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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-11-16 22:30:27 +0100
committerIngo Molnar <mingo@elte.hu>2009-11-17 07:19:53 +0100
commit3b6ed98895b0fccd8c387f3fc44016fb922c0658 (patch)
tree63b6af491b245af1b8051959cb42d45c5bc95ada /tools/perf/builtin-top.c
parentperf tools: Don't die in perf_header_attr__new() (diff)
downloadlinux-3b6ed98895b0fccd8c387f3fc44016fb922c0658.tar.xz
linux-3b6ed98895b0fccd8c387f3fc44016fb922c0658.zip
perf top: Use all the lines in the screen
By querying the current number of rows, if the user specifies the number of entries, use that instead. If the user uses the 'e' command to change the number of lines 0 will mean do it automatically, any other number disables the auto resizing. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <1258407027-384-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-top.c')
-rw-r--r--tools/perf/builtin-top.c42
1 files changed, 41 insertions, 1 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 6613f988a33e..3af95203208a 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -60,7 +60,7 @@ static int system_wide = 0;
static int default_interval = 0;
static int count_filter = 5;
-static int print_entries = 15;
+static int print_entries;
static int target_pid = -1;
static int inherit = 0;
@@ -115,6 +115,36 @@ struct sym_entry {
* Source functions
*/
+/* most GUI terminals set LINES (although some don't export it) */
+static int term_rows(void)
+{
+ char *lines_string = getenv("LINES");
+ int n_lines;
+
+ if (lines_string && (n_lines = atoi(lines_string)) > 0)
+ return n_lines;
+#ifdef TIOCGWINSZ
+ else {
+ struct winsize ws;
+ if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_row)
+ return ws.ws_row;
+ }
+#endif
+ return 25;
+}
+
+static void update_print_entries(void)
+{
+ print_entries = term_rows();
+ if (print_entries > 9)
+ print_entries -= 9;
+}
+
+static void sig_winch_handler(int sig __used)
+{
+ update_print_entries();
+}
+
static void parse_source(struct sym_entry *syme)
{
struct symbol *sym;
@@ -668,6 +698,11 @@ static void handle_keypress(int c)
break;
case 'e':
prompt_integer(&print_entries, "Enter display entries (lines)");
+ if (print_entries == 0) {
+ update_print_entries();
+ signal(SIGWINCH, sig_winch_handler);
+ } else
+ signal(SIGWINCH, SIG_DFL);
break;
case 'E':
if (nr_counters > 1) {
@@ -1228,5 +1263,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (target_pid != -1 || profile_cpu != -1)
nr_cpus = 1;
+ if (print_entries == 0) {
+ update_print_entries();
+ signal(SIGWINCH, sig_winch_handler);
+ }
+
return __cmd_top();
}