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perf report: Support folded callchain mode on --stdio

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Add new call chain option (-g) 'folded' to print callchains in a line.
The callchains are separated by semicolons, and preceded by (absolute)
percent values and a space.

For example, the following 20 lines can be printed in 3 lines with the
folded output mode:

  $ perf report -g flat --no-children | grep -v ^# | head -20
      60.48%  swapper  [kernel.vmlinux]  [k] intel_idle
              54.60%
                 intel_idle
                 cpuidle_enter_state
                 cpuidle_enter
                 call_cpuidle
                 cpu_startup_entry
                 start_secondary

              5.88%
                 intel_idle
                 cpuidle_enter_state
                 cpuidle_enter
                 call_cpuidle
                 cpu_startup_entry
                 rest_init
                 start_kernel
                 x86_64_start_reservations
                 x86_64_start_kernel

  $ perf report -g folded --no-children | grep -v ^# | head -3
      60.48%  swapper  [kernel.vmlinux]  [k] intel_idle
  54.60% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
  5.88% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel

This mode is supported only for --stdio now and intended to be used by
some scripts like in FlameGraphs[1].  Support for other UI might be
added later.

[1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html

Requested-and-Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1447047946-1691-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2015-11-09 14:45:37 +09:00
committed by Arnaldo Carvalho de Melo
parent 566c69c36e
commit 26e779245d
4 changed files with 65 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
tools/perf/ui/stdio/hist.c
View File

@ -260,6 +260,58 @@ static size_t callchain__fprintf_flat(FILE *fp, struct rb_root *tree,
return ret;
}
static size_t __callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
{
const char *sep = symbol_conf.field_sep ?: ";";
struct callchain_list *chain;
size_t ret = 0;
char bf[1024];
bool first;
if (!node)
return 0;
ret += __callchain__fprintf_folded(fp, node->parent);
first = (ret == 0);
list_for_each_entry(chain, &node->val, list) {
if (chain->ip >= PERF_CONTEXT_MAX)
continue;
ret += fprintf(fp, "%s%s", first ? "" : sep,
callchain_list__sym_name(chain,
bf, sizeof(bf), false));
first = false;
}
return ret;
}
static size_t callchain__fprintf_folded(FILE *fp, struct rb_root *tree,
u64 total_samples)
{
size_t ret = 0;
u32 entries_printed = 0;
struct callchain_node *chain;
struct rb_node *rb_node = rb_first(tree);
while (rb_node) {
double percent;
chain = rb_entry(rb_node, struct callchain_node, rb_node);
percent = chain->hit * 100.0 / total_samples;
ret += fprintf(fp, "%.2f%% ", percent);
ret += __callchain__fprintf_folded(fp, chain);
ret += fprintf(fp, "\n");
if (++entries_printed == callchain_param.print_limit)
break;
rb_node = rb_next(rb_node);
}
return ret;
}
static size_t hist_entry_callchain__fprintf(struct hist_entry *he,
u64 total_samples, int left_margin,
FILE *fp)
@ -278,6 +330,9 @@ static size_t hist_entry_callchain__fprintf(struct hist_entry *he,
case CHAIN_FLAT:
return callchain__fprintf_flat(fp, &he->sorted_chain, total_samples);
break;
case CHAIN_FOLDED:
return callchain__fprintf_folded(fp, &he->sorted_chain, total_samples);
break;
case CHAIN_NONE:
break;
default: