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[[!tag open_issue_gnumach open_issue_hurd]]
IRC, #hurd, freenode, 2011-02-13:
<etenil> youpi: Would libdiskfs/diskfs.h be in the right place to make
readahead functions?
<youpi> etenil: no, it'd rather be at the memory management layer,
i.e. mach, unfortunately
<youpi> because that's where you see the page faults
<etenil> youpi: Linux also provides a readahead() function for higher level
applications. I'll probably have to add the same thing in a place that's
higher level than mach
<youpi> well, that should just be hooked to the same common implementation
<etenil> the man page for readahead() also states that portable
applications should avoid it, but it could be benefic to have it for
portability
<youpi> it's not in posix indeed
IRC, #hurd, freenode, 2011-02-14:
<etenil> youpi: I've investigated prefetching (readahead) techniques. One
called DiskSeen seems really efficient. I can't tell yet if it's patented
etc. but I'll keep you informed
<youpi> don't bother with complicated techniques, even the most simple ones
will be plenty :)
<etenil> it's not complicated really
<youpi> the matter is more about how to plug it into mach
<etenil> ok
<youpi> then don't bother with potential pattents
<antrik> etenil: please take a look at the work KAM did for last year's
GSoC
<youpi> just use a trivial technique :)
<etenil> ok, i'll just go the easy way then
<braunr> antrik: what was etenil referring to when talking about
prefetching ?
<braunr> oh, madvise() stuff
<braunr> i could help him with that
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