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  1. 25 1月, 2018 29 次提交
  3. 23 1月, 2018 9 次提交
  5. 19 1月, 2018 1 次提交
    • A
      perf bpf: Don't warn about unavailability of builtin clang, just fallback · 87252323
      由 Arnaldo Carvalho de Melo 提交于 
      When clang is not linked with 'perf' we should just add a debug message
about that before doing the fallback to calling the external compiler.

I.e. just the "-95" warning below gets turned into a debug message:

  # cat sys_enter_open.c
  #include "bpf.h"

  SEC("syscalls:sys_enter_open")
  int func(void *ctx)
  {
	struct {
		char *ptr;
		char path[256];
	} filename = {
		.ptr = *((char **)(ctx + 16)),
	};
	int len = bpf_probe_read_str(filename.path, sizeof(filename.path), filename.ptr);
	if (len > 0) {
		if (len == 1)
			perf_event_output(ctx, &__bpf_stdout__, BPF_F_CURRENT_CPU, &filename, len + sizeof(filename.ptr));
		else if (len < 256)
			perf_event_output(ctx, &__bpf_stdout__, BPF_F_CURRENT_CPU, &filename, len + sizeof(filename.ptr));
        }
	return 0;
  }
  # trace -e open,sys_enter_open.c
  bpf: builtin compilation failed: -95, try external compiler
     0.000 (         ): __bpf_stdout__:@......./proc/self/task/11160/comm..)
     0.014 ( 0.116 ms): qemu-system-x8/6721 open(filename: /proc/self/task/11160/comm, flags: RDWR) = 91
  2335.411 (         ): __bpf_stdout__:FB..~.../etc/resolv.conf....)
  2335.421 ( 0.030 ms): chronyd/883 open(filename: /etc/resolv.conf, flags: CLOEXEC) = 5
^C#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-z5aak9oay448ffj37giz94yr@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      87252323
  7. 18 1月, 2018 1 次提交
    • A
      perf tools: Use ui__error() for reporting --fields errors · 56271170
      由 Arnaldo Carvalho de Melo 提交于 
      So that we can get it working for TUI, where using just pr_err() would
end up making the message emitted to stderr to be erased by the TUI exit
routine restoring the terminal to its previous state.

Now we can see that trying to use a tracepoint field as one of the
--field entries isn't working:

  # perf top --stdio --no-children -e syscalls:sys_enter_write --fields pid,sym,count
  Error:
  Unknown --fields key: `count'
   Usage: perf top [<options>]

        --fields <key[,keys...]>
                          output field(s): overhead, period, sample plus all of sort keys
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-usy9hhy7umdd4bbblkn63t8w@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      56271170