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1c0bd0e891
linux_dsm_epyc7002/tools/perf/util
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Wang Nan 1c0bd0e891 perf probe: Try to use symbol table if searching debug info failed 
A problem can occur in a statically linked perf when vmlinux can be found:

 # perf probe --add sys_epoll_pwait
 probe-definition(0): sys_epoll_pwait
 symbol:sys_epoll_pwait file:(null) line:0 offset:0 return:0 lazy:(null)
 0 arguments
 Looking at the vmlinux_path (7 entries long)
 Using /lib/modules/4.2.0-rc1+/build/vmlinux for symbols
 Open Debuginfo file: /lib/modules/4.2.0-rc1+/build/vmlinux
 Try to find probe point from debuginfo.
 Symbol sys_epoll_pwait address found : ffffffff8122bd40
 Matched function: SyS_epoll_pwait
 Failed to get call frame on 0xffffffff8122bd40
 An error occurred in debuginfo analysis (-2).
   Error: Failed to add events. Reason: No such file or directory (Code: -2)

The reason is caused by libdw that, if libdw is statically linked, it
can't load libebl_{arch}.so reliable.

In this case it is still possible to get the address from
/proc/kalksyms.  However, perf tries that only when libdw returns
-EBADF.

This patch gives it another chance to utilize symbol table, even if
libdw returns an error code other than -EBADF.

After applying this patch:

 # perf probe -nv --add sys_epoll_pwait
 probe-definition(0): sys_epoll_pwait
 symbol:sys_epoll_pwait file:(null) line:0 offset:0 return:0 lazy:(null)
 0 arguments
 Looking at the vmlinux_path (7 entries long)
 Using /lib/modules/4.2.0-rc1+/build/vmlinux for symbols
 Open Debuginfo file: /lib/modules/4.2.0-rc1+/build/vmlinux
 Try to find probe point from debuginfo.
 Symbol sys_epoll_pwait address found : ffffffff8122bd40
 Matched function: SyS_epoll_pwait
 Failed to get call frame on 0xffffffff8122bd40
 An error occurred in debuginfo analysis (-2).
 Trying to use symbols.
 Opening /sys/kernel/debug/tracing/kprobe_events write=1
 Added new event:
 Writing event: p:probe/sys_epoll_pwait _text+2276672
   probe:sys_epoll_pwait (on sys_epoll_pwait)

 You can now use it in all perf tools, such as:

