Date: Thu, 29 Jul 1999 09:48:57 -0700 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: "Daniel C. Sobral" <dcs@newsguy.com>, hackers@FreeBSD.ORG Subject: Re: MADV_SEQUENTIAL and GNU Grep Message-ID: <199907291648.JAA29492@lestat.nas.nasa.gov>
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On Thu, 29 Jul 1999 09:26:12 -0700 (PDT)
Matthew Dillon <dillon@apollo.backplane.com> wrote:
> Yes, it will work. Oops. I do see one problem though... if you do
> this the underlying file object will be marked for sequential operation
> even after the grep (in this case) exits. That is, an madvise() of
> MADV_NORMAL, SEQUENTIAL, or RANDOM appears to have a permanent effect
> on the object. This is probably not correct behavior. We could probably
> fix this by moving this particular flag from the object to the vm_entry.
In NetBSD, we store advice in the map entry, specifically because two
different processes may wish to have different access patterns on the
same object.
Just a data point.
-- Jason R. Thorpe <thorpej@nas.nasa.gov>
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