecture
functionality.

For example, a perf.data file captured on x86 cannot be parsed on an ARM
platform.

To address this limitation, this patch removes the __weak attribute from
these perf-regs functions.

The architecture-specific code is moved from the arch/ directory to the
util/perf-regs-arch/ directory.

The appropriate architectural functions are then called based on the
EM_HOST.

No functional changes are intended.

Suggested-by: Ian Rogers 
Reviewed-by: Ian Rogers 
Signed-off-by: Dapeng Mi 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Guo Ren 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: John Garry 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Thomas Falcon 
Cc: Will Deacon 
Cc: Xudong Hao 
Cc: Zide Chen 
[ Fixed up somme fuzz with s390 and riscv Build files wrt removing perf_regs.o ]
Signed-off-by: Arnaldo Carvalho de Melo

perf kvm stat: Remove use of the arch directory

2026-02-03T21:01:27+00:00

`perf kvm stat` supports record and report options.

By using the arch directory a report for a different machine type cannot
be supported.

Move the kvm-stat code out of the arch directory and into
util/kvm-stat-arch following the pattern of perf-regs and dwarf-regs.

Avoid duplicate symbols by renaming functions to have the architecture
name within them.

For global variables, wrap them in an architecture specific function.
Selecting the architecture to use with `perf kvm stat` is selected by
EM_HOST, ie no different than before the change.

Later the ELF machine can be determined from the session or a header
feature (ie EM_HOST at the time of the record).

The build and #define HAVE_KVM_STAT_SUPPORT is now redundant so remove
across Makefiles and in the build.

Opportunistically constify architectural structs and arrays.

Signed-off-by: Ian Rogers 
Cc: Aditya Bodkhe 
Cc: Adrian Hunter 
Cc: Albert Ou 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andi Kleen 
Cc: Andrew Jones 
Cc: Anubhav Shelat 
Cc: Anup Patel 
Cc: Athira Rajeev 
Cc: Blake Jones 
Cc: Chun-Tse Shao 
Cc: Dapeng Mi 
Cc: Dmitriy Vyukov 
Cc: Howard Chu 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Peter Zijlstra 
Cc: Quan Zhou 
Cc: Shimin Guo 
Cc: Swapnil Sapkal 
Cc: Thomas Falcon 
Cc: Will Deacon 
Cc: Yunseong Kim 
Signed-off-by: Arnaldo Carvalho de Melo