 	perf record -e probe:sys_epoll_pwait -aR sleep 1

Although libdw returns an error (Failed to get call frame), perf tries
symbol table and finally gets correct address.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1440151770-129878-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-08-21 12:57:20 -03:00
..
include tools: Copy rbtree_augmented.h from the kernel 2015-07-05 22:59:05 -03:00
intel-pt-decoder perf tools: Add Intel PT decoder 2015-08-17 11:11:36 -03:00
scripting-engines tracing: Rename FTRACE_MAX_EVENT to TRACE_EVENT_TYPE_MAX 2015-05-13 14:06:42 -04:00
abspath.c
alias.c
annotate.c perf tools: /proc/kcore requires CAP_SYS_RAWIO message too noisy 2015-08-21 10:29:23 -03:00
annotate.h perf annotate: Compute IPC and basic block cycles 2015-08-06 16:36:12 -03:00
auxtrace.c perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
auxtrace.h perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
bitmap.c
Build perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
build-id.c perf buildid: Use SBUILD_ID_SIZE macro 2015-07-20 17:49:50 -03:00
build-id.h perf buildid: Use SBUILD_ID_SIZE macro 2015-07-20 17:49:50 -03:00
cache.h perf report: Fix some option handling on --stdio 2015-05-14 10:05:22 -03:00
callchain.c perf callchain: Move option parsing code to util.c 2015-08-08 14:16:49 -03:00
callchain.h perf callchain: Move option parsing code to util.c 2015-08-08 14:16:49 -03:00
cgroup.c perf cgroup: Use atomic.h for refcounting 2015-05-15 16:12:20 -03:00
cgroup.h perf cgroup: Use atomic.h for refcounting 2015-05-15 16:12:20 -03:00
cloexec.c perf bench numa: Fix to show proper convergence stats 2015-06-25 12:28:35 -03:00
cloexec.h perf tools: Fix build errors with mipsel-linux-uclibc compiler 2015-08-05 16:56:16 -03:00
color.c perf tools: Do not include escape sequences in color_vfprintf return 2015-08-05 16:46:06 -03:00
color.h perf tools: Remove trail argument to color vsprintf 2015-08-05 16:44:02 -03:00
comm.c perf comm: Use atomic.h for refcounting 2015-05-27 12:21:43 -03:00
comm.h perf tools: Add facility to export data in database-friendly way 2014-10-29 10:32:49 -02:00
config.c perf tools: Introduce llvm config options 2015-08-07 10:16:59 -03:00
counts.c perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
counts.h perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
cpumap.c perf tools: Add reference counting for cpu_map object 2015-06-25 15:15:50 -03:00
cpumap.h perf tools: Add reference counting for cpu_map object 2015-06-25 15:15:50 -03:00
ctype.c
data-convert-bt.c perf data: Fix signedness of value 2015-04-29 10:37:49 -03:00
data-convert-bt.h perf data: Support using -f to override perf.data file ownership for 'convert' 2015-04-02 13:18:52 -03:00
data.c perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
data.h
db-export.c perf db-export: Fix thread ref-counting 2015-05-29 12:43:39 -03:00
db-export.h perf db-export: No need to have ->thread twice in struct export_sample 2015-04-02 13:18:43 -03:00
debug.c perf tools: Introduce veprintf 2015-08-06 15:30:38 -03:00
debug.h perf tools: Introduce veprintf 2015-08-06 15:30:38 -03:00
dso.c perf tools: Reference count struct dso 2015-06-08 10:31:40 -03:00
dso.h perf symbols: Add front end cache for DSO symbol lookup 2015-07-23 11:28:35 -03:00
dwarf-aux.c perf probe: Fix to add missed brace around if block 2015-08-13 14:51:26 -03:00
dwarf-aux.h perf probe: Ignore tail calls to probed functions 2015-05-14 10:05:09 -03:00
environment.c perf report: Fix some option handling on --stdio 2015-05-14 10:05:22 -03:00
event.c perf tools: Add new PERF_RECORD_SWITCH event 2015-07-23 22:51:13 -03:00
event.h perf tools: Add support for cycles, weight branch_info field 2015-08-06 16:29:45 -03:00
evlist.c perf script: Fix segfault using --show-mmap-events 2015-08-21 10:29:22 -03:00
evlist.h perf tools: Add a helper function to probe whether cpu-wide tracing is possible 2015-08-17 11:08:37 -03:00
evsel.c perf callchain: Allow disabling call graphs per event 2015-08-12 13:20:28 -03:00
evsel.h perf callchain: Per-event type selection support 2015-08-12 13:20:27 -03:00
exec_cmd.c
exec_cmd.h
find-vdso-map.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
