From: Andrew Morton <akpm@linux-foundation.org>
To: "Trevor Woollacott [ MTN - Innovation Centre ]" <Woolla_T@mtn.co.za>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: POSIX_FADV_DONTNEED
Date: Thu, 14 Aug 2008 09:15:21 -0700 [thread overview]
Message-ID: <20080814091521.e4d9be53.akpm@linux-foundation.org> (raw)
In-Reply-To: <70D00C33FCD1FD4A860DEAC228277C0C048425EA@MTNMAIL1.mtn.co.za>
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().
next prev parent reply other threads:[~2008-08-14 16:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-01 15:05 POSIX_FADV_DONTNEED Trevor Woollacott [ MTN - Innovation Centre ]
2008-08-14 9:17 ` POSIX_FADV_DONTNEED Andrew Morton
2008-08-14 10:26 ` POSIX_FADV_DONTNEED Trevor Woollacott [ MTN - Innovation Centre ]
2008-08-14 16:15 ` Andrew Morton [this message]
2008-08-15 8:23 ` POSIX_FADV_DONTNEED Trevor Woollacott [ MTN - Innovation Centre ]
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