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Message-ID: <tip-4b3a2716dd785fabb9f6ac80c1d53cb29a88169d@git.kernel.org>
Date: Thu, 28 Dec 2017 07:32:07 -0800
From: tip-bot for Masami Hiramatsu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: bhargavaramudu@...il.com, ravi.bangoria@...ux.vnet.ibm.com,
acme@...hat.com, hpa@...or.com, mhiramat@...nel.org,
tglx@...utronix.de, mingo@...nel.org, pc@...ibm.com,
linux-kernel@...r.kernel.org, tmricht@...ux.vnet.ibm.com
Subject: [tip:perf/core] perf probe: Find versioned symbols from map
Commit-ID: 4b3a2716dd785fabb9f6ac80c1d53cb29a88169d
Gitweb: https://git.kernel.org/tip/4b3a2716dd785fabb9f6ac80c1d53cb29a88169d
Author: Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Sat, 9 Dec 2017 01:28:12 +0900
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 27 Dec 2017 12:15:54 -0300
perf probe: Find versioned symbols from map
Commit d80406453ad4 ("perf symbols: Allow user probes on versioned
symbols") allows user to find default versioned symbols (with "@@") in
map. However, it did not enable normal versioned symbol (with "@") for
perf-probe. E.g.
=====
# ./perf probe -x /lib64/libc-2.25.so malloc_get_state
Failed to find symbol malloc_get_state in /usr/lib64/libc-2.25.so
Error: Failed to add events.
=====
This solves above issue by improving perf-probe symbol search function,
as below.
=====
# ./perf probe -x /lib64/libc-2.25.so malloc_get_state
Added new event:
probe_libc:malloc_get_state (on malloc_get_state in /usr/lib64/libc-2.25.so)
You can now use it in all perf tools, such as:
perf record -e probe_libc:malloc_get_state -aR sleep 1
# ./perf probe -l
probe_libc:malloc_get_state (on malloc_get_state@...BC_2.2.5 in /usr/lib64/libc-2.25.so)
=====
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Reviewed-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Acked-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Clarke <pc@...ibm.com>
Cc: bhargavb <bhargavaramudu@...il.com>
Cc: linux-rt-users@...r.kernel.org
Link: http://lkml.kernel.org/r/151275049269.24652.1639103455496216255.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/arch/powerpc/util/sym-handling.c | 8 ++++++++
tools/perf/util/probe-event.c | 20 ++++++++++++++++++--
tools/perf/util/symbol.c | 5 +++++
tools/perf/util/symbol.h | 1 +
4 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index 9c4e23d..53d83d7 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -64,6 +64,14 @@ int arch__compare_symbol_names_n(const char *namea, const char *nameb,
return strncmp(namea, nameb, n);
}
+
+const char *arch__normalize_symbol_name(const char *name)
+{
+ /* Skip over initial dot */
+ if (name && *name == '.')
+ name++;
+ return name;
+}
#endif
#if defined(_CALL_ELF) && _CALL_ELF == 2
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index a68141d..0d6c66d 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2801,16 +2801,32 @@ static int find_probe_functions(struct map *map, char *name,
int found = 0;
struct symbol *sym;
struct rb_node *tmp;
+ const char *norm, *ver;
+ char *buf = NULL;
if (map__load(map) < 0)
return 0;
map__for_each_symbol(map, sym, tmp) {
- if (strglobmatch(sym->name, name)) {
+ norm = arch__normalize_symbol_name(sym->name);
+ if (!norm)
+ continue;
+
+ /* We don't care about default symbol or not */
+ ver = strchr(norm, '@');
+ if (ver) {
+ buf = strndup(norm, ver - norm);
+ if (!buf)
+ return -ENOMEM;
+ norm = buf;
+ }
+ if (strglobmatch(norm, name)) {
found++;
if (syms && found < probe_conf.max_probes)
syms[found - 1] = sym;
}
+ if (buf)
+ zfree(&buf);
}
return found;
@@ -2856,7 +2872,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
* same name but different addresses, this lists all the symbols.
*/
num_matched_functions = find_probe_functions(map, pp->function, syms);
- if (num_matched_functions == 0) {
+ if (num_matched_functions <= 0) {
pr_err("Failed to find symbol %s in %s\n", pp->function,
pev->target ? : "kernel");
ret = -ENOENT;
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 1b67a86..cc065d4 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -94,6 +94,11 @@ static int prefix_underscores_count(const char *str)
return tail - str;
}
+const char * __weak arch__normalize_symbol_name(const char *name)
+{
+ return name;
+}
+
int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
{
return strcmp(namea, nameb);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index a4f0075..0563f33 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -349,6 +349,7 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
void arch__sym_update(struct symbol *s, GElf_Sym *sym);
#endif
+const char *arch__normalize_symbol_name(const char *name);
#define SYMBOL_A 0
#define SYMBOL_B 1
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