| To: | Daniel Walker <dwalker@xxxxxxxxxx> |
|---|---|
| Subject: | Re: RT and XFS |
| From: | Bill Huey (hui) <bhuey@xxxxxxxx> |
| Date: | Mon, 18 Jul 2005 20:31:32 -0700 |
| Cc: | Ingo Molnar <mingo@xxxxxxx>, Dave Chinner <dgc@xxxxxxx>, Nathan Scott <nathans@xxxxxxx>, Steve Lord <lord@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx> |
| In-reply-to: | <1121444215.19554.18.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| References: | <1121209293.26644.8.camel@xxxxxxxxxxxxxxxxxx> <20050713002556.GA980@frodo> <20050713064739.GD12661@xxxxxxx> <1121273158.13259.9.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20050714002246.GA937@frodo> <20050714135023.E241419@xxxxxxxxxxxxxxxxx> <1121314226.14816.18.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20050715102311.GA5302@xxxxxxx> <1121444215.19554.18.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| Sender: | linux-xfs-bounce@xxxxxxxxxxx |
| User-agent: | Mutt/1.5.9i |
On Fri, Jul 15, 2005 at 09:16:55AM -0700, Daniel Walker wrote: > I don't agree with that. But of course I'm always speaking from a real > time perspective . PI is expensive , but it won't always be. However, no > one is forcing PI on anyone, even if I think it's good .. It depends on what kind of PI under specific circumstances. In the general kernel, it's really to be avoided at all costs since it's masking a general contention problem at those places. In a formally provable worst case system using priority ceiling emulation and stuff, PI really valuable. How a system like the Linux kernel fits into that is a totally different story. General purpose kernels using general purpose facilities don't. That's how I see it. bill |
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