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authorVito Caputo <vcaputo@gnugeneration.com>2015-12-07 11:28:18 -0800
committerVito Caputo <vito.caputo@coreos.com>2016-01-12 09:35:17 -0800
commit34b87517749caa4142b19eb3c63bdf349fafbc49 (patch)
tree93a48cb549713e7acdf4c63590b9891f59eb0f78 /rules/.gitignore
parentcf6c8c46fceac83dfb3f2d55fae5220e60841553 (diff)
sd-event: instrument sd_event_run() for profiling delays
Set SD_EVENT_PROFILE_DELAYS to activate accounting and periodic logging of the distribution of delays between sd_event_run() calls. Time spent in dispatching as well as time spent outside of sd_event_run() is measured and accounted for. Every 5 seconds a logarithmic histogram loop iteration delays since 5 seconds previous is logged. This is useful in identifying the frequency and magnitude of latencies affecting the event loop, which should be kept to a minimum.
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