[PATCH] Zone reclaim: resurrect may_swap
Zone reclaim has a huge impact on NUMA performance (f.e. our maximum throughput with XFS is raised from 4GB to 6GB/sec / page cache contamination of numa nodes destroys locality if one just does a large copy operation which results in performance dropping for good until reboot). This patch: Resurrect may_swap in struct scan_control Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -71,6 +71,9 @@ struct scan_control {
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int may_writepage;
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/* Can pages be swapped as part of reclaim? */
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int may_swap;
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/* This context's SWAP_CLUSTER_MAX. If freeing memory for
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* suspend, we effectively ignore SWAP_CLUSTER_MAX.
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* In this context, it doesn't matter that we scan the
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@ -458,6 +461,8 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
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* Try to allocate it some swap space here.
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*/
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if (PageAnon(page) && !PageSwapCache(page)) {
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if (!sc->may_swap)
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goto keep_locked;
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if (!add_to_swap(page, GFP_ATOMIC))
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goto activate_locked;
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}
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@ -1166,6 +1171,7 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
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sc.gfp_mask = gfp_mask;
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sc.may_writepage = 0;
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sc.may_swap = 1;
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inc_page_state(allocstall);
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@ -1268,6 +1274,7 @@ loop_again:
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total_reclaimed = 0;
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sc.gfp_mask = GFP_KERNEL;
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sc.may_writepage = 0;
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sc.may_swap = 1;
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sc.nr_mapped = read_page_state(nr_mapped);
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inc_page_state(pageoutrun);
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