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Date: Thu, 11 Aug 2011 21:05:55 +0900
From: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To: Arnaldo Carvalho de Melo <acme@...radead.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
David Ahern <dsahern@...il.com>
Cc: linux-kernel@...r.kernel.org,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
yrl.pp-manager.tt@...achi.com
Subject: [PATCH -tip v3 0/5] perf script: add BTS analysis features
Hi Frederic, David,
This patch series adds the functions to analyze BTS logs to perf-script and,
makes perf-script more informative version 3.
The patches add the following functions.
- Unify the expression to "[unknown]"
- Fix BTS record header to resolve DSOs and symbols of user-space
- Resolve DSOs and symbols for BTS's branch_from addresses
- Show the offset of symbols with the 'offs' field specifier.
- Resolve the real path of [kernel.kallsym] using
'--show-kernel-path' option.
Usage:
First, get the BTS log with the following command.
# perf record -e branches:u -c 1 -d <command>
Second, analyze that trace data.
# perf script -f ip,addr,sym,offs,dso [--show-kernel-path]
This command's output format is:
<branch_to addr> <branch_to function+offset> <branch_to DSO> <branch_from addr> <branch_from function+offset> <branch_from DSO>
Output sample:
# perf record -e branches:u -c 1 -d ls
[snip]
# perf script -f ip,addr,sym,dso,offs --show-kernel-path
34308016b0 _start+0x0 (/lib64/ld-2.14.so) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
34308016b0 _start+0x0 (/lib64/ld-2.14.so) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
3430804b80 _dl_start+0x0 (/lib64/ld-2.14.so) 34308016b3 _start+0x3 (/lib64/ld-2.14.so)
3430804b80 _dl_start+0x0 (/lib64/ld-2.14.so) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
3430804ba6 _dl_start+0x26 (/lib64/ld-2.14.so) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
3430804bad _dl_start+0x2d (/lib64/ld-2.14.so) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
3430804c1d _dl_start+0x9d (/lib64/ld-2.14.so) 3430804bfb _dl_start+0x7b (/lib64/ld-2.14.so)
3430804c00 _dl_start+0x80 (/lib64/ld-2.14.so) 3430804c21 _dl_start+0xa1 (/lib64/ld-2.14.so)
[snip]
401fd0 main+0x0 (/root/bin/ls) 3430c21399 __libc_start_main+0xe9 (/lib64/libc-2.14.so)
409ad0 set_program_name+0x0 (/root/bin/ls) 401ff3 main+0x23 (/root/bin/ls)
409ad0 set_program_name+0x0 (/root/bin/ls) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
401ca8 strrchr@...+0x0 (/root/bin/ls) 409ade set_program_name+0xe (/root/bin/ls)
401cae strrchr@...+0x6 (/root/bin/ls) 401ca8 strrchr@...+0x0 (/root/bin/ls)
401a38 _init+0x18 (/root/bin/ls) 401cb3 strrchr@...+0xb (/root/bin/ls)
3430813850 _dl_runtime_resolve+0x0 (/lib64/ld-2.14.so) 401a3e _init+0x1e (/root/bin/ls)
[snip]
It shows the tracee application's execution path.
TODO:
- add source code path field, line number field ...etc.
- add record/report script to use easily and, show human-friendly output.
- filtering kernel functions using scripts
Changes in v3:
- remove the bug fix patch already fixed.
- unify the "[unknown]" expressions in perf-script.
- fix perf_event_header of BTS events.
- fix patch's descriptions
Changes in v2:
- add a bug fix patch that prints correct IP address
- output the magic word "(unknown)" as symbol name when perf-script can't
resolve symbols.
- output "[unknown]" as DSO name when perf-script can't resolve DSO path.
- change the way to output offset of symbols from '--show-symbol-offset' to
'offs' field.
- clean up codes.
Thanks,
---
Akihiro Nagai (5):
perf script: add option resolving vmlinux path
perf script: add the offset field specifier
perf script: enhance IP and ADDR correlate detection for BTS
perf: change perf_event_header.misc to PERF_RECORD_MISC_USER for BTS
perf-script: unify the expressions indicate "unknown"
arch/x86/kernel/cpu/perf_event_intel_ds.c | 8 +++++
tools/perf/Documentation/perf-script.txt | 5 +++
tools/perf/builtin-script.c | 44 +++++++++++++++++++----------
tools/perf/util/map.c | 15 ++++++++++
tools/perf/util/map.h | 1 +
tools/perf/util/session.c | 38 +++++++++----------------
tools/perf/util/session.h | 3 +-
tools/perf/util/symbol.c | 20 +++++++++++++
tools/perf/util/symbol.h | 4 +++
9 files changed, 96 insertions(+), 42 deletions(-)
--
Akihiro Nagai (akihiro.nagai.hw@...achi.com)
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