generate-cmdlist.sh
header.c perf header: Use argv style storage for cmdline feature data 2015-07-21 14:34:08 -03:00
header.h perf header: Use argv style storage for cmdline feature data 2015-07-21 14:34:08 -03:00
help.c
help.h
hist.c perf report: Show call graph from reference events 2015-08-12 13:20:28 -03:00
hist.h perf report: Add support for srcfile sort key 2015-08-10 17:20:25 -03:00
intel-bts.c perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
intel-bts.h perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
intel-pt.c perf tools: Fix Intel PT timestamp handling 2015-08-21 10:29:23 -03:00
intel-pt.h perf tools: Add Intel PT support 2015-08-17 11:11:36 -03:00
intlist.c
intlist.h
kvm-stat.h perf kvm: Support using -f to override perf.data.guest file ownership 2015-04-02 13:18:47 -03:00
levenshtein.c
levenshtein.h
llvm-utils.c perf tests: Add LLVM test for eBPF on-the-fly compiling 2015-08-07 10:57:24 -03:00
llvm-utils.h perf tests: Add LLVM test for eBPF on-the-fly compiling 2015-08-07 10:57:24 -03:00
lzma.c perf tools: Add lzma decompression support for kernel module 2015-03-21 14:53:40 -03:00
machine.c Merge branch 'perf/urgent' into perf/core, to pick up fixes before adding more changes 2015-08-20 11:48:56 +02:00
machine.h perf tools: Add new PERF_RECORD_SWITCH event 2015-07-23 22:51:13 -03:00
map.c perf tools: Initialize reference counts in map__clone() 2015-08-21 12:39:30 -03:00
map.h perf symbols: Introduce map__is_(kernel,kmodule)() 2015-07-23 11:28:36 -03:00
ordered-events.c perf ordered_samples: Remove references to perf_{evlist,tool} and machines 2015-03-31 17:52:32 -03:00
ordered-events.h perf ordered_samples: Remove references to perf_{evlist,tool} and machines 2015-03-31 17:52:32 -03:00
pager.c perf report: Fix some option handling on --stdio 2015-05-14 10:05:22 -03:00
parse-branch-options.c perf record: Add support for sampling indirect jumps 2015-06-07 16:08:31 +02:00
parse-branch-options.h perf tools: Move branch option parsing to own file 2015-05-27 21:02:17 -03:00
parse-events.c perf callchain: Per-event type selection support 2015-08-12 13:20:27 -03:00
parse-events.h perf callchain: Per-event type selection support 2015-08-12 13:20:27 -03:00
parse-events.l perf callchain: Per-event type selection support 2015-08-12 13:20:27 -03:00
parse-events.y perf tools: Fix parse_events_error dereferences 2015-05-27 12:21:43 -03:00
parse-options.c perf report: Don't allow empty argument for '-t'. 2015-03-19 13:53:28 -03:00
parse-options.h perf record: Add AUX area tracing Snapshot Mode support 2015-05-05 18:13:01 -03:00
path.c
perf_regs.c perf tools: Cache register accesses for unwind processing 2014-06-12 16:53:19 +02:00
perf_regs.h perf tools: Cache register accesses for unwind processing 2014-06-12 16:53:19 +02:00
PERF-VERSION-GEN
pmu.c perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
pmu.h perf tools: Add perf_pmu__format_bits() 2015-08-06 16:49:01 -03:00
pmu.l
pmu.y
probe-event.c perf probe: Try to use symbol table if searching debug info failed 2015-08-21 12:57:20 -03:00
probe-event.h perf tools: Add missing forward declaration of struct map to probe-event.h 2015-08-06 15:38:40 -03:00
probe-file.c perf probe: Move ftrace probe-event operations to probe-file.c 2015-07-20 17:49:49 -03:00
probe-file.h perf probe: Move ftrace probe-event operations to probe-file.c 2015-07-20 17:49:49 -03:00
probe-finder.c perf strlist: Make dupstr be the default and part of an extensible config parm 2015-07-20 12:13:34 -03:00
probe-finder.h perf probe: Introduce probe_conf global configs 2015-05-08 16:26:26 -03:00
pstack.c perf tools: Introduce pstack_peek() 2015-05-05 18:13:22 -03:00
pstack.h perf tools: Introduce pstack_peek() 2015-05-05 18:13:22 -03:00
python-ext-sources perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
python.c perf python: Add missing PERF_RECORD_{MMAP2,AUX,etc} 2015-07-29 10:51:45 -03:00
quote.c
quote.h
rblist.c
rblist.h
record.c perf tools: Add a helper function to probe whether cpu-wide tracing is possible 2015-08-17 11:08:37 -03:00
run-command.c perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
run-command.h
session.c perf tools: Add support for cycles, weight branch_info field 2015-08-06 16:29:45 -03:00
