Messages in this thread | | | Date | Thu, 12 Aug 1999 10:35:18 +0200 (MESZ) | From | "Dr. Michael Weller" <> | Subject | Re: clustering page-ins |
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On Wed, 11 Aug 1999, Chuck Lever wrote:
> > so many questions :-) > > don't worry, i probably don't know what i'm talking about anyway... :) > > i'll try to post a patch soon, that will probably explain a little better. > it's pretty simplistic, but i think it will convey my idea.
I didn't try the already posted patches, but if it is not already the case I'd suggest to make the behaviour configurable by madvice, you know:
int madvise(void *addr, size_t len, int behav)
with behaviour like:
MADV_NORMAL The system provides no further special treatment for the memory region. MADV_RANDOM The system expects random page references to that memory region. MADV_SEQUENTIAL The system expects sequential page references to that memory region.
the next are nice, but not as important.
MADV_WILLNEED The system expects the process will need these pages. MADV_DONTNEED The system expects the process does not need these pages. MADV_SPACEAVAIL The system will ensure that memory resources are reserved.
errno values ar EINVAL or ENOSPC for MADV_SPACEAVAIL, it return 0 or -1 for error.
I was told somehow the origins of this function might be BSD, so it might be worthwhile to support. I saw it in many unixes but it is usually documented to have no effect at all.
Michael.
--
Michael Weller: eowmob@exp-math.uni-essen.de, eowmob@ms.exp-math.uni-essen.de, or even mat42b@spi.power.uni-essen.de. If you encounter an eowmob account on any machine in the net, it's very likely it's me.
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