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4 Commits

Author SHA1 Message Date
Arnaldo Carvalho de Melo
0341eab66b perf tp_pmu: Address const-correctness errors in recent glibcs 
To avoid having more variables, just cast the const variable searched to
non-const since the result will not be modified, its only later that
that variable will be used to modify something, but then its non-const
memory being modified, so using a cast is the cheapest thing here.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 2026-01-27 02:22:00 -03:00
Ian Rogers
9105df0185 perf tp_pmu: Remove unnecessary check 
The "if" condition is also part of the "while" condition, remove the
"if" to reduce the amount of code.

Reported-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Chun-Tse Shao <ctshao@google.com>
Cc: Collin Funk <collin.funk1@gmail.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Gautam Menghani <gautam@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20250819013941.209033-12-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 2025-09-03 12:34:55 -03:00
Ian Rogers
45b6e281cb perf tp_pmu: Add event APIs 
Add event APIs for the tracepoint PMU allowing things like perf list
to function using it. For perf list add the tracepoint format in the
long description (shown with -v).

  $ sudo perf list -v tracepoint

  List of pre-defined events (to be used in -e or -M):

    alarmtimer:alarmtimer_cancel                       [Tracepoint event]
         [name: alarmtimer_cancel
          ID: 416
          format:
          field:unsigned short common_type; offset:0; size:2; signed:0;
          field:unsigned char common_flags; offset:2; size:1; signed:0;
          field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
          field:int common_pid; offset:4; size:4; signed:1;
          field:void * alarm; offset:8; size:8; signed:0;
          field:unsigned char alarm_type; offset:16; size:1; signed:0;
          field:s64 expires; offset:24; size:8; signed:1;
          field:s64 now; offset:32; size:8; signed:1;
          print fmt: "alarmtimer:%p type:%s expires:%llu now:%llu",REC->alarm,__print_flags((1 << REC->alarm_type)," | ",{ 1 << 0,
          "REALTIME" },{ 1 << 1,"BOOTTIME" },{ 1 << 3,"REALTIME Freezer" },{ 1 << 4,"BOOTTIME Freezer" }),REC->expires,REC->now
          . Unit: tracepoint]
    alarmtimer:alarmtimer_fired                        [Tracepoint event]
         [name: alarmtimer_fired
          ID: 418
          ...

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20250725185202.68671-6-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
 2025-07-26 16:31:43 -07:00
Ian Rogers
d002aab87d perf tp_pmu: Factor existing tracepoint logic to new file 
Start the creation of a tracepoint PMU abstraction. Tracepoint events
don't follow the regular sysfs perf conventions. Eventually the new
PMU abstraction will bridge the gap so tracepoint events look more
like regular perf ones.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20250725185202.68671-5-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
 2025-07-26 16:31:43 -07:00