[3969] in arla-drinkers
Re: is cache-only-prefixes an nnpfs limitation?
daemon@ATHENA.MIT.EDU (Tomas Olsson)
Wed Jun 21 10:19:43 2006
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From: Tomas Olsson <tol@stacken.kth.se>
To: Harald Barth <haba@pdc.kth.se>
Subject: Re: is cache-only-prefixes an nnpfs limitation?
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<20060621.160551.41635819.haba@habarber.pdc.kth.se>
Date: 21 Jun 2006 16:19:33 +0200
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Harald Barth <haba@pdc.kth.se> writes:
> > That means cache eviction of parts of files, and making new holes
> > in files doesn't seem to be widely supported yet.
>
> Yes. When reading a big file, it must be possible to throw away the
> beginning or middle to be able to fit the end in the cache.
>
"Big" steps in linux in this area, btw. They actually added support for
punching holes, but only for tmpfs and shmem IIRC. And only through
sys_madvise(). Maybe more will come, sys_holepunch(fd, start, len) was
mentioned.
Are there any sane interfaces for this in other OS:es?
/t
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