linux-kernel - Re: [v2] fadvise: perform WILLNEED readahead asynchronously

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <50EE8B6B.1050204@gmail.com>
Date:	Thu, 10 Jan 2013 10:35:39 +0100
From:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
To:	Eric Wong <normalperson@...t.net>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dave Chinner <david@...morbit.com>,
	Zheng Liu <gnehzuil.liu@...il.com>
Subject: Re: [v2] fadvise: perform WILLNEED readahead asynchronously

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/