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SubjectRe: POSIX_FADV_DONTNEED
On Thu, 14 Aug 2008 12:26:28 +0200 "Trevor Woollacott [ MTN - Innovation Centre ]" <Woolla_T@mtn.co.za> wrote:

>
> > On Fri, 1 Aug 2008 17:05:39 +0200 "Trevor Woollacott [ MTN - Innovation
> > Centre ]" <Woolla_T@mtn.co.za> wrote:

(please don't top-post).

> > >
> > > Hi all
> > >
> > > Does anyone know if posix_fadvise() with POSIX_FADV_DONTNEED is
> > > blocking/unblocking?
> >
> > It tries to be nonblocking and will mostly succeed in that. It might
> > occasionally block on a metadata read or journal congestion or
> > something, so it isn't guaranteed.
> >
>
> Thanks for the response Andrew. Is there a way to check when the cached
> data has been freed after fadvise has been called?
>

I assume you meant "whether", not "when".

Not directly. I believe that the best way of obtaining that
information remains mmap()ing the file then querying the presence of
pages via mincore().


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