Messages in this thread Patch in this message | | | From | Con Kolivas <> | Subject | [PATCH] mm: yield during swap prefetching | Date | Wed, 8 Mar 2006 10:13:44 +1100 |
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Swap prefetching doesn't use very much cpu but spends a lot of time waiting on disk in uninterruptible sleep. This means it won't get preempted often even at a low nice level since it is seen as sleeping most of the time. We want to minimise its cpu impact so yield where possible.
Signed-off-by: Con Kolivas <kernel@kolivas.org> --- mm/swap_prefetch.c | 1 + 1 file changed, 1 insertion(+)
Index: linux-2.6.15-ck5/mm/swap_prefetch.c =================================================================== --- linux-2.6.15-ck5.orig/mm/swap_prefetch.c 2006-03-02 14:00:46.000000000 +1100 +++ linux-2.6.15-ck5/mm/swap_prefetch.c 2006-03-08 08:49:32.000000000 +1100 @@ -421,6 +421,7 @@ static enum trickle_return trickle_swap( if (trickle_swap_cache_async(swp_entry, node) == TRICKLE_DELAY) break; + yield(); } if (sp_stat.prefetched_pages) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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