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authorAhelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>2022-12-27 23:57:40 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2024-01-05 00:29:17 +0300
commit6af6d22495efeb00cb4e220a4e6e30b5be3afdf3 (patch)
tree2be11fd75a5e06e63d590eb3b9cb06f026e2095b /tools/perf
parent360b045fceb282fb21b66131c396b0f85759ddb7 (diff)
downloadlinux-6af6d22495efeb00cb4e220a4e6e30b5be3afdf3.tar.xz
perf TUI: Don't ignore job control
In its infinite wisdom, by default, SLang sets susp undef, and this can only be un-done by calling SLtty_set_suspend_state(true). After every SLang_init_tty(). Additionally, no provisions are made for maintaining the teletype attributes across suspend/continue (outside of curses emulation mode(?!), which provides full support, naturally), so we need to save and restore the flags ourselves, as well as reset the text colours when going under. We need to also re-draw the screen, and raising SIGWINCH, shockingly, Just Works. The correct solution would be to Not Use SLang, but as a stop-gap, this makes TUI 'perf report' usable. Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: yaowenbin <yaowenbin1@huawei.com> Link: https://lore.kernel.org/r/0354dcae23a8713f75f4fed609e0caec3c6e3cd5.1672174189.git.nabijaczleweli@nabijaczleweli.xyz Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/ui/browsers/annotate.c1
-rw-r--r--tools/perf/ui/browsers/hists.c2
-rw-r--r--tools/perf/ui/browsers/scripts.c1
-rw-r--r--tools/perf/ui/tui/setup.c22
4 files changed, 26 insertions, 0 deletions
diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index cb2eb6dcb532..ec5e21932876 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -938,6 +938,7 @@ int hist_entry__tui_annotate(struct hist_entry *he, struct evsel *evsel,
/* reset abort key so that it can get Ctrl-C as a key */
SLang_reset_tty();
SLang_init_tty(0, 0, 0);
+ SLtty_set_suspend_state(true);
return map_symbol__tui_annotate(&he->ms, evsel, hbt);
}
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 3061dea29e6b..0c02b3a8e121 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -3000,6 +3000,7 @@ static int evsel__hists_browse(struct evsel *evsel, int nr_events, const char *h
/* reset abort key so that it can get Ctrl-C as a key */
SLang_reset_tty();
SLang_init_tty(0, 0, 0);
+ SLtty_set_suspend_state(true);
if (min_pcnt)
browser->min_pcnt = min_pcnt;
@@ -3667,6 +3668,7 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
/* reset abort key so that it can get Ctrl-C as a key */
SLang_reset_tty();
SLang_init_tty(0, 0, 0);
+ SLtty_set_suspend_state(true);
memset(&action, 0, sizeof(action));
diff --git a/tools/perf/ui/browsers/scripts.c b/tools/perf/ui/browsers/scripts.c
index 47d2c7a8cbe1..50d45054ed6c 100644
--- a/tools/perf/ui/browsers/scripts.c
+++ b/tools/perf/ui/browsers/scripts.c
@@ -166,6 +166,7 @@ void run_script(char *cmd)
printf("\033[c\033[H\033[J");
fflush(stdout);
SLang_init_tty(0, 0, 0);
+ SLtty_set_suspend_state(true);
SLsmg_refresh();
}
diff --git a/tools/perf/ui/tui/setup.c b/tools/perf/ui/tui/setup.c
index 605d9e175ea7..16c6eff4d241 100644
--- a/tools/perf/ui/tui/setup.c
+++ b/tools/perf/ui/tui/setup.c
@@ -2,12 +2,14 @@
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
+#include <termios.h>
#include <unistd.h>
#include <linux/kernel.h>
#ifdef HAVE_BACKTRACE_SUPPORT
#include <execinfo.h>
#endif
+#include "../../util/color.h"
#include "../../util/debug.h"
#include "../browser.h"
#include "../helpline.h"
@@ -121,6 +123,23 @@ static void ui__signal(int sig)
exit(0);
}
+static void ui__sigcont(int sig)
+{
+ static struct termios tty;
+
+ if (sig == SIGTSTP) {
+ while (tcgetattr(SLang_TT_Read_FD, &tty) == -1 && errno == EINTR)
+ ;
+ while (write(SLang_TT_Read_FD, PERF_COLOR_RESET, sizeof(PERF_COLOR_RESET) - 1) == -1 && errno == EINTR)
+ ;
+ raise(SIGSTOP);
+ } else {
+ while (tcsetattr(SLang_TT_Read_FD, TCSADRAIN, &tty) == -1 && errno == EINTR)
+ ;
+ raise(SIGWINCH);
+ }
+}
+
int ui__init(void)
{
int err;
@@ -135,6 +154,7 @@ int ui__init(void)
err = SLang_init_tty(-1, 0, 0);
if (err < 0)
goto out;
+ SLtty_set_suspend_state(true);
err = SLkp_init();
if (err < 0) {
@@ -149,6 +169,8 @@ int ui__init(void)
signal(SIGINT, ui__signal);
signal(SIGQUIT, ui__signal);
signal(SIGTERM, ui__signal);
+ signal(SIGTSTP, ui__sigcont);
+ signal(SIGCONT, ui__sigcont);
perf_error__register(&perf_tui_eops);