I am a Linux kernel developer (working for Red Hat) by day and an anti-spam activist by night. For some values of "day" and "night", of course. In my spare time I hike mountains and play with radios (and radio software).
I am the admin of this wiki, and try to make sure it all runs smoothly.
If you ever run into technical problems with this wiki, please send me an email (firstname.lastname@example.org) and I will fix things.
Rik van Riel
OPW Round 12 small tasks:
Cause the system to swap, and use ftrace and the trace points in mm/page_alloc.c and mm/vmscan.c to determine how long it takes to allocate (and free) pages.
Repeat the same exercise when the system is under heavy filesystem read IO, and when doing lots of filesystem writes (enough to fill up memory).
Use kernelshark to visually examine the observed latencies.
You can email me your ftrace commandlines (or scripts), observations, and questions.