From: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
To: Eric Wong <normalperson@yhbt.net>
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 10:35:39 +0100 [thread overview]
Message-ID: <50EE8B6B.1050204@gmail.com> (raw)
In-Reply-To: <20121225022251.GA25992@dcvr.yhbt.net>
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?
thanks,
riccardo magliocchetti
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WARNING: multiple messages have this Message-ID (diff)
From: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
To: Eric Wong <normalperson@yhbt.net>
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 10:35:39 +0100 [thread overview]
Message-ID: <50EE8B6B.1050204@gmail.com> (raw)
In-Reply-To: <20121225022251.GA25992@dcvr.yhbt.net>
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?
thanks,
riccardo magliocchetti
next prev parent reply other threads:[~2013-01-10 9:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-25 2:22 [PATCH v2] fadvise: perform WILLNEED readahead asynchronously Eric Wong
2012-12-25 2:22 ` Eric Wong
2012-12-27 7:01 ` Zheng Liu
2012-12-27 7:01 ` Zheng Liu
2013-01-05 11:46 ` Simon Jeons
2013-01-05 11:46 ` Simon Jeons
2013-01-10 4:05 ` Eric Wong
2013-01-10 4:05 ` Eric Wong
2013-01-10 9:35 ` Riccardo Magliocchetti [this message]
2013-01-10 9:35 ` [v2] " Riccardo Magliocchetti
2013-01-10 11:14 ` Eric Wong
2013-01-10 11:14 ` Eric Wong
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