Shailabh Nagar wrote:
The following patches add accounting for the delays seen by tasks in
a) waiting for a CPU (while being runnable)
b) completion of synchronous block I/O initiated by the task
c) swapping in pages (i.e. capacity misses).
Such delays provide feedback for a task's cpu priority, io priority and
rss limit values. Long delays, especially relative to other tasks, can
be a trigger for changing a task's cpu/io priorities and modifying its
rss usage (either directly through sys_getprlimit() that was proposed
earlier on lkml or by throttling cpu consumption or process calling
sys_setrlimit etc.)
Can we get an idea about the actual userspace programs and algorithms
that use this feedback? Links, performance numbers, etc.
--
SUSE Labs, Novell Inc.
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