Implement a simple, full-screen log window which shows error messages
saved so far. Press 'l' (lower-case 'L') key to display the log
window. It'll be used usually with -v option.
Protect updating log by ui__lock to prevent the linemap reallocation
during log window refresh (it led to a segfault) and add
linemap_changed member to perf_log in order to detect the change.
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
tools/perf/Makefile.perf | 1 +
tools/perf/ui/browser.h | 1 +
tools/perf/ui/browsers/hists.c | 5 ++
tools/perf/ui/browsers/log.c | 132 +++++++++++++++++++++++++++++++++++++++++
tools/perf/util/debug.h | 1 +
tools/perf/util/log.c | 2 +
6 files changed, 142 insertions(+)
create mode 100644 tools/perf/ui/browsers/log.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 2b5252f09c04..51d87a25d17d 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -491,6 +491,7 @@ ifndef NO_SLANG
LIB_OBJS += $(OUTPUT)ui/browsers/map.o
LIB_OBJS += $(OUTPUT)ui/browsers/scripts.o
LIB_OBJS += $(OUTPUT)ui/browsers/header.o
+ LIB_OBJS += $(OUTPUT)ui/browsers/log.o
LIB_OBJS += $(OUTPUT)ui/tui/setup.o
LIB_OBJS += $(OUTPUT)ui/tui/util.o
LIB_OBJS += $(OUTPUT)ui/tui/helpline.o
diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
index 118cca29dd26..1f676c8ec4f3 100644
--- a/tools/perf/ui/browser.h
+++ b/tools/perf/ui/browser.h
@@ -61,6 +61,7 @@ int ui_browser__input_window(const char *title, const char
*text, char *input,
const char *exit_msg, int delay_sec);
struct perf_session_env;
int tui__header_window(struct perf_session_env *env);
+int tui__log_window(void);
void ui_browser__argv_seek(struct ui_browser *browser, off_t offset, int
whence);
unsigned int ui_browser__argv_refresh(struct ui_browser *browser);
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index b720b92eba6e..e0ab399d431d 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1416,6 +1416,7 @@ static int perf_evsel__hists_browse(struct perf_evsel
*evsel, int nr_events,
/* help messages are sorted by lexical order of the hotkey */
const char report_help[] = HIST_BROWSER_HELP_COMMON
"i Show header information\n"
+ "l Show log messages\n"
"P Print histograms to perf.hist.N\n"
"r Run available scripts\n"
"s Switch to another data file in PWD\n"
@@ -1423,6 +1424,7 @@ static int perf_evsel__hists_browse(struct perf_evsel
*evsel, int nr_events,
"V Verbose (DSO names in callchains, etc)\n"
"/ Filter symbol by name";
const char top_help[] = HIST_BROWSER_HELP_COMMON
+ "l Show log messages\n"
"P Print histograms to perf.hist.N\n"
"t Zoom into current Thread\n"
"V Verbose (DSO names in callchains, etc)\n"
@@ -1517,6 +1519,9 @@ static int perf_evsel__hists_browse(struct perf_evsel
*evsel, int nr_events,
if (env->arch)
tui__header_window(env);
continue;
+ case 'l':
+ tui__log_window();
+ continue;
case K_F1:
case 'h':
case '?':
diff --git a/tools/perf/ui/browsers/log.c b/tools/perf/ui/browsers/log.c
new file mode 100644
index 000000000000..c64aeb8f9aac
--- /dev/null
+++ b/tools/perf/ui/browsers/log.c
@@ -0,0 +1,132 @@
+#include <stdio.h>
+
+#include "perf.h"
+#include "util/util.h"
+#include "util/cache.h"
+#include "util/debug.h"
+#include "ui/ui.h"
+#include "ui/util.h"
+#include "ui/browser.h"
+#include "ui/libslang.h"
+#include "ui/keysyms.h"
+