session.h perf tools: Add AUX area tracing index 2015-05-04 19:48:47 -03:00
setup.py tools lib api: Rename libapikfs.a to libapi.a 2015-02-12 17:55:18 -03:00
sigchain.c
sigchain.h
sort.c perf sort: Check for SRCLINE_UNKNOWN case in "srcfile" processing 2015-08-12 10:27:02 -03:00
sort.h perf report: Add support for srcfile sort key 2015-08-10 17:20:25 -03:00
srcline.c perf tools: Support full source file paths for srcline 2015-08-10 11:58:05 -03:00
stat-shadow.c perf stat: Fix transaction lenght metrics 2015-07-28 12:05:04 -03:00
stat.c perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
stat.h perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
strbuf.c
strbuf.h
strfilter.c perf tools: Add strfilter__string to recover rules string 2015-05-04 12:43:54 -03:00
strfilter.h perf tools: Add strfilter__string to recover rules string 2015-05-04 12:43:54 -03:00
string.c perf tools: Asprintf like functions to format integer filter expression 2015-07-06 10:21:46 -03:00
strlist.c perf strlist: Make parse_list() private 2015-07-20 14:51:07 -03:00
strlist.h perf strlist: Make parse_list() private 2015-07-20 14:51:07 -03:00
svghelper.c perf tools: Add reference counting for cpu_map object 2015-06-25 15:15:50 -03:00
svghelper.h perf timechart: Implement IO mode 2014-07-10 00:22:54 +02:00
symbol-elf.c perf symbols: Fix annotation of vdso 2015-08-17 11:07:38 -03:00
symbol-minimal.c perf symbols: Save DSO loading errno to better report errors 2015-03-24 12:08:43 -03:00
symbol.c perf tools: /proc/kcore requires CAP_SYS_RAWIO message too noisy 2015-08-21 10:29:23 -03:00
symbol.h perf report: Show call graph from reference events 2015-08-12 13:20:28 -03:00
target.c perf target: Simplify handling of strerror_r return 2015-03-24 12:08:30 -03:00
target.h
thread_map.c perf/core improvements and fixes: 2015-07-21 07:58:06 +02:00
thread_map.h perf thrad_map: Add comm string into array 2015-06-26 11:07:01 -03:00
thread-stack.c perf tools: Ensure thread-stack is flushed 2015-06-19 16:03:33 -03:00
thread-stack.h perf tools: Ensure thread-stack is flushed 2015-06-19 16:03:33 -03:00
thread.c perf tools: Avoid deadlock when map_groups are broken 2015-08-19 14:15:09 -03:00
thread.h perf tools: Elliminate alignment holes 2015-05-18 10:17:33 -03:00
tool.h perf tools: Add new PERF_RECORD_SWITCH event 2015-07-23 22:51:13 -03:00
top.c
top.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
trace-event-info.c perf tools: Stop copying kallsyms into the perf.data file header 2015-07-23 22:51:12 -03:00
trace-event-parse.c perf tools: Stop reading the kallsyms data from perf.data 2015-07-23 22:51:11 -03:00
trace-event-read.c perf tools: Stop reading the kallsyms data from perf.data 2015-07-23 22:51:11 -03:00
trace-event-scripting.c perf scripting: No need to pass thread twice to the scripting callbacks 2015-04-02 13:18:41 -03:00
trace-event.c perf python: Remove dependency on 'machine' methods 2015-07-29 10:51:44 -03:00
trace-event.h perf python: Remove dependency on 'machine' methods 2015-07-29 10:51:44 -03:00
tsc.c perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
tsc.h perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
unwind-libdw.c perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
unwind-libdw.h perf tools: Add libdw DWARF post unwind support 2014-02-24 09:29:36 -03:00
unwind-libunwind.c perf unwind: Fix a compile error 2015-06-16 10:40:03 -03:00
unwind.h perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
usage.c
util.c perf callchain: Move option parsing code to util.c 2015-08-08 14:16:49 -03:00
util.h perf tools: Support full source file paths for srcline 2015-08-10 11:58:05 -03:00
values.c
values.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
vdso.c perf tools: Fix lockup using 32-bit compat vdso 2015-07-07 11:05:08 -03:00
vdso.h perf machine: Fix up vdso methods names 2015-05-29 12:43:44 -03:00
wrapper.c
xyarray.c perf tools: Introduce xyarray__reset function 2015-06-16 10:34:39 -03:00
xyarray.h perf tools: Introduce xyarray__reset function 2015-06-16 10:34:39 -03:00
zlib.c perf tools: Add gzip decompression support for kernel module 2014-11-05 10:11:26 -03:00