linux-kernel - [tip:perf/core] perf top: Fix window dimensions change handling

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Date:   Tue, 28 Nov 2017 22:34:21 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     ravi.bangoria@...ux.vnet.ibm.com, hpa@...or.com, acme@...hat.com,
        wangnan0@...wei.com, linux-kernel@...r.kernel.org,
        andi@...stfloor.org, jolsa@...nel.org, namhyung@...nel.org,
        tglx@...utronix.de, mingo@...nel.org, adrian.hunter@...el.com,
        dsahern@...il.com
Subject: [tip:perf/core] perf top: Fix window dimensions change handling

Commit-ID:  89d0aeab4252adc2a7ea693637dd21c588bfa2d1
Gitweb:     https://git.kernel.org/tip/89d0aeab4252adc2a7ea693637dd21c588bfa2d1
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Tue, 14 Nov 2017 10:23:39 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 28 Nov 2017 14:27:20 -0300

perf top: Fix window dimensions change handling

The stdio perf top crashes when we change the terminal
window size. The reason is that we assumed we get the
perf_top pointer as a signal handler argument which is
not the case.

Changing the SIGWINCH handler logic to change global
resize variable, which is checked in the main thread
loop.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Tested-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-ysuzwz77oev1ftgvdscn9bpu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 1b01c27..4895738 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -77,6 +77,7 @@
 #include "sane_ctype.h"
 
 static volatile int done;
+static volatile int resize;
 
 #define HEADER_LINE_NR  5
 
@@ -86,10 +87,13 @@ static void perf_top__update_print_entries(struct perf_top *top)
 }
 
 static void perf_top__sig_winch(int sig __maybe_unused,
-				siginfo_t *info __maybe_unused, void *arg)
+				siginfo_t *info __maybe_unused, void *arg __maybe_unused)
 {
-	struct perf_top *top = arg;
+	resize = 1;
+}
 
+static void perf_top__resize(struct perf_top *top)
+{
 	get_term_dimensions(&top->winsize);
 	perf_top__update_print_entries(top);
 }
@@ -477,7 +481,7 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
 					.sa_sigaction = perf_top__sig_winch,
 					.sa_flags     = SA_SIGINFO,
 				};
-				perf_top__sig_winch(SIGWINCH, NULL, top);
+				perf_top__resize(top);
 				sigaction(SIGWINCH, &act, NULL);
 			} else {
 				signal(SIGWINCH, SIG_DFL);
@@ -1032,6 +1036,11 @@ static int __cmd_top(struct perf_top *top)
 
 		if (hits == top->samples)
 			ret = perf_evlist__poll(top->evlist, 100);
+
+		if (resize) {
+			perf_top__resize(top);
+			resize = 0;
+		}
 	}
 
 	ret = 0;