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e8536dd47a
In addition to showing it exponentially, using log2() to figure out the
histogram index, allow for showing it linearly:
The preexisting more, the default:
# perf ftrace latency --use-nsec --use-bpf \
-T switch_mm_irqs_off -a sleep 2
# DURATION | COUNT | GRAPH |
0 - 1 ns | 0 | |
1 - 2 ns | 0 | |
2 - 4 ns | 0 | |
4 - 8 ns | 0 | |
8 - 16 ns | 0 | |
16 - 32 ns | 0 | |
32 - 64 ns | 0 | |
64 - 128 ns | 238 | # |
128 - 256 ns | 1704 | ########## |
256 - 512 ns | 672 | ### |
512 - 1024 ns | 4458 | ########################## |
1 - 2 us | 677 | #### |
2 - 4 us | 5 | |
4 - 8 us | 0 | |
8 - 16 us | 0 | |
16 - 32 us | 0 | |
32 - 64 us | 0 | |
64 - 128 us | 0 | |
128 - 256 us | 0 | |
256 - 512 us | 0 | |
512 - 1024 us | 0 | |
1 - ... ms | 0 | |
#
The new histogram mode:
# perf ftrace latency --bucket-range=150 --use-nsec --use-bpf \
-T switch_mm_irqs_off -a sleep 2
# DURATION | COUNT | GRAPH |
0 - 1 ns | 0 | |
1 - 151 ns | 265 | # |
151 - 301 ns | 1797 | ########### |
301 - 451 ns | 258 | # |
451 - 601 ns | 289 | # |
601 - 751 ns | 2049 | ############# |
751 - 901 ns | 967 | ###### |
901 - 1051 ns | 513 | ### |
1.05 - 1.20 us | 114 | |
1.20 - 1.35 us | 559 | ### |
1.35 - 1.50 us | 189 | # |
1.50 - 1.65 us | 137 | |
1.65 - 1.80 us | 32 | |
1.80 - 1.95 us | 2 | |
1.95 - 2.10 us | 0 | |
2.10 - 2.25 us | 1 | |
2.25 - 2.40 us | 1 | |
2.40 - 2.55 us | 0 | |
2.55 - 2.70 us | 0 | |
2.70 - 2.85 us | 0 | |
2.85 - 3.00 us | 1 | |
3.00 - ... us | 4 | |
#
Co-developed-by: Gabriele Monaco <gmonaco@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20241112181214.1171244-3-acme@kernel.org
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
#ifndef __PERF_FTRACE_H__
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#define __PERF_FTRACE_H__
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#include <linux/list.h>
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#include "target.h"
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struct evlist;
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struct hashamp;
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struct perf_ftrace {
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struct evlist *evlist;
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struct target target;
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const char *tracer;
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struct list_head filters;
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struct list_head notrace;
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struct list_head graph_funcs;
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struct list_head nograph_funcs;
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struct hashmap *profile_hash;
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unsigned long percpu_buffer_size;
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bool inherit;
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bool use_nsec;
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unsigned int bucket_range;
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int graph_depth;
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int func_stack_trace;
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int func_irq_info;
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int graph_nosleep_time;
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int graph_noirqs;
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int graph_verbose;
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int graph_thresh;
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int graph_tail;
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};
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struct filter_entry {
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struct list_head list;
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char name[];
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};
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#define NUM_BUCKET 22 /* 20 + 2 (for outliers in both direction) */
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#ifdef HAVE_BPF_SKEL
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int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace);
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int perf_ftrace__latency_start_bpf(struct perf_ftrace *ftrace);
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int perf_ftrace__latency_stop_bpf(struct perf_ftrace *ftrace);
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int perf_ftrace__latency_read_bpf(struct perf_ftrace *ftrace,
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int buckets[]);
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int perf_ftrace__latency_cleanup_bpf(struct perf_ftrace *ftrace);
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#else /* !HAVE_BPF_SKEL */
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static inline int
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perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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return -1;
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}
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static inline int
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perf_ftrace__latency_start_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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return -1;
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}
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static inline int
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perf_ftrace__latency_stop_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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return -1;
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}
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static inline int
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perf_ftrace__latency_read_bpf(struct perf_ftrace *ftrace __maybe_unused,
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int buckets[] __maybe_unused)
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{
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return -1;
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}
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static inline int
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perf_ftrace__latency_cleanup_bpf(struct perf_ftrace *ftrace __maybe_unused)
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{
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return -1;
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}
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#endif /* HAVE_BPF_SKEL */
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#endif /* __PERF_FTRACE_H__ */
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