+static void ui_browser__file_seek(struct ui_browser *browser __maybe_unused,
+ off_t offset __maybe_unused,
+ int whence __maybe_unused)
+{
+ /* do nothing */
+}
+
+static void ui_browser__file_write(struct ui_browser *browser,
+ void *entry, int row)
+{
+ char buf[1024];
+ char empty[] = " ";
+ FILE *fp = perf_log.fp;
+ bool current_entry = ui_browser__is_current_entry(browser, row);
+ off_t *linemap = perf_log.linemap;
+ unsigned int idx = *(unsigned int *)entry;
+ unsigned long offset = (unsigned long)browser->priv;
+
+ fseek(fp, linemap[idx], SEEK_SET);
+ if (fgets(buf, sizeof(buf), fp) == NULL)
+ return;
+
+ ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
+ HE_COLORSET_NORMAL);
+
+ if (offset < strlen(buf))
+ slsmg_write_nstring(&buf[offset], browser->width);
+ else
+ slsmg_write_nstring(empty, browser->width);
+}
+
+static unsigned int ui_browser__file_refresh(struct ui_browser *browser)
+{
+ unsigned int row = 0;
+ unsigned int idx = browser->top_idx;
+ fpos_t pos;
+
+ fgetpos(perf_log.fp, &pos);
+
+ if (perf_log.linemap_changed) {
+ /* update log window with new linemap */
+ browser->entries = perf_log.linemap;
+ browser->nr_entries = perf_log.lines;
+ perf_log.linemap_changed = false;
+ }
+
+ while (idx < browser->nr_entries) {
+ ui_browser__gotorc(browser, row, 0);
+ browser->write(browser, &idx, row);
+ if (++row == browser->height)
+ break;
+
+ ++idx;
+ }
+
+ fsetpos(perf_log.fp, &pos);
+ return row;
+}
+
+static int log_menu__run(struct ui_browser *menu)
+{
+ int key;
+ unsigned long offset;
+ const char help[] =
+ "h/?/F1 Show this window\n"
+ "UP/DOWN/PGUP\n"
+ "PGDN/SPACE\n"
+ "LEFT/RIGHT Navigate\n"
+ "q/ESC/CTRL+C Exit browser";
+
+ if (ui_browser__show(menu, "Log messages", "Press 'q' to exit") < 0)
+ return -1;
+
+ while (1) {
+ key = ui_browser__run(menu, 0);
+
+ switch (key) {
+ case K_RIGHT:
+ offset = (unsigned long)menu->priv;
+ offset += 10;
+ menu->priv = (void *)offset;
+ continue;
+ case K_LEFT:
+ offset = (unsigned long)menu->priv;
+ if (offset >= 10)
+ offset -= 10;
+ menu->priv = (void *)offset;
+ continue;
+ case K_F1:
+ case 'h':
+ case '?':
+ ui_browser__help_window(menu, help);
+ continue;
+ case K_ESC:
+ case 'q':
+ case CTRL('c'):
+ key = -1;
+ break;
+ default:
+ continue;
+ }
+
+ break;
+ }
+
+ ui_browser__hide(menu);
+ return key;
+}
+
+int tui__log_window(void)
+{
+ struct ui_browser log_menu = {
+ .refresh = ui_browser__file_refresh,
+ .seek = ui_browser__file_seek,
+ .write = ui_browser__file_write,
+ .nr_entries = perf_log.lines,
+ };
+
+ return log_menu__run(&log_menu);
+}
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 2d69e9fa6499..469abfcdc7c0 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -25,6 +25,7 @@ struct perf_log {
u32 lines;
u32 nr_alloc;
bool seen_newline;
+ bool linemap_changed;
};
extern struct perf_log perf_log;
diff --git a/tools/perf/util/log.c b/tools/perf/util/log.c
index cb94417da435..4b05345c35c7 100644
--- a/tools/perf/util/log.c
+++ b/tools/perf/util/log.c
@@ -99,6 +99,8 @@ void perf_log__add(const char *msg)
/* restore original offset */
fseeko(fp, offset, SEEK_SET);
perf_log.lines = saved_lines;
+ } else {
+ perf_log.linemap_changed = true;
}
pthread_mutex_unlock(&ui__lock);
}
--
1.7.11.7
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