Re: [v2] fadvise: perform WILLNEED readahead asynchronously

[Riccardo Magliocchetti]

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@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/