On Mon, 14 Jun 2010 12:17:49 +0100 Mel Gorman <mel@xxxxxxxxx> wrote: > shrink_inactive_list() sets up a pagevec to release unfreeable pages. It > uses significant amounts of stack doing this. This patch splits > shrink_inactive_list() to take the stack usage out of the main path so > that callers to writepage() do not contain an unused pagevec on the > stack. You can get the entire pagevec off the stack - just make it a static-to-shrink_inactive_list() pagevec-per-cpu. Locking just requires pinning to a CPU. We could trivially co-opt shrink_inactive_list()'s spin_lock_irq() for that, but pagevec_release() can be relatively expensive so it'd be sad to move that inside spin_lock_irq(). It'd be better to slap a get_cpu()/put_cpu() around the whole thing. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
