linux-kernel - RE: POSIX_FADV

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Date:	Fri, 15 Aug 2008 10:23:15 +0200
From:	"Trevor Woollacott [ MTN - Innovation Centre ]" <Woolla_T@....co.za>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: POSIX_FADV_DONTNEED


> On Thu, 14 Aug 2008 12:26:28 +0200 "Trevor Woollacott [ MTN -
Innovation Centre ]" <Woolla_T@....co.za> wrote:
>
> > 
> > > On Fri, 1 Aug 2008 17:05:39 +0200 "Trevor Woollacott [ MTN - 
> > > Innovation Centre ]" <Woolla_T@....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().

Thanks for the advice

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