[PATCH] perf: allow specifying proc-map-timeout in config file

From: Mark Drayton
Date: Tue Dec 04 2018 - 15:34:52 EST

The default timeout of 500ms for parsing /proc/<pid>/maps files is too
short for profiling many of our services. This can be overridden by
passing --proc-map-timeout to the relevant command but it'd be nice to
globally increase our default value. This patch permits setting a
different default with the core.proc-map-timeout config file parameter.

Signed-off-by: Mark Drayton <mbd@xxxxxx>
---
tools/perf/Documentation/perf-config.txt | 6 +++++
tools/perf/builtin-kvm.c | 6 ++---
tools/perf/builtin-record.c | 8 +++---
tools/perf/builtin-top.c | 4 +--
tools/perf/builtin-trace.c | 5 ++--
tools/perf/perf.h | 1 -
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/dwarf-unwind.c | 2 +-
tools/perf/tests/mmap-thread-lookup.c | 4 +--
tools/perf/util/config.c | 4 +++
tools/perf/util/event.c | 32 ++++++++++--------------
tools/perf/util/event.h | 8 +++---
tools/perf/util/machine.c | 4 +--
tools/perf/util/machine.h | 3 ---
14 files changed, 39 insertions(+), 50 deletions(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 32f4a898e3f2..661b1fb3f8ba 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -199,6 +199,12 @@ colors.*::
Colors for headers in the output of a sub-commands (top, report).
Default values are 'white', 'blue'.

+core.*::
+ core.proc-map-timeout::
+ Sets a timeout (in milliseconds) for parsing /proc/<pid>/maps files.
+ Can be overridden by the --proc-map-timeout option on supported
+ subcommands. The default timeout is 500ms.
+
tui.*, gtk.*::
Subcommands that can be configured here are 'top', 'report' and 'annotate'.
These values are booleans, for example:
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 2b1ef704169f..3d4cbc4e87c7 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1364,7 +1364,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
"show events other than"
" HLT (x86 only) or Wait state (s390 only)"
" that take longer than duration usecs"),
- OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
+ OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_END()
};
@@ -1394,7 +1394,6 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
kvm->opts.target.uses_mmap = false;
kvm->opts.target.uid_str = NULL;
kvm->opts.target.uid = UINT_MAX;
- kvm->opts.proc_map_timeout = 500;

symbol__init(NULL);
disable_buildid_cache();
@@ -1453,8 +1452,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
perf_session__set_id_hdr_size(kvm->session);
ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
- kvm->evlist->threads, false,
- kvm->opts.proc_map_timeout, 1);
+ kvm->evlist->threads, false, 1);
err = kvm_live_open_events(kvm);
if (err)
goto out;
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 488779bc4c8d..ebb8922d436b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -641,8 +641,7 @@ static int record__synthesize_workload(struct record *rec, bool tail)
err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
process_synthesized_event,
&rec->session->machines.host,
- rec->opts.sample_address,
- rec->opts.proc_map_timeout);
+ rec->opts.sample_address);
thread_map__put(thread_map);
return err;
}
@@ -857,7 +856,7 @@ static int record__synthesize(struct record *rec, bool tail)

err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
process_synthesized_event, opts->sample_address,
- opts->proc_map_timeout, 1);
+ 1);
out:
return err;
}
@@ -1546,7 +1545,6 @@ static struct record record = {
.uses_mmap = true,
.default_per_cpu = true,
},
- .proc_map_timeout = 500,
},
.tool = {
.sample = process_sample_event,
@@ -1676,7 +1674,7 @@ static struct option __record_options[] = {
parse_clockid),
OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
"opts", "AUX area tracing Snapshot Mode", ""),
- OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
+ OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
"Record namespaces events"),
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index aa0c73e57924..a8e48dbd5b66 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1096,7 +1096,6 @@ static int __cmd_top(struct perf_top *top)

machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->threads, false,
- opts->proc_map_timeout,
top->nr_threads_synthesize);

if (top->nr_threads_synthesize > 1)
@@ -1256,7 +1255,6 @@ int cmd_top(int argc, const char **argv)
.target = {
.uses_mmap = true,
},
- .proc_map_timeout = 500,
/*
* FIXME: This will lose PERF_RECORD_MMAP and other metadata
* when we pause, fix that and reenable. Probably using a
@@ -1367,7 +1365,7 @@ int cmd_top(int argc, const char **argv)
OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
"width[,width...]",
"don't try to adjust column width, use these fixed values"),
- OPT_UINTEGER(0, "proc-map-timeout", &opts->proc_map_timeout,
+ OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
"branch any", "sample any taken branches",
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 8e3c3f74a3a4..414780649987 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1264,7 +1264,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)

