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Subject[PATCH 01/25] perf top: Stop using exit()
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Just return to the perf main() routine so that an unified exit path can
be followed and resources released, helping in finding memory leaks.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ro8oeodo96490nrhcph57atr@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 56 ++++++++++++++++++++++++++++--------------------
1 file changed, 33 insertions(+), 23 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 7978c81..903e4f4 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -68,6 +68,8 @@
#include <linux/unistd.h>
#include <linux/types.h>

+static volatile int done;
+
static void perf_top__update_print_entries(struct perf_top *top)
{
if (top->print_entries > 9)
@@ -431,8 +433,10 @@ static int perf_top__key_mapped(struct perf_top *top, int c)
return 0;
}

-static void perf_top__handle_keypress(struct perf_top *top, int c)
+static bool perf_top__handle_keypress(struct perf_top *top, int c)
{
+ bool ret = true;
+
if (!perf_top__key_mapped(top, c)) {
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
struct termios tc, save;
@@ -453,7 +457,7 @@ static void perf_top__handle_keypress(struct perf_top *top, int c)

tcsetattr(0, TCSAFLUSH, &save);
if (!perf_top__key_mapped(top, c))
- return;
+ return ret;
}

switch (c) {
@@ -515,7 +519,8 @@ static void perf_top__handle_keypress(struct perf_top *top, int c)
printf("exiting.\n");
if (top->dump_symtab)
perf_session__fprintf_dsos(top->session, stderr);
- exit(0);
+ ret = false;
+ break;
case 's':
perf_top__prompt_symbol(top, "Enter details symbol");
break;
@@ -538,6 +543,8 @@ static void perf_top__handle_keypress(struct perf_top *top, int c)
default:
break;
}
+
+ return ret;
}

static void perf_top__sort_new_samples(void *arg)
@@ -579,8 +586,7 @@ static void *display_thread_tui(void *arg)
perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
&top->session->header.env);

- exit_browser(0);
- exit(0);
+ done = 1;
return NULL;
}

@@ -604,7 +610,7 @@ repeat:
/* trash return*/
getc(stdin);

- while (1) {
+ while (!done) {
perf_top__print_sym_table(top);
/*
* Either timeout expired or we got an EINTR due to SIGWINCH,
@@ -618,15 +624,14 @@ repeat:
continue;
/* Fall trhu */
default:
- goto process_hotkey;
+ c = getc(stdin);
+ tcsetattr(0, TCSAFLUSH, &save);
+
+ if (perf_top__handle_keypress(top, c))
+ goto repeat;
+ done = 1;
}
}
-process_hotkey:
- c = getc(stdin);
- tcsetattr(0, TCSAFLUSH, &save);
-
- perf_top__handle_keypress(top, c);
- goto repeat;

return NULL;
}
@@ -705,7 +710,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
}

if (!machine) {
- pr_err("%u unprocessable samples recorded.\n",
+ pr_err("%u unprocessable samples recorded.\r",
top->session->stats.nr_unprocessable_samples++);
return;
}
@@ -868,7 +873,7 @@ static void perf_top__mmap_read(struct perf_top *top)
perf_top__mmap_read_idx(top, i);
}

-static void perf_top__start_counters(struct perf_top *top)
+static int perf_top__start_counters(struct perf_top *top)
{
char msg[512];
struct perf_evsel *counter;
@@ -900,11 +905,10 @@ try_again:
goto out_err;
}

- return;
+ return 0;

out_err:
- exit_browser(0);
- exit(0);
+ return -1;
}

static int perf_top__setup_sample_type(struct perf_top *top)
@@ -948,7 +952,11 @@ static int __cmd_top(struct perf_top *top)
else
perf_event__synthesize_threads(&top->tool, perf_event__process,
&top->session->machines.host);
- perf_top__start_counters(top);
+
+ ret = perf_top__start_counters(top);
+ if (ret)
+ goto out_delete;
+
top->session->evlist = top->evlist;
perf_session__set_id_hdr_size(top->session);

@@ -968,10 +976,11 @@ static int __cmd_top(struct perf_top *top)

perf_top__mmap_read(top);

+ ret = -1;
if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
display_thread), top)) {
ui__error("Could not create display thread.\n");
- exit(-1);
+ goto out_delete;
}

if (top->realtime_prio) {
@@ -980,11 +989,11 @@ static int __cmd_top(struct perf_top *top)
param.sched_priority = top->realtime_prio;
if (sched_setscheduler(0, SCHED_FIFO, &param)) {
ui__error("Could not set realtime priority.\n");
- exit(-1);
+ goto out_delete;
}
}

- while (1) {
+ while (!done) {
u64 hits = top->samples;

perf_top__mmap_read(top);
@@ -993,11 +1002,12 @@ static int __cmd_top(struct perf_top *top)
ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
}

+ ret = 0;
out_delete:
perf_session__delete(top->session);
top->session = NULL;

- return 0;
+ return ret;
}

static int
--
1.8.1.1.361.gec3ae6e


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