Messages in this thread |  | | Subject | Re: [PATCH] Preemption Latency Measurement Tool | From | Robert Love <> | Date | 19 Sep 2001 22:57:27 -0400 |
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On Wed, 2001-09-19 at 21:13, David Lang wrote: > also how useful is the latency info once swapping starts? if you have > something that gets swapped out it will have horrible latency and skew the > results (or at the very least you won't know if the problem is disk IO or > fixable problems)
Its not that bad because the patch measures latency across points where preemption was enabled and disabled -- the various kernel locking mechanisms.
Thus either page fault holds a lock and it is a legimate latency recorded over that specific lock, or it doesn't in which case its not an issue.
-- Robert M. Love rml at ufl.edu rml at tech9.net
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