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authorStefan Raspl <raspl@linux.vnet.ibm.com>2017-03-10 13:40:06 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2017-03-29 12:01:27 +0200
commit184b2d23b057b35fba7fd4049962a897ef0e3f9d (patch)
treebac84a46b31f5eb514288408cb5f6882f6399e0a /tools/kvm
parent692c7f6deb553dde2531102cd10ac17ab61438e4 (diff)
tools/kvm_stat: reduce perceived idle time on filter updates
Whenever a user adds a filter, we * redraw the header immediately for a snappy response * print a message indicating to the user that we're busy while the noticeable delay induced by updating all of the stats objects takes place * update the statistics ASAP (i.e. after 0.25s instead of 3s) to be consistent with behavior on startup To do so, we split the Tui's refresh() method to allow for drawing header and stats separately, and trigger a header refresh whenever we are about to do something that takes a while - like updating filters. Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'tools/kvm')
-rwxr-xr-xtools/kvm/kvm_stat/kvm_stat48
1 files changed, 30 insertions, 18 deletions
diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 5c4f24879dc4..3e60d93870c0 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -801,6 +801,8 @@ class Stats(object):
LABEL_WIDTH = 40
NUMBER_WIDTH = 10
+DELAY_INITIAL = 0.25
+DELAY_REGULAR = 3.0
class Tui(object):
@@ -856,13 +858,14 @@ class Tui(object):
"""Propagates pid selection to stats object."""
self.stats.pid_filter = pid
- def refresh(self, sleeptime):
- """Refreshes on-screen data."""
+ def refresh_header(self, pid=None):
+ """Refreshes the header."""
+ if pid is None:
+ pid = self.stats.pid_filter
self.screen.erase()
- if self.stats.pid_filter > 0:
+ if pid > 0:
self.screen.addstr(0, 0, 'kvm statistics - pid {0}'
- .format(self.stats.pid_filter),
- curses.A_BOLD)
+ .format(pid), curses.A_BOLD)
else:
self.screen.addstr(0, 0, 'kvm statistics - summary', curses.A_BOLD)
self.screen.addstr(2, 1, 'Event')
@@ -870,7 +873,13 @@ class Tui(object):
len('Total'), 'Total')
self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 8 -
len('Current'), 'Current')
+ self.screen.addstr(4, 1, 'Collecting data...')
+ self.screen.refresh()
+
+ def refresh_body(self, sleeptime):
row = 3
+ self.screen.move(row, 0)
+ self.screen.clrtobot()
stats = self.stats.get()
def sortkey(x):
@@ -914,10 +923,12 @@ class Tui(object):
regex = self.screen.getstr()
curses.noecho()
if len(regex) == 0:
+ self.refresh_header()
return
try:
re.compile(regex)
self.stats.fields_filter = regex
+ self.refresh_header()
return
except re.error:
continue
@@ -944,37 +955,38 @@ class Tui(object):
try:
pid = int(pid)
-
- if pid == 0:
- self.update_pid(pid)
- break
- else:
- if not os.path.isdir(os.path.join('/proc/', str(pid))):
- continue
- else:
- self.update_pid(pid)
- break
+ if pid != 0 and not os.path.isdir(os.path.join('/proc/',
+ str(pid))):
+ continue
+ self.refresh_header(pid)
+ self.update_pid(pid)
+ break
except ValueError:
continue
def show_stats(self):
"""Refreshes the screen and processes user input."""
- sleeptime = 0.25
+ sleeptime = DELAY_INITIAL
+ self.refresh_header()
while True:
- self.refresh(sleeptime)
+ self.refresh_body(sleeptime)
curses.halfdelay(int(sleeptime * 10))
- sleeptime = 3.0
+ sleeptime = DELAY_REGULAR
try:
char = self.screen.getkey()
if char == 'x':
+ self.refresh_header()
self.update_drilldown()
+ sleeptime = DELAY_INITIAL
if char == 'q':
break
if char == 'f':
self.show_filter_selection()
+ sleeptime = DELAY_INITIAL
if char == 'p':
self.show_vm_selection()
+ sleeptime = DELAY_INITIAL
except KeyboardInterrupt:
break
except curses.error: