linux/tools/perf
Arnaldo Carvalho de Melo f1dfa0b1c1 perf symbols: Add support for 'variable' symtabs
Example:

{
	u64 addr = strtoull(sym_filter, NULL, 16);
	struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr);

	if (map == NULL)
		pr_err("couldn't find map!\n");
	else {
		struct symbol *sym = map__find_symbol(map, addr, NULL);
		if (sym == NULL)
			pr_err("couldn't find addr!\n");
		else
			pr_info("addr %#Lx is in %s global var\n", addr, sym->name);
	}
	exit(0);
}

Added just after symbol__init() call in 'perf top', then:

{
        u64 addr = strtoull(sym_filter, NULL, 16);
        struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr);

        if (map == NULL)
                pr_err("couldn't find map!\n");
        else {
                struct symbol *sym = map__find_symbol(map, addr, NULL);
                if (sym == NULL)
                        pr_err("couldn't find addr!\n");
                else
                        pr_info("addr %#Lx is in %s global var\n", addr, sym->name);
        }
        exit(0);
}

[root@doppio linux-2.6-tip]# grep ' [dD] ' /proc/kallsyms | grep ' sched'
ffffffff817827d8 d sched_nr_latency
ffffffff81782ce0 d sched_domains_mutex
ffffffff8178c070 d schedstr.22423
ffffffff817909a0 d sched_register_mutex
ffffffff81823490 d sched_feat_names
ffffffff81823558 d scheduler_running
ffffffff818235b8 d sched_clock_running
ffffffff818235bc D sched_clock_stable
ffffffff81824f00 d sched_switch_trace
[root@doppio linux-2.6-tip]# perf top -s 0xffffffff817827d9
addr 0xffffffff817827d9 is in sched_nr_latency global var
[root@doppio linux-2.6-tip]# perf top -s ffffffff81782ce0
addr 0xffffffff81782ce0 is in sched_domains_mutex global var
[root@doppio linux-2.6-tip]#
[root@doppio linux-2.6-tip]# perf top -s ffffffff81782ce0 --vmlinux OFF
The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff81782ce0 is in sched_domains_mutex global var
[root@doppio linux-2.6-tip]# perf top -s ffffffff818235bc --vmlinux OFF
The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff818235bc is in sched_clock_stable global var
[root@doppio linux-2.6-tip]#

So it works with both /proc/kallsyms and with ELF symtabs, either
the one on the vmlinux explicitely passed via --vmlinux or in one
in the vmlinux_path that matches the buildid for the running kernel
or the one found in the buildid header section in a perf.data file.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260550239-5372-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-12 07:42:10 +01:00
..
bench perf tools: Introduce zalloc() for the common calloc(1, N) case 2009-11-24 16:37:02 +01:00
Documentation perf kmem: Show usage if no option is specified 2009-12-10 08:30:27 +01:00
scripts/perl perf trace/scripting: Add Fedora libperl install note to doc 2009-11-30 09:04:01 +01:00
util perf symbols: Add support for 'variable' symtabs 2009-12-12 07:42:10 +01:00
.gitignore perf tools: Add perf.data to .gitignore 2009-11-24 16:37:01 +01:00
builtin-annotate.c perf annotate: Fix perf data parsing 2009-12-01 08:14:08 +01:00
builtin-bench.c perf bench: Add memcpy() benchmark 2009-11-19 06:21:48 +01:00
builtin-buildid-list.c perf buildid-list: Fix copy'n'paste help message 2009-12-06 21:07:08 +01:00
builtin-help.c perf tools: Introduce zalloc() for the common calloc(1, N) case 2009-11-24 16:37:02 +01:00
builtin-kmem.c perf symbols: Rename kthreads to kmaps, using another abstraction for it 2009-12-12 07:42:09 +01:00
builtin-list.c perf list: Fix large list output by using the pager 2009-08-13 09:05:48 +02:00
builtin-probe.c perf probe: Support --del option 2009-12-09 07:26:53 +01:00
builtin-record.c perf record, x86: Print more intelligent error message when sampling fails 2009-11-23 09:40:13 +01:00
builtin-report.c perf: Make common SAMPLE_EVENT parser 2009-12-06 18:15:01 +01:00
builtin-sched.c perf sched: Add max delay time snapshot 2009-12-10 08:30:26 +01:00
builtin-stat.c perf stat: Do not print ratio when task-clock event is not counted 2009-11-15 15:25:50 +01:00
builtin-timechart.c perf: Make common SAMPLE_EVENT parser 2009-12-06 18:15:01 +01:00
builtin-top.c perf tools: Consolidate symbol resolving across all tools 2009-11-27 20:22:02 +01:00
builtin-trace.c perf: Make common SAMPLE_EVENT parser 2009-12-06 18:15:01 +01:00
builtin.h perf: Add 'perf kmem' tool 2009-11-20 09:51:41 +01:00
command-list.txt perf kmem: Add help file 2009-11-24 08:49:51 +01:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
design.txt perf_event: Add alignment-faults and emulation-faults software events 2009-10-28 16:13:03 +11:00
Makefile perf tools: Allow cross compiling 2009-12-11 11:24:13 +01:00
perf.c perf: Add 'perf kmem' tool 2009-11-20 09:51:41 +01:00
perf.h perf tools: Allow building for ARM 2009-12-11 13:50:21 +01:00