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Date: Tue, 23 Nov 2010 19:51:44 GMT
From: tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To: linux-tip-commits@...r.kernel.org
Cc: eranian@...gle.com, acme@...hat.com, mingo@...hat.com,
peterz@...radead.org, efault@....de, fweisbec@...il.com,
jj@...osbits.net, tglx@...utronix.de, hpa@...or.com,
paulus@...ba.org, linux-kernel@...r.kernel.org, tzanussi@...il.com,
sarah.a.sharp@...ux.intel.com, eugeneteo@...nel.org, tj@...nel.org,
meissner@...e.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf record: Handle restrictive permissions in /proc/{kallsyms,modules}
Commit-ID: c1a3a4b90a5a47adcca0e587f5d7e9ea61329b26
Gitweb: http://git.kernel.org/tip/c1a3a4b90a5a47adcca0e587f5d7e9ea61329b26
Author: Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 22 Nov 2010 14:01:55 -0200
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 22 Nov 2010 14:01:55 -0200
perf record: Handle restrictive permissions in /proc/{kallsyms,modules}
The 59365d1 commit, even being reverted by 33e0d57, showed a non robust
behavior in 'perf record': it really should just warn the user that some
functionality will not be available.
The new behavior then becomes:
[acme@...icio linux]$ ls -la /proc/{kallsyms,modules}
-r-------- 1 root root 0 Nov 22 12:19 /proc/kallsyms
-r-------- 1 root root 0 Nov 22 12:19 /proc/modules
[acme@...icio linux]$ perf record ls -R > /dev/null
Couldn't record kernel reference relocation symbol
Symbol resolution may be skewed if relocation was used (e.g. kexec).
Check /proc/kallsyms permission or run as root.
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.004 MB perf.data (~161 samples) ]
[acme@...icio linux]$ perf report --stdio
[kernel.kallsyms] with build id 77b05e00e64e4de1c9347d83879779b540d69f00 not found, continuing without symbols
# Events: 98 cycles
#
# Overhead Command Shared Object Symbol
# ........ ....... ............... ....................
#
48.26% ls [kernel] [k] ffffffff8102b92b
22.49% ls libc-2.12.90.so [.] __strlen_sse2
8.35% ls libc-2.12.90.so [.] __GI___strcoll_l
8.17% ls ls [.] 11580
3.35% ls libc-2.12.90.so [.] _IO_new_file_xsputn
3.33% ls libc-2.12.90.so [.] _int_malloc
1.88% ls libc-2.12.90.so [.] _int_free
0.84% ls libc-2.12.90.so [.] malloc_consolidate
0.84% ls libc-2.12.90.so [.] __readdir64
0.83% ls ls [.] strlen@plt
0.83% ls libc-2.12.90.so [.] __GI_fwrite_unlocked
0.83% ls libc-2.12.90.so [.] __memcpy_sse2
#
# (For a higher level overview, try: perf report --sort comm,dso)
#
[acme@...icio linux]$
It still has the build-ids for DSOs in the maps with hits:
[acme@...icio linux]$ perf buildid-list
77b05e00e64e4de1c9347d83879779b540d69f00 [kernel.kallsyms]
09c4a431a4a8b648fcfc2c2bdda70f56050ddff1 /bin/ls
af75ea9ad951d25e0f038901a11b3846dccb29a4 /lib64/libc-2.12.90.so
[acme@...icio linux]$
That can be used in another machine to resolve kernel symbols.
Cc: Eugene Teo <eugeneteo@...nel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Jesper Juhl <jj@...osbits.net>
Cc: Marcus Meissner <meissner@...e.de>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Tom Zanussi <tzanussi@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/builtin-record.c | 17 +++++++++--------
1 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 93bd2ff..e2c2de2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -697,17 +697,18 @@ static int __cmd_record(int argc, const char **argv)
if (err < 0)
err = event__synthesize_kernel_mmap(process_synthesized_event,
session, machine, "_stext");
- if (err < 0) {
- pr_err("Couldn't record kernel reference relocation symbol.\n");
- return err;
- }
+ if (err < 0)
+ pr_err("Couldn't record kernel reference relocation symbol\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/kallsyms permission or run as root.\n");
err = event__synthesize_modules(process_synthesized_event,
session, machine);
- if (err < 0) {
- pr_err("Couldn't record kernel reference relocation symbol.\n");
- return err;
- }
+ if (err < 0)
+ pr_err("Couldn't record kernel module information.\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/modules permission or run as root.\n");
+
if (perf_guest)
perf_session__process_machines(session, event__synthesize_guest_os);
--
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