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perf ui browser: Allow specifying message to show when no samples are available to display

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The 'perf top' tool will use that to avoid having a initial blank screen
while collecting the minimum number of samples to sort and display.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-89ciceg8cy4442he3t0jzo3f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-08-19 16:43:58 -03:00
parent 9b01611934
commit 2284cf8074
2 changed files with 3 additions and 0 deletions
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2
tools/perf/ui/browser.c
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@ -347,6 +347,8 @@ static int __ui_browser__refresh(struct ui_browser *browser)
SLsmg_fill_region(browser->y + row + browser->extra_title_lines, browser->x, SLsmg_fill_region(browser->y + row + browser->extra_title_lines, browser->x,
browser->rows - row, width, ' '); browser->rows - row, width, ' ');
if (browser->nr_entries == 0 && browser->no_samples_msg)
__ui__info_window(NULL, browser->no_samples_msg, NULL);
return 0; return 0;
} }

1
tools/perf/ui/browser.h
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@ -23,6 +23,7 @@ struct ui_browser {
void *priv; void *priv;
const char *title; const char *title;
char *helpline; char *helpline;
const char *no_samples_msg;
void (*refresh_dimensions)(struct ui_browser *browser); void (*refresh_dimensions)(struct ui_browser *browser);
unsigned int (*refresh)(struct ui_browser *browser); unsigned int (*refresh)(struct ui_browser *browser);
void (*write)(struct ui_browser *browser, void *entry, int row); void (*write)(struct ui_browser *browser, void *entry, int row);