Messages in this thread | | | Date | Thu, 28 Aug 2003 14:00:44 +0100 | From | Jamie Lokier <> | Subject | Re: Lockless file reading |
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Nagendra Singh Tomar wrote: > While the write had "12" in its buffers and it would have grabbed the > page lock to write it into the page cache, won't it set some flag saying > that I don't want to be prempted now. I think there is a small primitive > for it in from 2.5 onwards. I don't think it will be a good idea to prempt > while it is holding the page lock. How is it possible that it just wrote > "1" and did not write "2" though it had grabbed the page lock for that > purpose.
Nope. I don't see any disabling of preemption while the page is held.
It wouldn't make sense anyway, because the copies to/from userspace can sleep, so there's nothing to gain by disabling preemption.
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