Nick Piggin wrote:
Rik van Riel wrote:
We apply pressure to each of sets of the pageout queues based on: - the size of each queue - the fraction of recently referenced pages in each queue, not counting used-once file pages - swappiness (file IO is more efficient than swap IO)
This ignores whether a file page is mapped, doesn't it?
Even so, it could be a good approach anyway.
It does, but once it gets the file list down to the size where it finds that a fair number of the pages were referenced, it will back off the pressure automatically. Also, we do not apply the used-once algorithm to mapped pages, meaning that mapped pages with the accessed bit set always get rotated back onto the active list, while unmapped pages do not.
There are a couple of little nice improvements you have there, such as treating shmem pages in the same class as anon pages. We found that we needed something similar, so some of those things should go upstream on their own.
It will be hard to merge that "on its own" without the split queues. I can't really think of a good way to split this patch up into multiple functional bits... -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
