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List: kde-bugs-dist
Subject: [plasma] [Bug 339545] New: Ktimer can lag when it doesn't get scheduled
From: Christopher Neufeld <kdebugs () cneufeld ! ca>
Date: 2014-09-30 21:52:18
Message-ID: bug-339545-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=339545
Bug ID: 339545
Summary: Ktimer can lag when it doesn't get scheduled
Product: plasma
Version: git master
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: widget-timer
Assignee: plasma-bugs@kde.org
Reporter: kdebugs@cneufeld.ca
I started a Ktimer 30 minutes while doing some work on my machine. Due to
memory pressure, the desktop became entirely unresponsive for about 4 minutes.
The clock stopped, the mouse pointer didn't work, and so on. This happens
occasionally with the work I do.
When the desktop became useable again, the clock applet caught up, but the
ktimer one did not. My timer expired about 4 minutes late.
Reproducible: Didn't try
Steps to Reproduce:
1. Start a timer running
2. Badly overcommit memory, leading to an unresponsive system while swapping is
occuring
3. When the desktop becomes responsive, note that the timer doesn't catch up.
Actual Results:
The timer goes off late, apparently due to it missing ticks.
Expected Results:
The timer should use wall-clock time to keep itself synchronized.
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