This is a note to let you know that I've just added the patch titled
perf top: Fix window dimensions change handling
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-top-fix-window-dimensions-change-handling.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Feb 23 11:58:50 CET 2018
From: Jiri Olsa <jolsa@xxxxxxxxxx>
Date: Tue, 14 Nov 2017 10:23:39 +0100
Subject: perf top: Fix window dimensions change handling
From: Jiri Olsa <jolsa@xxxxxxxxxx>
[ Upstream commit 89d0aeab4252adc2a7ea693637dd21c588bfa2d1 ]
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@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Tested-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-ysuzwz77oev1ftgvdscn9bpu@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/builtin-top.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -70,6 +70,7 @@
#include <linux/types.h>
static volatile int done;
+static volatile int resize;
#define HEADER_LINE_NR 5
@@ -79,10 +80,13 @@ static void perf_top__update_print_entri
}
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);
}
@@ -466,7 +470,7 @@ static bool perf_top__handle_keypress(st
.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);
@@ -1023,6 +1027,11 @@ static int __cmd_top(struct perf_top *to
if (hits == top->samples)
ret = perf_evlist__poll(top->evlist, 100);
+
+ if (resize) {
+ perf_top__resize(top);
+ resize = 0;
+ }
}
ret = 0;
Patches currently in stable-queue which might be from jolsa@xxxxxxxxxx are
queue-4.4/perf-top-fix-window-dimensions-change-handling.patch