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ecd4960d90
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Yang Jihong ecd4960d90 perf ftrace: Make system wide the default target for latency subcommand 
If no target is specified for 'latency' subcommand, the execution fails
because - 1 (invalid value) is written to set_ftrace_pid tracefs file.
Make system wide the default target, which is the same as the default
behavior of 'trace' subcommand.

Before the fix:

  # perf ftrace latency -T schedule
  failed to set ftrace pid

After the fix:

  # perf ftrace latency -T schedule
  ^C#   DURATION     |      COUNT | GRAPH                                          |
       0 - 1    us |          0 |                                                |
       1 - 2    us |          0 |                                                |
       2 - 4    us |          0 |                                                |
       4 - 8    us |       2828 | ####                                           |
       8 - 16   us |      23953 | ########################################       |
      16 - 32   us |        408 |                                                |
      32 - 64   us |        318 |                                                |
      64 - 128  us |          4 |                                                |
     128 - 256  us |          3 |                                                |
     256 - 512  us |          0 |                                                |
     512 - 1024 us |          1 |                                                |
       1 - 2    ms |          4 |                                                |
       2 - 4    ms |          0 |                                                |
       4 - 8    ms |          0 |                                                |
       8 - 16   ms |          0 |                                                |
      16 - 32   ms |          0 |                                                |
      32 - 64   ms |          0 |                                                |
      64 - 128  ms |          0 |                                                |
     128 - 256  ms |          4 |                                                |
     256 - 512  ms |          2 |                                                |
     512 - 1024 ms |          0 |                                                |
       1 - ...   s |          0 |                                                |

Fixes: 53be502822 ("perf ftrace: Add 'latency' subcommand")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230324032702.109964-1-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2023-04-04 09:39:55 -03:00
..
accounting
arch perf bench syscall: Add fork syscall benchmark 2023-04-04 09:39:55 -03:00
bootconfig tools/bootconfig: fix single & used for logical condition 2023-02-22 08:27:35 +09:00
bpf bpftool: Use bpf_{btf,link,map,prog}_get_info_by_fd() 2023-02-16 15:32:45 -08:00
build tools build: Add feature test for abi::__cxa_demangle 2023-03-14 08:29:46 -03:00
certs
cgroup tools:cgroup:memcg_shrinker remove redundant import 2023-01-18 17:12:59 -08:00
counter
debugging
edid
firewire
firmware
gpio tools: gpio: fix -c option of gpio-event-mon 2023-01-27 14:05:46 +01:00
hv
iio tools/iio/iio_utils:fix memory leak 2023-01-21 17:52:26 +00:00
include perf tools fixes for v6.3: 2023-03-10 08:18:46 -08:00
io_uring
kvm/kvm_stat
laptop
leds
lib perf record: Record dropped sample count 2023-03-15 11:08:35 -03:00
memory-model tools: memory-model: Make plain accesses carry dependencies 2023-01-03 20:47:04 -08:00
mm tools/mm: allow users to provide additional cflags/ldflags 2023-02-02 22:33:24 -08:00
net/ynl tools: ynl: fix enum-as-flags in the generic CLI 2023-03-08 23:28:21 -08:00
objtool Changes in this cycle were: 2023-03-02 09:45:34 -08:00
pci
pcmcia
perf perf ftrace: Make system wide the default target for latency subcommand 2023-04-04 09:39:55 -03:00
power platform-drivers-x86 for v6.3-1 2023-02-21 17:32:50 -08:00
rcu
scripts tools: Add LoongArch build infrastructure 2023-02-25 22:12:18 +08:00
spi
testing perf tests test_bridge_fdb_stress.sh: Fix redirection of stderr to stdin 2023-04-04 09:39:55 -03:00
thermal
time
tracing tracing updates for 6.3: 2023-02-23 10:20:49 -08:00
usb
verification tools/rv: Remove unneeded semicolon 2023-01-31 19:21:12 -05:00
virtio tools/virtio: enable to build with retpoline 2023-02-20 19:26:59 -05:00
wmi
Makefile