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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/
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