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SubjectRe: [PATCH][2.6-mm] Readahead issues and AIO read speedup
Date
On Thursday 07 August 2003 10:39 am, Andrew Morton wrote:
> Badari Pulavarty <pbadari@us.ibm.com> wrote:
> > We should do readahead of actual pages required by the current
> > read would be correct solution. (like Suparna suggested).
>
> I repeat: what will be the effect of this if all those pages are already in
> pagecache?

Hmm !! Do you think just peeking at pagecache and bailing out if
nothing needed to be done, is too expensive ? Anyway, slow read
code has to do this later. Doing it in readahead one more time causes
significant perf. hit ? And also, do you think this is the most common
case ?


Thanks,
Badari
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