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SubjectRe: readahead on directories
Phillip Susi wrote:
> I have been trying to improve boot times with ureadahead and have
> identified a period of time of almost zero IO throughput caused by calls
> to open() blocking during name lookup while fetching directory blocks.
> At first I thought this could simply be fixed by calling readahead() on
> the directories first before open()ing all of the normal files for
> readahead.
>
> Unfortunately it seems that readahead() fails when called on a
> directory. I was wondering if I could get some help understanding why
> this is, and how it could be fixed.

readahead() doesn't make much sense on a directory - the offset and
size aren't meaningful.

But does plain opendir/readdir/closedir solve the problem?

-- Jamie


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