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Date: Thu, 12 Nov 2015 09:50:21 -0800
From: Brendan Gregg <brendan.d.gregg@...il.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jiri Olsa <jolsa@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Kan Liang <kan.liang@...el.com>
Subject: Re: [PATCHSET 0/9] perf report: Support folded callchain output (v5)
On Sun, Nov 8, 2015 at 9:45 PM, Namhyung Kim <namhyung@...nel.org> wrote:
> Hello,
>
> This is what Brendan requested on the perf-users mailing list [1] to
> support FlameGraphs [2] more efficiently. This patchset adds a few
> more callchain options to adjust the output for it.
>
> * changes in v5)
> - honor field separator from -t option
> - add support for TUI and GTK
>
> * changes in v4)
> - add missing doc update
> - cleanup/fix callchain value print code
> - add Acked-by from Brendan and Jiri
>
> * changes in v3)
> - put the value before callchains
> - fix compile error
>
>
> At first, 'folded' output mode was added. The folded output puts the
> value, a space and all calchain nodes separated by semicolons. Now it
> only supports --stdio as other UI provides some way of folding and/or
> expanding callchains dynamically.
>
> The value is now can be one of 'percent', 'period', or 'count'. The
> percent is current default output and the period is the raw number of
> sample periods. The count is the number of samples for each callchain.
>
> The proposed features of hiding hist lines with '-F none' and showing
> hist info with callchains can be added as later work.
>
> Here's an example:
>
> $ perf report --no-children --show-nr-samples --stdio -g folded,count
> ...
> 39.93% 80 swapper [kernel.vmlinux] [k] intel_idel
> 57 intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
> 23 intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;...
>
Thanks, I tested it, it works!
It lets me do this:
# ./perf report --no-children -n --stdio -g folded,count -F pid
[...]
0:swapper
1032 xen_hypercall_sched_op;default_idle;arch_cpu_idle;default_idle_call;cpu_startup_entry;cpu_bringup_and_idle
134 xen_hypercall_sched_op;default_idle;arch_cpu_idle;default_idle_call;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;xen_start_kernel
1 xen_hypercall_xen_version;check_events;__schedule;schedule;schedule_preempt_disabled;cpu_startup_entry;cpu_bringup_and_idle
1 xen_hypercall_xen_version;check_events;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;xen_start_kernel
1248:bash
43 copy_page_range;copy_process;_do_fork;sys_clone;entry_SYSCALL_64_fastpath;__libc_fork;make_child
6 xen_hypercall_xen_version;check_events;xen_dup_mmap;copy_process;_do_fork;sys_clone;entry_SYSCALL_64_fastpath;__libc_fork;make_child
4 xen_hypercall_xen_version;check_events;copy_page_range;copy_process;_do_fork;sys_clone;entry_SYSCALL_64_fastpath;__libc_fork;make_child
[...]
This is a parsable call chain summary, and which can be flamegraph'd
after a touch of awk. Later on we can add a "-F none" and "-g pid"
etc, but this patch solves the number one issue of avoiding the
expense of needing to re-aggregate the call chain output (output of
perf script), so I'd be pretty happy to use this instead.
Brendan
>
> $ perf report --no-children --stdio -g percent
> ...
> 39.93% swapper [kernel.vmlinux] [k] intel_idel
> |
> ---intel_idle
> cpuidle_enter_state
> cpuidle_enter
> call_cpuidle
> cpu_startup_entry
> |
> |--28.63%-- start_secondary
> |
> --11.30%-- rest_init
>
>
> $ perf report --no-children --stdio --show-total-period -g period
> ...
> 39.93% 13018705 swapper [kernel.vmlinux] [k] intel_idel
> |
> ---intel_idle
> cpuidle_enter_state
> cpuidle_enter
> call_cpuidle
> cpu_startup_entry
> |
> |--9334403-- start_secondary
> |
> --3684302-- rest_init
>
>
> $ perf report --no-children --stdio --show-nr-samples -g count
> ...
> 39.93% 80 swapper [kernel.vmlinux] [k] intel_idel
> |
> ---intel_idle
> cpuidle_enter_state
> cpuidle_enter
> call_cpuidle
> cpu_startup_entry
> |
> |--57-- start_secondary
> |
> --23-- rest_init
>
>
> You can get it from 'perf/callchain-fold-v5' branch on my tree:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>
> Any comments are welcome, thanks
> Namhyung
>
>
> [1] http://www.spinics.net/lists/linux-perf-users/msg02498.html
> [2] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
>
>
> Namhyung Kim (9):
> perf report: Support folded callchain mode on --stdio
> perf callchain: Abstract callchain print function
> perf callchain: Add count fields to struct callchain_node
> perf report: Add callchain value option
> perf hists browser: Factor out hist_browser__show_callchain_list()
> perf hists browser: Support flat callchains
> perf hists browser: Support folded callchains
> perf ui/gtk: Support flat callchains
> perf ui/gtk: Support folded callchains
>
> tools/perf/Documentation/perf-report.txt | 14 +-
> tools/perf/builtin-report.c | 4 +-
> tools/perf/ui/browsers/hists.c | 316 ++++++++++++++++++++++++++++---
> tools/perf/ui/gtk/hists.c | 148 ++++++++++++++-
> tools/perf/ui/stdio/hist.c | 94 +++++++--
> tools/perf/util/callchain.c | 135 ++++++++++++-
> tools/perf/util/callchain.h | 28 ++-
> tools/perf/util/util.c | 3 +-
> 8 files changed, 679 insertions(+), 63 deletions(-)
>
> --
> 2.6.2
>
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