From: Eric Wong <normalperson@yhbt.net>
To: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Dave Chinner <david@fromorbit.com>,
Zheng Liu <gnehzuil.liu@gmail.com>
Subject: Re: [v2] fadvise: perform WILLNEED readahead asynchronously
Date: Thu, 10 Jan 2013 11:14:03 +0000 [thread overview]
Message-ID: <20130110111403.GA730@dcvr.yhbt.net> (raw)
In-Reply-To: <50EE8B6B.1050204@gmail.com>
Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com> wrote:
> Hello,
>
> Il 25/12/2012 03:22, Eric Wong ha scritto:
> > Any other (Free Software) applications that might benefit from
> > lower FADV_WILLNEED latency?
>
> Not with fadvise but with madvise. Libreoffice / Openoffice.org have
> this comment:
>
> // On Linux, madvise(..., MADV_WILLNEED) appears to have the undesirable
> // effect of not returning until the data has actually been paged in, so
> // that its net effect would typically be to slow down the process
> // (which could start processing at the beginning of the data while the
> // OS simultaneously pages in the rest); on other platforms, it remains
> // to be evaluated whether madvise or equivalent is available and
> // actually useful:
>
> See:
> http://cgit.freedesktop.org/libreoffice/core/tree/sal/osl/unx/file.cxx#n1213
>
> May the same approach be extended to madvise MADV_WILLNEED?
Definitely yes, it should be easy. This project low-priority for me at
the moment, if you or anybody else wants to take a stab at it,
please do :)
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prev parent reply other threads:[~2013-01-10 11:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-25 2:22 [PATCH v2] " Eric Wong
2012-12-27 7:01 ` Zheng Liu
2013-01-05 11:46 ` Simon Jeons
2013-01-10 4:05 ` Eric Wong
2013-01-10 9:35 ` [v2] " Riccardo Magliocchetti
2013-01-10 11:14 ` Eric Wong [this message]
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