linux-kernel - Re: POSIX_FADV

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Message-Id: <20080814021703.355b2a76.akpm@linux-foundation.org>
Date:	Thu, 14 Aug 2008 02:17:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Trevor Woollacott [ MTN - Innovation Centre ]" <Woolla_T@....co.za>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: POSIX_FADV_DONTNEED

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

> 
> 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.

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