Add new command 's' to modify the update interval. Limited to a maximum of
25.5 sec and a minimum of 0.1 sec, since curses cannot handle longer
and shorter delays respectively.
Signed-off-by: Stefan Raspl <raspl@xxxxxxxxxxxxxxxxxx>
---
tools/kvm/kvm_stat/kvm_stat | 55 +++++++++++++++++++++++++++++++++++------
tools/kvm/kvm_stat/kvm_stat.txt | 2 ++
2 files changed, 49 insertions(+), 8 deletions(-)
diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 6838de38ecb5..1276b88937c0 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -844,8 +844,7 @@ class Stats(object):
self.values[key] = (newval, newdelta)
return self.values
-DELAY_INITIAL = 0.25
-DELAY_REGULAR = 3.0
+DELAY_DEFAULT = 3.0
MAX_GUEST_NAME_LEN = 48
MAX_REGEX_LEN = 44
DEFAULT_REGEX = r'^[^\(]*$'
@@ -856,6 +855,8 @@ class Tui(object):
def __init__(self, stats):
self.stats = stats
self.screen = None
+ self._delay_initial = 0.25
+ self._delay_regular = DELAY_DEFAULT
def __enter__(self):
"""Initialises curses for later use. Based on curses.wrapper
@@ -1027,6 +1028,7 @@ class Tui(object):
' p filter by PID',
' q quit',
' r reset stats',
+ ' s set update interval',
' x toggle reporting of stats for individual child trace'
' events',
'Any other key refreshes statistics immediately')
@@ -1106,10 +1108,41 @@ class Tui(object):
self.refresh_header(pid)
self.update_pid(pid)
break
-
except ValueError:
msg = '"' + str(pid) + '": Not a valid pid'
+ def show_set_update_interval(self):
+ """Draws update interval selection mask."""
+ msg = ''
+ while True:
+ self.screen.erase()
+ self.screen.addstr(0, 0, 'Set update interval (defaults to %fs).' %
+ DELAY_DEFAULT, curses.A_BOLD)
+ self.screen.addstr(4, 0, msg)
+ self.screen.addstr(2, 0, 'Change delay from %.1fs to ' %
+ self._delay_regular)
+ curses.echo()
+ val = self.screen.getstr()
+ curses.noecho()
+
+ try:
+ if len(val) > 0:
+ delay = float(val)
+ if delay < 0.1:
+ msg = '"' + str(val) + '": Value must be >=0.1'
+ continue
+ if delay > 25.5:
+ msg = '"' + str(val) + '": Value must be <=25.5'
+ continue
+ else:
+ delay = DELAY_DEFAULT
+ self._delay_regular = delay
+ break
+
+ except ValueError:
+ msg = '"' + str(val) + '": Invalid value'
+ self.refresh_header()
+
def show_vm_selection_by_guest_name(self):
"""Draws guest selection mask.
@@ -1156,14 +1189,14 @@ class Tui(object):
def show_stats(self):
"""Refreshes the screen and processes user input."""
- sleeptime = DELAY_INITIAL
+ sleeptime = self._delay_initial
self.refresh_header()
start = 0.0 # result based on init value never appears on screen
while True:
self.refresh_body(time.time() - start)
curses.halfdelay(int(sleeptime * 10))
start = time.time()
- sleeptime = DELAY_REGULAR
+ sleeptime = self._delay_regular
try:
char = self.screen.getkey()
if char == 'c':
@@ -1174,23 +1207,28 @@ class Tui(object):
curses.curs_set(1)
self.show_filter_selection()
curses.curs_set(0)
- sleeptime = DELAY_INITIAL
+ sleeptime = self._delay_initial
if char == 'g':
curses.curs_set(1)
self.show_vm_selection_by_guest_name()
curses.curs_set(0)
- sleeptime = DELAY_INITIAL
+ sleeptime = self._delay_initial
if char == 'h':
self.show_help_interactive()
if char == 'p':
curses.curs_set(1)
self.show_vm_selection_by_pid()
curses.curs_set(0)
- sleeptime = DELAY_INITIAL
+ sleeptime = self._delay_initial
if char == 'q':
break
if char == 'r':
self.stats.reset()
+ if char == 's':
+ curses.curs_set(1)
+ self.show_set_update_interval()
+ curses.curs_set(0)
+ sleeptime = self._delay_initial
if char == 'x':
self.update_drilldown()
except KeyboardInterrupt:
@@ -1267,6 +1305,7 @@ Interactive Commands:
p filter by PID
q quit
r reset stats
+ s set update interval
x toggle reporting of stats for individual child trace events
Press any other key to refresh statistics immediately.
"""
diff --git a/tools/kvm/kvm_stat/kvm_stat.txt b/tools/kvm/kvm_stat/kvm_stat.txt
index 2bad6f22183b..cc019b09e0f5 100644
--- a/tools/kvm/kvm_stat/kvm_stat.txt
+++ b/tools/kvm/kvm_stat/kvm_stat.txt
@@ -43,6 +43,8 @@ INTERACTIVE COMMANDS
*r*:: reset stats
+*s*:: set update interval
+
*x*:: toggle reporting of stats for child trace events
Press any other key to refresh statistics immediately.
--
2.11.2
