kernel/git/next/linux-next.git/tools/perf/arch, branch master

perf test amd ibs: avoid using executable heap

2026-07-04T16:24:02+00:00

Making [parts of] the heap executable is dangerous and is blocked by SELinux on Fedora/RHEL even for an unconfined user. Replace the malloc() + mprotect() combo with just mmap(), creating a private anonymous rwx mapping, which only requires the more commonly allowed "execmem" permission under SELinux (things like JIT or regex compilation need it as well). mmap() with MAP_ANONYMOUS will give us a zeroed mapping that begins on a page boundary, so the result is equivalent to the original code even without a memset() or the page-alignment dance. Verified that the test still passes on a machine with an AMD CPU that has the "ibs" CPU flag. Fixes: 35db59fa8ea2 ("perf test amd ibs: Add sample period unit test") Signed-off-by: Ondrej Mosnacek Reviewed-by: Ravi Bangoria Acked-by: Peter Zijlstra (Intel) Signed-off-by: Namhyung Kim

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 riscv: fix register name strings

2026-06-10T19:54:41+00:00

On risc-v, pref probe generates an invalid syntax for a named register in a kprobe. $ perf probe --debug verbose --add "n_tty_write tty" ... Writing event: p:probe/n_tty_write _text+8922528 tty=%"%a0":x64 Failed to write event: Invalid argument The problem is the combination of #define REG_DWARFNUM_NAME(reg, idx) [idx] = "%" #reg and entries such as REG_DWARFNUM_NAME("%a0", 10) where #reg will escape the quotes of the first macro parameter. Update the macro definition to produce the correct syntax for a named register in a kprobe, i.e. the unquoted register name with only one leading %. Fixes: a90c4519186dfc08 ("perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h") Reviewed-by: Ian Rogers Signed-off-by: Martin Kaiser Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf: Avoid redefinition warnings for REG_DWARFNUM_NAME

2026-06-10T19:53:35+00:00

dwarf-regs.c includes an arch-specific dwarf-regs-table.h for several architectures. This pulls in different definitions of REG_DWARFNUM_NAME and causes compiler warnings for W=1 builds. In file included from util/dwarf-regs.c:23: .../dwarf-regs-table.h:5: error: "REG_DWARFNUM_NAME" redefined [-Werror] #define REG_DWARFNUM_NAME(reg, idx) [idx] = reg Undefine REG_DWARFNUM_NAME before each new definition. Suggested-by: Arnaldo Carvalho de Melo Signed-off-by: Martin Kaiser Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo

perf arch common: Use perf_env e_machine rather than arch

2026-06-03T19:48:23+00:00

Use the e_machine rather than arch string matching. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Cc: Alexander Gordeev Cc: Heiko Carstens Cc: Honglei Wang Cc: Jan Polensky Cc: Sumanth Korikkar Cc: Thomas Richter Cc: Vasily Gorbik Signed-off-by: Arnaldo Carvalho de Melo

perf arm-spe: Don't warn about the discard bit if it doesn't exist

2026-05-30T00:20:50+00:00

Opening an SPE event shows a warning that doesn't concern the user: $ perf record -e arm_spe Unknown/empty format name: discard Perf only wants to know if the discard bit is set for configuring the event, not in response to anything the user has done. Fix it by adding another helper that returns if a config bit exists without warning. We should probably keep the warning in evsel__get_config_val() to avoid having every caller having to do it, and most format bits should never be missing. Add a test for the new helper. Rename the parent test function to be more generic rather than adding a new one as it requires a lot of boilerplate. Reviewed-by: Ian Rogers Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

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 arch arm: Sort includes and add missed explicit dependencies

2026-05-27T11:18:12+00:00

powerpc tools perf: Initialize error code in auxtrace_record_init function

2026-05-27T11:08:53+00:00

perf trace record fails some cases in powerpc # perf test "perf trace record and replay" 128: perf trace record and replay : FAILED! # perf trace record sleep 1 # echo $? 32 This is happening because of non-zero err value from auxtrace_record__init() function. static int record__auxtrace_init(struct record *rec) { int err; if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts) && record__threads_enabled(rec)) { pr_err("AUX area tracing options are not available in parallel streaming mode.\n"); return -EINVAL; } if (!rec->itr) { rec->itr = auxtrace_record__init(rec->evlist, &err); if (err) return err; } Here "int err" is not initialised. The code expects "err" to be set from auxtrace_record__init() function. Update auxtrace_record__init() in arch/powerpc/util/auxtrace.c to clear err value in the beginning. - Clear err value in beginning of function. Any fail later will set appropriate return code to err. - Even if we haven't found any event for auxtrace, perf record should continue for other events. NULL return will indicate that there is no auxtrace record initialized. - Not having "err" set here will affect monitoring of other events also because perf record will fail seeing random value in err. Set err to -EINVAL before invoking auxtrace_record__init() in builtin-record.c With the fix, # perf trace record sleep 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.033 MB perf.data (228 samples) ] Fixes: 1dbfaf94cf66ec4b ("perf powerpc: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpc") Reviewed-by: Adrian Hunter Signed-off-by: Athira Rajeev Acked-by: Namhyung Kim Cc: Athira Rajeev Cc: Hari Bathini Cc: Ian Rogers Cc: Jiri Olsa Cc: linuxppc-dev@lists.ozlabs.org Cc: Madhavan Srinivasan Cc: Michael Petlan Cc: Shivani Nittor Cc: Tanushree Shah Cc: Tejas Manhas Cc: Thomas Richter Signed-off-by: Arnaldo Carvalho de Melo