Re: [PATCH v4 5/7] perf report: Sort by sampled cycles percent per block for stdio
From: Jiri Olsa
Date: Tue Oct 29 2019 - 05:27:40 EST
On Mon, Oct 28, 2019 at 09:33:28AM +0800, Jin Yao wrote:
> It would be useful to support sorting for all blocks by the
> sampled cycles percent per block. This is useful to concentrate
> on the globally hottest blocks.
>
> This patch implements a new option "--total-cycles" which sorts
> all blocks by 'Sampled Cycles%'. The 'Sampled Cycles%' is the
> percent:
>
> percent = block sampled cycles aggregation / total sampled cycles
>
> Note that, this patch only supports "--stdio" mode.
>
> For example,
>
> perf record -b ./div
> perf report --total-cycles --stdio
>
> # To display the perf.data header info, please use --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 2M of event 'cycles'
> # Event count (approx.): 2753248
> #
> # Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range] Shared Object
> # ............... .............. ........... .......... ................................................................. ....................
> #
> 26.04% 2.8M 0.40% 18 [div.c:42 -> div.c:39] div
> 15.17% 1.2M 0.16% 7 [random_r.c:357 -> random_r.c:380] libc-2.27.so
> 5.11% 402.0K 0.04% 2 [div.c:27 -> div.c:28] div
> 4.87% 381.6K 0.04% 2 [random.c:288 -> random.c:291] libc-2.27.so
> 4.53% 381.0K 0.04% 2 [div.c:40 -> div.c:40] div
> 3.85% 300.9K 0.02% 1 [div.c:22 -> div.c:25] div
> 3.08% 241.1K 0.02% 1 [rand.c:26 -> rand.c:27] libc-2.27.so
> 3.06% 240.0K 0.02% 1 [random.c:291 -> random.c:291] libc-2.27.so
> 2.78% 215.7K 0.02% 1 [random.c:298 -> random.c:298] libc-2.27.so
> 2.52% 198.3K 0.02% 1 [random.c:293 -> random.c:293] libc-2.27.so
> 2.36% 184.8K 0.02% 1 [rand.c:28 -> rand.c:28] libc-2.27.so
> 2.33% 180.5K 0.02% 1 [random.c:295 -> random.c:295] libc-2.27.so
> 2.28% 176.7K 0.02% 1 [random.c:295 -> random.c:295] libc-2.27.so
> 2.20% 168.8K 0.02% 1 [rand@plt+0 -> rand@plt+0] div
> 1.98% 158.2K 0.02% 1 [random_r.c:388 -> random_r.c:388] libc-2.27.so
> 1.57% 123.3K 0.02% 1 [div.c:42 -> div.c:44] div
> 1.44% 116.0K 0.42% 19 [random_r.c:357 -> random_r.c:394] libc-2.27.so
> 0.25% 182.5K 0.02% 1 [random_r.c:388 -> random_r.c:391] libc-2.27.so
> 0.00% 48 1.07% 48 [x86_pmu_enable+284 -> x86_pmu_enable+298] [kernel.kallsyms]
> 0.00% 74 1.64% 74 [vm_mmap_pgoff+0 -> vm_mmap_pgoff+92] [kernel.kallsyms]
> 0.00% 73 1.62% 73 [vm_mmap+0 -> vm_mmap+48] [kernel.kallsyms]
> 0.00% 63 0.69% 31 [up_write+0 -> up_write+34] [kernel.kallsyms]
> 0.00% 13 0.29% 13 [setup_arg_pages+396 -> setup_arg_pages+413] [kernel.kallsyms]
> 0.00% 3 0.07% 3 [setup_arg_pages+418 -> setup_arg_pages+450] [kernel.kallsyms]
> 0.00% 616 6.84% 308 [security_mmap_file+0 -> security_mmap_file+72] [kernel.kallsyms]
> 0.00% 23 0.51% 23 [security_mmap_file+77 -> security_mmap_file+87] [kernel.kallsyms]
> 0.00% 4 0.02% 1 [sched_clock+0 -> sched_clock+4] [kernel.kallsyms]
> 0.00% 4 0.02% 1 [sched_clock+9 -> sched_clock+12] [kernel.kallsyms]
> 0.00% 1 0.02% 1 [rcu_nmi_exit+0 -> rcu_nmi_exit+9] [kernel.kallsyms]
>
> v4:
> ---
> 1. Use new option '--total-cycles' to replace
> '-s total_cycles' in v3.
>
> 2. Move block info collection out of block info
> printing.
>
> v3:
> ---
> 1. Use common function block_info__process_sym to
> process the blocks per symbol.
>
> 2. Remove the nasty hack for skipping calculation
> of column length
>
> 3. Some minor cleanup
>
> Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
> ---
> tools/perf/Documentation/perf-report.txt | 11 ++
> tools/perf/builtin-report.c | 125 ++++++++++++++++++++++-
> tools/perf/ui/stdio/hist.c | 22 ++++
> tools/perf/util/hist.c | 4 +
> tools/perf/util/symbol_conf.h | 1 +
> 5 files changed, 160 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
> index 7315f155803f..8dbe2119686a 100644
> --- a/tools/perf/Documentation/perf-report.txt
> +++ b/tools/perf/Documentation/perf-report.txt
> @@ -525,6 +525,17 @@ include::itrace.txt[]
> Configure time quantum for time sort key. Default 100ms.
> Accepts s, us, ms, ns units.
>
> +--total-cycles::
> + When --total-cycles is specified, it supports sorting for all blocks by
> + 'Sampled Cycles%'. This is useful to concentrate on the globally hottest
> + blocks. In output, there are some new columns:
> +
> + 'Sampled Cycles%' - block sampled cycles aggregation / total sampled cycles
> + 'Sampled Cycles' - block sampled cycles aggregation
> + 'Avg Cycles%' - block average sampled cycles / sum of total block average
> + sampled cycles
> + 'Avg Cycles' - block average sampled cycles
> +
> include::callchain-overhead-calculation.txt[]
>
> SEE ALSO
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index cdb436d6e11f..a687d9e4aeca 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -51,6 +51,7 @@
> #include "util/util.h" // perf_tip()
> #include "ui/ui.h"
> #include "ui/progress.h"
> +#include "util/block-info.h"
>
> #include <dlfcn.h>
> #include <errno.h>
> @@ -67,6 +68,12 @@
> #include <unistd.h>
> #include <linux/mman.h>
>
> +struct block_report {
> + struct block_hist block_hist;
> + u64 block_cycles;
> + struct block_fmt block_fmts[PERF_HPP_REPORT__BLOCK_MAX_INDEX];
no need for the 'block_' prefix for the members
also please put this and all the new functions under block_info.c
thanks,
jirka