err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
evlist->threads, trace__tool_process, false,
- trace->opts.proc_map_timeout, 1);
+ 1);
out:
if (err)
symbol__exit();
@@ -3393,7 +3393,6 @@ int cmd_trace(int argc, const char **argv)
.user_interval = ULLONG_MAX,
.no_buffering = true,
.mmap_pages = UINT_MAX,
- .proc_map_timeout = 500,
},
.output = stderr,
.show_comm = true,
@@ -3464,7 +3463,7 @@ int cmd_trace(int argc, const char **argv)
"Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
- OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout,
+ OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
trace__parse_cgroups),
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 0ed4a34c74c4..3bac760fa872 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -82,7 +82,6 @@ struct record_opts {
bool use_clockid;
clockid_t clockid;
u64 clockid_res_ns;
- unsigned int proc_map_timeout;
};

struct option;
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 6b049f3f5cf4..dbf2c69944d2 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -599,7 +599,7 @@ static int do_test_code_reading(bool try_kcore)
}

ret = perf_event__synthesize_thread_map(NULL, threads,
- perf_event__process, machine, false, 500);
+ perf_event__process, machine, false);
if (ret < 0) {
pr_debug("perf_event__synthesize_thread_map failed\n");
goto out_err;
diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index 2f008067d989..7c8d2e422401 100644
--- a/tools/perf/tests/dwarf-unwind.c
+++ b/tools/perf/tests/dwarf-unwind.c
@@ -34,7 +34,7 @@ static int init_live_machine(struct machine *machine)
pid_t pid = getpid();

return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
- mmap_handler, machine, true, 500);
+ mmap_handler, machine, true);
}

/*
diff --git a/tools/perf/tests/mmap-thread-lookup.c b/tools/perf/tests/mmap-thread-lookup.c
index b1af2499a3c9..5ede9b561d32 100644
--- a/tools/perf/tests/mmap-thread-lookup.c
+++ b/tools/perf/tests/mmap-thread-lookup.c
@@ -132,7 +132,7 @@ static int synth_all(struct machine *machine)
{
return perf_event__synthesize_threads(NULL,
perf_event__process,
- machine, 0, 500, 1);
+ machine, 0, 1);
}

static int synth_process(struct machine *machine)
@@ -144,7 +144,7 @@ static int synth_process(struct machine *machine)

err = perf_event__synthesize_thread_map(NULL, map,
perf_event__process,
- machine, 0, 500);
+ machine, 0);

thread_map__put(map);
return err;
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 5ac157056cdf..3beb4cf44c31 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -14,6 +14,7 @@
#include "util.h"
#include "cache.h"
#include <subcmd/exec-cmd.h>
+#include "util/event.h" /* proc_map_timeout */
#include "util/hist.h" /* perf_hist_config */
#include "util/llvm-utils.h" /* perf_llvm_config */
#include "config.h"
@@ -419,6 +420,9 @@ static int perf_buildid_config(const char *var, const char *value)
static int perf_default_core_config(const char *var __maybe_unused,
const char *value __maybe_unused)
{
+ if (!strcmp(var, "core.proc-map-timeout"))
+ proc_map_timeout = strtoul(value, NULL, 10);
+
/* Add other config variables here. */
return 0;
}
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index e9c108a6b1c3..552b4d127121 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -25,6 +25,8 @@
#include "asm/bug.h"
#include "stat.h"

+#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
+
static const char *perf_event__names[] = {
[0] = "TOTAL",
[PERF_RECORD_MMAP] = "MMAP",
@@ -72,6 +74,8 @@ static const char *perf_ns__names[] = {
[CGROUP_NS_INDEX] = "cgroup",
};

+unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
+
const char *perf_event__name(unsigned int id)
{
if (id >= ARRAY_SIZE(perf_event__names))
@@ -323,8 +327,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
pid_t pid, pid_t tgid,
perf_event__handler_t process,
struct machine *machine,
- bool mmap_data,
- unsigned int proc_map_timeout)
+ bool mmap_data)
{
char filename[PATH_MAX];
FILE *fp;
@@ -521,8 +524,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
perf_event__handler_t process,
struct perf_tool *tool,
struct machine *machine,
- bool mmap_data,
- unsigned int proc_map_timeout)
+ bool mmap_data)
{
char filename[PATH_MAX];
DIR *tasks;
@@ -548,8 +550,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
*/
if (pid == tgid &&
perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
- process, machine, mmap_data,
- proc_map_timeout))
+ process, machine, mmap_data))
return -1;

