| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1337801535-12865-15-git-send-email-jolsa@redhat.com>
Date: Wed, 23 May 2012 21:32:13 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com
Cc: eranian@...gle.com, gorcunov@...nvz.org, tzanussi@...il.com,
mhiramat@...hat.com, robert.richter@....com, fche@...hat.com,
linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org,
Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 14/16] perf, tool: Support for dwarf mode callchain on perf record
This patch enables perf to use the dwarf unwind code.
It extends the perf record '-g' option with following arguments:
'fp' - provides framepointer based user
stack backtrace
'dwarf[,size]' - provides dwarf (libunwind) based user stack
backtrace. The size specifies the size of the
user stack dump. If ommited it is 8192 by default.
If libunwind is found during the perf build, then the 'dwarf'
argument becomes available for record command. The 'fp' stays as
default option in any case.
Examples: (perf compiled with libunwind)
perf record -g dwarf ls
- provides dwarf unwind with 8192 as stack dump size
perf record -g dwarf,4096 ls
- provides dwarf unwind with 4096 as stack dump size
perf record -g -- ls
perf record -g fp ls
- provides frame pointer unwind
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Jiri Olsa <jolsa@...hat.com>
---
tools/perf/builtin-record.c | 86 ++++++++++++++++++++++++++++++++++++++++++-
tools/perf/perf.h | 9 ++++-
tools/perf/util/evsel.c | 13 ++++++-
3 files changed, 104 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e5cb084..8479bf0 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -31,6 +31,15 @@
#include <sched.h>
#include <sys/mman.h>
+#define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
+
+#ifdef NO_LIBUNWIND_SUPPORT
+static char callchain_help[] = CALLCHAIN_HELP "[fp]";
+#else
+static unsigned long default_stack_dump_size = 8192;
+static char callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
+#endif
+
enum write_mode_t {
WRITE_FORCE,
WRITE_APPEND
@@ -732,6 +741,78 @@ error:
return ret;
}
+static int
+parse_callchain_opt(const struct option *opt __used, const char *arg,
+ int unset)
+{
+ struct perf_record *rec = (struct perf_record *)opt->value;
+ char *tok, *name, *saveptr = NULL;
+ char buf[20];
+ int ret = -1;
+
+ /* --no-call-graph */
+ if (unset)
+ return 0;
+
+ /* We specified default option if none is provided. */
+ BUG_ON(!arg);
+
+ /* We need buffer that we know we can write to. */
+ snprintf(buf, 20, "%s", arg);
+
+ tok = strtok_r((char *)buf, ",", &saveptr);
+ name = tok ? : (char *)buf;
+
+ do {
+ /* Framepointer style */
+ if (!strncmp(name, "fp", sizeof("fp"))) {
+ if (!strtok_r(NULL, ",", &saveptr)) {
+ rec->opts.call_graph = CALLCHAIN_FP;
+ ret = 0;
+ } else
+ pr_err("callchain: No more arguments "
+ "needed for -g fp\n");
+ break;
+
+#ifndef NO_LIBUNWIND_SUPPORT
+ /* Dwarf style */
+ } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
+ ret = 0;
+ rec->opts.call_graph = CALLCHAIN_DWARF;
+ rec->opts.stack_dump_size = default_stack_dump_size;
+
+ tok = strtok_r(NULL, ",", &saveptr);
+ if (tok) {
+ char *endptr;
+ unsigned long size;
+
+ size = strtoul(tok, &endptr, 0);
+ if (*endptr) {
+ pr_err("callchain: Incorrect stack "
+ "dump size: %s\n", tok);
+ ret = -1;
+ }
+
+ rec->opts.stack_dump_size = size;
+ }
+
+ pr_debug("callchain: stack dump size %lu\n",
+ rec->opts.stack_dump_size);
+#endif
+ } else {
+ pr_err("callchain: Unknown -g option "
+ "value: %s\n", name);
+ break;
+ }
+
+ } while (0);
+
+ if (!ret)
+ pr_debug("callchain: type %d\n", rec->opts.call_graph);
+
+ return ret;
+}
+
static const char * const record_usage[] = {
"perf record [<options>] [<command>]",
"perf record [<options>] -- <command> [<options>]",
@@ -803,8 +884,9 @@ const struct option record_options[] = {
"number of mmap data pages"),
OPT_BOOLEAN(0, "group", &record.opts.group,
"put the counters into a counter group"),
- OPT_BOOLEAN('g', "call-graph", &record.opts.call_graph,
- "do call-graph (stack chain/backtrace) recording"),
+ OPT_CALLBACK_DEFAULT('g', "call-graph", &record, "mode,dump_size",
+ callchain_help, &parse_callchain_opt,
+ "fp"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 14f1034..2cd9c15 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -209,9 +209,15 @@ void pthread__unblock_sigwinch(void);
#include "util/target.h"
+enum perf_call_graph_mode {
+ CALLCHAIN_NONE,
+ CALLCHAIN_FP,
+ CALLCHAIN_DWARF
+};
+
struct perf_record_opts {
struct perf_target target;
- bool call_graph;
+ int call_graph;
bool group;
bool inherit_stat;
bool no_delay;
@@ -230,6 +236,7 @@ struct perf_record_opts {
int branch_stack;
u64 default_interval;
u64 user_interval;
+ unsigned long stack_dump_size;
};
#endif
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8d21d2c..520d4b2 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -16,6 +16,7 @@
#include "cpumap.h"
#include "thread_map.h"
#include "target.h"
+#include "perf_regs.h"
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
@@ -106,9 +107,19 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts,
attr->mmap_data = track;
}
- if (opts->call_graph)
+ if (opts->call_graph) {
attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
+ if (opts->call_graph == CALLCHAIN_DWARF) {
+ attr->sample_type |= PERF_SAMPLE_REGS|PERF_SAMPLE_STACK;
+ attr->sample_regs = PERF_SAMPLE_REGS_USER;
+ attr->sample_regs_user = PERF_REGS_MASK;
+ attr->sample_stack = PERF_SAMPLE_STACK_USER;
+ attr->sample_stack_user = opts->stack_dump_size;
+ attr->exclude_user_callchain = 1;
+ }
+ }
+
if (perf_target__has_cpu(&opts->target))
attr->sample_type |= PERF_SAMPLE_CPU;
--
1.7.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists