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Groups > linux.kernel > #1291382
| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 16/16] perf record: Support custom vmlinux path |
| Date | 2015-12-14 18:50 +0100 |
| Message-ID | <qFFq3-Q8-31@gated-at.bofh.it> (permalink) |
| References | <qFFq2-Q8-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: He Kuang <hekuang@huawei.com>
Make perf-record command support --vmlinux option if BPF_PROLOGUE is on.
'perf record' needs vmlinux as the source of DWARF info to generate
prologue for BPF programs, so path of vmlinux should be specified.
Short name 'k' has been taken by 'clockid'. This patch skips the short
option name and uses '--vmlinux' for vmlinux path.
Documentation is also updated.
Test result:
In a production (or broken) environment:
(by:
# rm -rf ~/.debug/
# mv /lib/modules/`uname -r`/build/vmlinux /tmp/
)
# ./perf record -e ./test_bpf_base.c ls
Failed to find the path for kernel: No such file or directory
event syntax error: './test_bpf_base.c'
\___ You need to check probing points in BPF file
...
# ./perf record --vmlinux /tmp/vmlinux -e ./test_bpf_base.c ls
...
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.011 MB perf.data ]
Help messages when build with NO_LIBBPF:
# ./perf record -h
--transaction sample transaction flags (special events only)
--vmlinux <file> vmlinux pathname
(not built-in because NO_LIBBPF=1)
# ./perf record --vmlinux /tmp/vmlinux ls /
Warning: option `vmlinux' is being ignored because NO_LIBBPF=1
...
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.011 MB perf.data (11 samples) ]
Help messages when build with NO_DWARF:
# ./perf record -h
--transaction sample transaction flags (special events only)
--vmlinux <file> vmlinux pathname
(not built-in because NO_DWARF=1)
Signed-off-by: He Kuang <hekuang@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1450089563-122430-15-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-record.txt | 10 ++++++++--
tools/perf/builtin-record.c | 16 ++++++++++++++++
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index e630a7d2c348..8d032f4e50bf 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -314,11 +314,17 @@ This option sets the time out limit. The default value is 500 ms.
Record context switch events i.e. events of type PERF_RECORD_SWITCH or
PERF_RECORD_SWITCH_CPU_WIDE.
---clang-path::
+--clang-path=PATH::
Path to clang binary to use for compiling BPF scriptlets.
+(enabled when BPF support is on)
---clang-opt::
+--clang-opt=OPTIONS::
Options passed to clang when compiling BPF scriptlets.
+(enabled when BPF support is on)
+
+--vmlinux=PATH::
+Specify vmlinux path which has debuginfo.
+(enabled when BPF prologue is on)
SEE ALSO
--------
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index c2ba377e8d3a..3ef3c79e7534 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1117,6 +1117,8 @@ struct option __record_options[] = {
"clang binary to use for compiling BPF scriptlets"),
OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
"options passed to clang when compiling BPF scriptlets"),
+ OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
OPT_END()
};
@@ -1135,6 +1137,20 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
# undef set_nobuild
#endif
+#ifndef HAVE_BPF_PROLOGUE
+# if !defined (HAVE_DWARF_SUPPORT)
+# define REASON "NO_DWARF=1"
+# elif !defined (HAVE_LIBBPF_SUPPORT)
+# define REASON "NO_LIBBPF=1"
+# else
+# define REASON "this architecture doesn't support BPF prologue"
+# endif
+# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
+ set_nobuild('\0', "vmlinux", true);
+# undef set_nobuild
+# undef REASON
+#endif
+
rec->evlist = perf_evlist__new();
if (rec->evlist == NULL)
return -ENOMEM;
--
2.1.0
--
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[GIT PULL 00/16] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 16/16] perf record: Support custom vmlinux path Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 09/16] perf build: Fix 'make clean' Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 06/16] perf build: Remove unnecessary line in Makefile.feature Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 01/16] perf tools: Use same signal handling strategy as 'record' Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 12/16] perf tools: Remove check for unused PERF_PAGER_IN_USE Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 15/16] perf tools: Make options always available, even if required libs not linked Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 05/16] perf test: Fix hist testcases when kptr_restrict is on Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
Re: [PATCH 05/16] perf test: Fix hist testcases when kptr_restrict is on "Wangnan (F)" <wangnan0@huawei.com> - 2015-12-15 05:10 +0100
[PATCH 03/16] perf thread: Fix reference count initial state Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 14/16] perf tools: Convert parse-options.c internal functions to static Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
[PATCH 04/16] perf evsel: Disable branch flags/cycles for --callgraph lbr Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 18:50 +0100
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