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title: Show Processes Doing Polling Operations
name: timeout.stp
version: 1.0
author: Uli Drepper and William Cohen
keywords: profiling
subsystem: kernel
status: production
exit: user-controlled
output: sorted-list
scope: system-wide
description: The timeout.stp script is based on a blog entry (http://udrepper.livejournal.com/19041.html) mentioning a need for a tool to help developers find applications that are polling. The timeout.stp script monitors systemcall used for polling and records the systemcalls that timed out rather than returned because some action occurred. The script updates the screen once a second with the top twenty processes.
test_check: stap -p4 timeout.stp
test_installcheck: stap timeout.stp -c "sleep 0.2"
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