From 4b6c0e31385f5f27a151088c0a2b614495c4e589 Mon Sep 17 00:00:00 2001 From: Paul Duncan Date: Thu, 14 Oct 2021 12:47:50 -0400 Subject: initial commit, including theme --- content/posts/2002-02-19-priority-inversion.html | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 content/posts/2002-02-19-priority-inversion.html (limited to 'content/posts/2002-02-19-priority-inversion.html') diff --git a/content/posts/2002-02-19-priority-inversion.html b/content/posts/2002-02-19-priority-inversion.html new file mode 100644 index 0000000..fa8a811 --- /dev/null +++ b/content/posts/2002-02-19-priority-inversion.html @@ -0,0 +1,21 @@ +--- +date: "2002-02-19T15:36:26Z" +title: Priority Inversion +--- + +

+An amusing example of a lack of proper priority inversion handling from the LKML: +

+ +

+ +One mainframe at MIT +was decomissioned in the early 70's and they found a "run only when idle" +task that had been started around seven years earlier and still hadn't gotten +any time slices because the server had never been completely idle. (The +pathfinder mars probe kept rebooting for a similar reason: a vital system +task was getting starved while it held a semaphore that other stuff needed, +and not scheduling before timeouts caused a reboot. + +

+ -- cgit v1.2.3