return 0;
@@ -598,7 +599,7 @@ static int __event__synthesize_thread(union perf_event *comm_event,
if (_pid == pid) {
/* process the parent's maps too */
rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
- process, machine, mmap_data, proc_map_timeout);
+ process, machine, mmap_data);
if (rc)
break;
}
@@ -612,8 +613,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
struct machine *machine,
- bool mmap_data,
- unsigned int proc_map_timeout)
+ bool mmap_data)
{
union perf_event *comm_event, *mmap_event, *fork_event;
union perf_event *namespaces_event;
@@ -643,7 +643,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
fork_event, namespaces_event,
thread_map__pid(threads, thread), 0,
process, tool, machine,
- mmap_data, proc_map_timeout)) {
+ mmap_data)) {
err = -1;
break;
}
@@ -669,7 +669,7 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
fork_event, namespaces_event,
comm_event->comm.pid, 0,
process, tool, machine,
- mmap_data, proc_map_timeout)) {
+ mmap_data)) {
err = -1;
break;
}
@@ -690,7 +690,6 @@ static int __perf_event__synthesize_threads(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
- unsigned int proc_map_timeout,
struct dirent **dirent,
int start,
int num)
@@ -734,8 +733,7 @@ static int __perf_event__synthesize_threads(struct perf_tool *tool,
*/
__event__synthesize_thread(comm_event, mmap_event, fork_event,
namespaces_event, pid, 1, process,
- tool, machine, mmap_data,
- proc_map_timeout);
+ tool, machine, mmap_data);
}
err = 0;

@@ -755,7 +753,6 @@ struct synthesize_threads_arg {
perf_event__handler_t process;
struct machine *machine;
bool mmap_data;
- unsigned int proc_map_timeout;
struct dirent **dirent;
int num;
int start;
@@ -767,7 +764,7 @@ static void *synthesize_threads_worker(void *arg)

__perf_event__synthesize_threads(args->tool, args->process,
args->machine, args->mmap_data,
- args->proc_map_timeout, args->dirent,
+ args->dirent,
args->start, args->num);
return NULL;
}
@@ -776,7 +773,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine,
bool mmap_data,
- unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize)
{
struct synthesize_threads_arg *args = NULL;
@@ -806,7 +802,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
if (thread_nr <= 1) {
err = __perf_event__synthesize_threads(tool, process,
machine, mmap_data,
- proc_map_timeout,
dirent, base, n);
goto free_dirent;
}
@@ -828,7 +823,6 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
args[i].process = process;
args[i].machine = machine;
args[i].mmap_data = mmap_data;
- args[i].proc_map_timeout = proc_map_timeout;
args[i].dirent = dirent;
}
for (i = 0; i < m; i++) {
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index bfa60bcafbde..eb95f3384958 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -669,8 +669,7 @@ typedef int (*perf_event__handler_t)(struct perf_tool *tool,
int perf_event__synthesize_thread_map(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
- struct machine *machine, bool mmap_data,
- unsigned int proc_map_timeout);
+ struct machine *machine, bool mmap_data);
int perf_event__synthesize_thread_map2(struct perf_tool *tool,
struct thread_map *threads,
perf_event__handler_t process,
@@ -682,7 +681,6 @@ int perf_event__synthesize_cpu_map(struct perf_tool *tool,
int perf_event__synthesize_threads(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine, bool mmap_data,
- unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize);
int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
@@ -797,8 +795,7 @@ int perf_event__synthesize_mmap_events(struct perf_tool *tool,
pid_t pid, pid_t tgid,
perf_event__handler_t process,
struct machine *machine,
- bool mmap_data,
- unsigned int proc_map_timeout);
+ bool mmap_data);

int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
perf_event__handler_t process,
@@ -829,5 +826,6 @@ int perf_event_paranoid(void);

extern int sysctl_perf_event_max_stack;
extern int sysctl_perf_event_max_contexts_per_stack;
+extern unsigned int proc_map_timeout;

#endif /* __PERF_RECORD_H */
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 8f36ce813bc5..8551b3e75bb2 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2493,15 +2493,13 @@ int machines__for_each_thread(struct machines *machines,
int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
struct target *target, struct thread_map *threads,
perf_event__handler_t process, bool data_mmap,
- unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize)
{
if (target__has_task(target))
- return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap, proc_map_timeout);
+ return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
else if (target__has_cpu(target))
return perf_event__synthesize_threads(tool, process,
machine, data_mmap,
- proc_map_timeout,
nr_threads_synthesize);
/* command specified */
return 0;
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index d856b85862e2..688d84ba823a 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -247,17 +247,14 @@ int machines__for_each_thread(struct machines *machines,
int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
struct target *target, struct thread_map *threads,
perf_event__handler_t process, bool data_mmap,
- unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize);
static inline
int machine__synthesize_threads(struct machine *machine, struct target *target,
struct thread_map *threads, bool data_mmap,
- unsigned int proc_map_timeout,
unsigned int nr_threads_synthesize)
{
return __machine__synthesize_threads(machine, NULL, target, threads,
perf_event__process, data_mmap,
- proc_map_timeout,
nr_threads_synthesize);
}

--
2.17.1