Re: [PATCH] schedstat-2.6.0-test5-A1 measuring process scheduling latency

[Peter Chubb]

>>>>> "Rick" == Rick Lindsley <ricklind@xxxxxxxxxx> writes:

PeterC>     An alternative is my microstate accounting patch, which lets
PeterC> you do the same thing (with rather less intrusiveness) but
PeterC> per-thread.

Rick>     [ ... snip ... ]

PeterC>     My own observations tend me to the idea that a process
PeterC> waiting for disk I/O isn't awoken fast enough, at least on my
PeterC> laptop.
    
Rick> I'm not sure that it's any less or more intrusive, but it's at
Rick> least another way of doing the same thing.  So since you've
Rick> taken some measurements, what's the length of time you find your
Rick> process waits to hit the processor after getting the I/O it
Rick> needs?  What's the time it seems to wait when it skips (what's
Rick> the cutoff at which you hear a skip versus don't hear one?)


Graph attached, times in seconds per second.
(BTW, the patch I sent was bad, because I diffed against the wrong
tree.  There's a new patch coming soon)