Re: [PATCH 07/12] perf hists browser: Allow passing an initial hotkey

Arnaldo Carvalho de Melo
2019-12-19T17:26:47Z

Em Wed, Dec 18, 2019 at 03:23:21PM +0100, Jiri Olsa escreveu:
> On Wed, Dec 18, 2019 at 11:08:31AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Dec 18, 2019 at 09:08:18AM +0100, Jiri Olsa escreveu:
> > > On Tue, Dec 17, 2019 at 11:48:23AM -0300, Arnaldo Carvalho de Melo wrote:
> > > > + if (key)
> > > > + goto do_hotkey;
> > > > +
> > > > while (1) {
> > > > key = ui_browser__run(&browser->b, delay_secs);
> > > > -
> > > > +do_hotkey:

> > > or we could switch the 'swtich' and ui_browser__run, and get rid of the goto, like:

> > > while (1) {
> > > switch (key) {
> > > ...
> > > }
> > >
> > > key = ui_browser__run(&browser->b, delay_secs);
> > > }

> > I think those are equivalent and having the test like I did is more
> > clear, i.e. "has this key been provided" instead of going to the switch
> > just to hit the default case for the zero in key and call
> > ui_browser__run().

> sure, I just don't like goto other than for error handling,
> looks too hacky to me ;-) but of course it's your call

How about the one below?

- Arnaldo

commit 9290297c911ad6c315c5f46f35afa3ce517a4c9f
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Thu Dec 12 15:31:40 2019 -0300

perf hists browser: Allow passing an initial hotkey

Sometimes we're in an outer code, like the main hists browser popup menu
and the user follows a suggestion about using some hotkey, and that
hotkey is really handled by hists_browser__run(), so allow for calling
it with that hotkey, making it handle it instead of waiting for the user
to press one.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-xv2l7i6o4urn37nv1h40ryfs@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index e69f44941aad..346351260c0b 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -2384,7 +2384,7 @@ static int perf_c2c__browse_cacheline(struct hist_entry *he)
c2c_browser__update_nr_entries(browser);

while (1) {
- key = hist_browser__run(browser, "? - help", true);
+ key = hist_browser__run(browser, "? - help", true, 0);

switch (key) {
case 's':
@@ -2453,7 +2453,7 @@ static int perf_c2c__hists_browse(struct hists *hists)
c2c_browser__update_nr_entries(browser);

while (1) {
- key = hist_browser__run(browser, "? - help", true);
+ key = hist_browser__run(browser, "? - help", true, 0);

switch (key) {
case 'q':
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 6dfdd8d5a743..ac118aef5ed1 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -672,10 +672,81 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
return browser->title ? browser->title(browser, bf, size) : 0;
}

+static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, int key)
+{
+ switch (key) {
+ case K_TIMER: {
+ struct hist_browser_timer *hbt = browser->hbt;
+ u64 nr_entries;
+
+ WARN_ON_ONCE(!hbt);
+
+ if (hbt)
+ hbt->timer(hbt->arg);
+
+ if (hist_browser__has_filter(browser) || symbol_conf.report_hierarchy)
+ hist_browser__update_nr_entries(browser);
+
+ nr_entries = hist_browser__nr_entries(browser);
+ ui_browser__update_nr_entries(&browser->b, nr_entries);
+
+ if (warn_lost_event &&
+ (browser->hists->stats.nr_lost_warned !=
+ browser->hists->stats.nr_events[PERF_RECORD_LOST])) {
+ browser->hists->stats.nr_lost_warned =
+ browser->hists->stats.nr_events[PERF_RECORD_LOST];
+ ui_browser__warn_lost_events(&browser->b);
+ }
+
+ hist_browser__title(browser, title, sizeof(title));
+ ui_browser__show_title(&browser->b, title);
+ break;
+ }
+ case 'D': { /* Debug */
+ struct hist_entry *h = rb_entry(browser->b.top, struct hist_entry, rb_node);
+ static int seq;
+
+ ui_helpline__pop();
+ ui_helpline__fpush("%d: nr_ent=(%d,%d), etl: %d, rows=%d, idx=%d, fve: idx=%d, row_off=%d, nrows=%d",
+ seq++, browser->b.nr_entries, browser->hists->nr_entries,
+ browser->b.extra_title_lines, browser->b.rows,
+ browser->b.index, browser->b.top_idx, h->row_offset, h->nr_rows);
+ }
+ break;
+ case 'C':
+ /* Collapse the whole world. */
+ hist_browser__set_folding(browser, false);
+ break;
+ case 'c':
+ /* Collapse the selected entry. */
+ hist_browser__set_folding_selected(browser, false);
+ break;
+ case 'E':
+ /* Expand the whole world. */
+ hist_browser__set_folding(browser, true);
+ break;
+ case 'e':
+ /* Expand the selected entry. */
+ hist_browser__set_folding_selected(browser, true);
+ break;
+ case 'H':
+ browser->show_headers = !browser->show_headers;
+ hist_browser__update_rows(browser);
+ break;
+ case '+':
+ if (hist_browser__toggle_fold(browser))
+ break;
+ /* fall thru */
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
int hist_browser__run(struct hist_browser *browser, const char *help,
- bool warn_lost_event)
+ bool warn_lost_event, int key)
{
- int key;
char title[160];
struct hist_browser_timer *hbt = browser->hbt;
int delay_secs = hbt ? hbt->refresh : 0;
@@ -688,79 +759,14 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
if (ui_browser__show(&browser->b, title, "%s", help) < 0)
return -1;

