kernel/git/next/linux-next.git/tools/perf/util/print-events.c, branch master

perf evsel: Add reference count

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

As with evlist 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 evsels, but this has issues if events are opened, etc. leading to assertion failures. With a reference count the same evsel can be used and the reference count incremented for the python usage. To not change the python evsel API getset functions are added for the evsel members, no set function is provided for size as it doesn't make sense to alter this. 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 list: Don't write to const memory

2026-01-21T14:01:22+00:00

Something now detected on fedora 44, where strchr() returns const if it is passed a const pointer: util/print-events.c: In function 'print_sdt_events': util/print-events.c:89:29: error: initialization discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] 89 | char *bid = strchr(sdt_name->s, '@'); | ^~~~~~ Fix it by using strchrnul() + strncmp() instead of temporarily scrubbing it with '\0'. Reviewed-by: Ian Rogers Suggested-by: David Laight Link: https://lore.kernel.org/r/20260121112536.27fd5d11@pumpkin Signed-off-by: Arnaldo Carvalho de Melo

perf list: Signal changing const memory is ok

2026-01-21T13:46:50+00:00

In this case its a temp list that is created just for listing events and will be deleted at the end, so just cast it to get rid of the compiler warning. Reviewed-by: Ian Rogers Signed-off-by: Arnaldo Carvalho de Melo

perf print-events: Remove print_symbol_events

2025-10-15T14:59:11+00:00

Now legacy hardware events are in json there's no need for a specific printing routine that previously served for both hardware and software events. The associated event_symbols_hw is also removed. To support the previous filtered version use an event glob of "legacy hardware" which matches the topic of the json events. Tested-by: Thomas Richter Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf print-events: Remove print_hwcache_events

2025-10-15T14:59:11+00:00

Now legacy cache events are in json there's no need for a specific printing routine. To support the previous filtered version use an event glob of "legacy cache" which matches the topic of the json events. Tested-by: Thomas Richter Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf list: Skip ABI PMUs when printing pmu values

2025-07-26T23:31:43+00:00

Avoid printing tracepoint, legacy and software events when listing for the pmu option. Add the PMU type to the print_event callbacks to ease detection. Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Link: https://lore.kernel.org/r/20250725185202.68671-8-irogers@google.com Signed-off-by: Namhyung Kim

perf list: Remove tracepoint printing code

2025-07-26T23:31:43+00:00

Now that the tp_pmu can iterate and describe events remove the custom tracepoint printing logic, this avoids perf list showing the tracepoint events twice. Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Link: https://lore.kernel.org/r/20250725185202.68671-7-irogers@google.com Signed-off-by: Namhyung Kim

perf parse-events: Remove non-json software events

2025-07-26T23:31:43+00:00

Remove the hard coded encodings from parse-events. This has the consequence that software events are matched using the sysfs/json priority, will be case insensitive and will be wildcarded across PMUs. As there were software and hardware types in the parsing code, the removal means software vs hardware logic can be removed and hardware assumed. Now the perf json provides detailed descriptions of software events, remove the previous listing support that didn't contain event descriptions. When globbing is required for the "sw" option in perf list, use string PMU globbing as was done previously for the tool PMU. The output of `perf list sw` command changed like this. Before: List of pre-defined events (to be used in -e or -M): alignment-faults [Software event] bpf-output [Software event] cgroup-switches [Software event] context-switches OR cs [Software event] cpu-clock [Software event] cpu-migrations OR migrations [Software event] dummy [Software event] emulation-faults [Software event] major-faults [Software event] minor-faults [Software event] page-faults OR faults [Software event] task-clock [Software event] After: List of pre-defined events (to be used in -e or -M): software: alignment-faults [Number of kernel handled memory alignment faults. Unit: software] bpf-output [An event used by BPF programs to write to the perf ring buffer. Unit: software] cgroup-switches [Number of context switches to a task in a different cgroup. Unit: software] context-switches [Number of context switches [This event is an alias of cs]. Unit: software] cpu-clock [Per-CPU high-resolution timer based event. Unit: software] cpu-migrations [Number of times a process has migrated to a new CPU [This event is an alias of migrations]. Unit: software] cs [Number of context switches [This event is an alias of context-switches]. Unit: software] dummy [A placeholder event that doesn't count anything. Unit: software] ... Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Link: https://lore.kernel.org/r/20250725185202.68671-4-irogers@google.com Signed-off-by: Namhyung Kim

perf metricgroup: Factor out for-each function and move out printing

2025-07-11T19:36:40+00:00

Factor metricgroup__for_each_metric into its own function handling regular and sys metrics. Make the metric adding and printing code use it, move the printing code into print-events files. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250710235126.1086011-6-irogers@google.com Signed-off-by: Namhyung Kim

perf evsel: Missed close() when probing hybrid core PMUs

2025-06-17T19:55:24+00:00

Add missing close() to avoid leaking perf events. In past perfs this mattered little as the function was just used by 'perf list'. As the function is now used to detect hybrid PMUs leaking the perf event is somewhat more painful. Fixes: b41f1cec91c37eee ("perf list: Skip unsupported events") Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Ingo Molnar Cc: Jiapeng Chong Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Michael Petlan Cc: Namhyung Kim Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Tiezhu Yang Link: https://lore.kernel.org/r/20250614004108.1650988-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo