Messages in this thread | | | Date | Mon, 08 Dec 2008 04:02:04 -0800 (PST) | Subject | Re: [patch] Performance Counters for Linux, v2 | From | David Miller <> |
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From: Ingo Molnar <mingo@elte.hu> Date: Mon, 8 Dec 2008 12:33:18 +0100
> Your whole statistical argument that group readout is a must-have for > precision is fundamentally flawed as well: counters _themselves_, as used > by most applications, by their nature, are a statistical sample to begin > with. There's way too many hardware events to track each of them > unintrusively - so this type of instrumentation is _all_ sampling based, > and fundamentally so. (with a few narrow exceptions such as single-event > interrupts for certain rare event types)
There are a lot of people who are going to fundamentally disagree with this, myself included.
A lot of things are being stated about what people do with this stuff, but I think there are people working longer in this area who quite possibly know a lot better. But they were blindsided by this new work instead of being consulted, which was pretty unnice.
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