+ if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+ goto out;
+
while (1) {
key = ui_browser__run(&browser->b, delay_secs);

- switch (key) {
- case K_TIMER: {
- u64 nr_entries;
-
- WARN_ON_ONCE(!hbt);
-
- if (hbt)
- hbt->timer(hbt->arg);
-
- if (hist_browser__has_filter(browser) ||
- symbol_conf.report_hierarchy)
- hist_browser__update_nr_entries(browser);
-
- nr_entries = hist_browser__nr_entries(browser);
- ui_browser__update_nr_entries(&browser->b, nr_entries);
-
- if (warn_lost_event &&
- (browser->hists->stats.nr_lost_warned !=
- browser->hists->stats.nr_events[PERF_RECORD_LOST])) {
- browser->hists->stats.nr_lost_warned =
- browser->hists->stats.nr_events[PERF_RECORD_LOST];
- ui_browser__warn_lost_events(&browser->b);
- }
-
- hist_browser__title(browser, title, sizeof(title));
- ui_browser__show_title(&browser->b, title);
- continue;
- }
- case 'D': { /* Debug */
- static int seq;
- struct hist_entry *h = rb_entry(browser->b.top,
- struct hist_entry, rb_node);
- ui_helpline__pop();
- ui_helpline__fpush("%d: nr_ent=(%d,%d), etl: %d, rows=%d, idx=%d, fve: idx=%d, row_off=%d, nrows=%d",
- seq++, browser->b.nr_entries,
- browser->hists->nr_entries,
- browser->b.extra_title_lines,
- browser->b.rows,
- browser->b.index,
- browser->b.top_idx,
- h->row_offset, h->nr_rows);
- }
- break;
- case 'C':
- /* Collapse the whole world. */
- hist_browser__set_folding(browser, false);
- break;
- case 'c':
- /* Collapse the selected entry. */
- hist_browser__set_folding_selected(browser, false);
- break;
- case 'E':
- /* Expand the whole world. */
- hist_browser__set_folding(browser, true);
+ if (hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
break;
- case 'e':
- /* Expand the selected entry. */
- hist_browser__set_folding_selected(browser, true);
- break;
- case 'H':
- browser->show_headers = !browser->show_headers;
- hist_browser__update_rows(browser);
- break;
- case '+':
- if (hist_browser__toggle_fold(browser))
- break;
- /* fall thru */
- default:
- goto out;
- }
}
out:
ui_browser__hide(&browser->b);
@@ -2994,8 +3000,7 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,

nr_options = 0;

- key = hist_browser__run(browser, helpline,
- warn_lost_event);
+ key = hist_browser__run(browser, helpline, warn_lost_event, 0);

if (browser->he_selection != NULL) {
thread = hist_browser__selected_thread(browser);
@@ -3573,7 +3578,7 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
memset(&action, 0, sizeof(action));

while (1) {
- key = hist_browser__run(browser, "? - help", true);
+ key = hist_browser__run(browser, "? - help", true, 0);

switch (key) {
case 'q':
diff --git a/tools/perf/ui/browsers/hists.h b/tools/perf/ui/browsers/hists.h
index 078f2f2c7abd..1e938d9ffa5e 100644
--- a/tools/perf/ui/browsers/hists.h
+++ b/tools/perf/ui/browsers/hists.h
@@ -34,7 +34,7 @@ struct hist_browser {
struct hist_browser *hist_browser__new(struct hists *hists);
void hist_browser__delete(struct hist_browser *browser);
int hist_browser__run(struct hist_browser *browser, const char *help,
- bool warn_lost_event);
+ bool warn_lost_event, int key);
void hist_browser__init(struct hist_browser *browser,
struct hists *hists);
#endif /* _PERF_UI_BROWSER_HISTS_H_ */