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    SubjectRe: [PATCH] mm: swap prefetch more improvements
    On Mon, 14 May 2007 10:50:54 +1000
    Con Kolivas <> wrote:

    > akpm, please queue on top of "mm: swap prefetch improvements"
    > ---
    > Failed radix_tree_insert wasn't being handled leaving stale kmem.
    > The list should be iterated over in the reverse order when prefetching.
    > Make the yield within kprefetchd stronger through the use of cond_resched.


    > - might_sleep();
    > - if (!prefetch_suitable())
    > + /* Yield to anything else running */
    > + if (cond_resched() || !prefetch_suitable())
    > goto out_unlocked;

    So if cond_resched() happened to schedule away, we terminate this
    swap-tricking attempt. It's not possible to determine the reasons for this
    from the code or from the changelog (==bad).

    How come?

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