Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 7/13] Drain per-cpu lists when high-order allocations fail | Date | Mon, 10 Sep 2007 12:22:32 +0100 (IST) |
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Subject: Drain per-cpu lists when high-order allocations fail
Per-cpu pages can accidentally cause fragmentation because they are free, but pinned pages in an otherwise contiguous block. When this patch is applied, the per-cpu caches are drained after the direct-reclaim is entered if the requested order is greater than 0. It simply reuses the code used by suspend and hotplug.
Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> ---
mm/page_alloc.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc5-006-group-short-lived-and-reclaimable-kernel-allocations/mm/page_alloc.c linux-2.6.23-rc5-007-drain-per-cpu-lists-when-high-order-allocations-fail/mm/page_alloc.c --- linux-2.6.23-rc5-006-group-short-lived-and-reclaimable-kernel-allocations/mm/page_alloc.c 2007-09-02 16:20:31.000000000 +0100 +++ linux-2.6.23-rc5-007-drain-per-cpu-lists-when-high-order-allocations-fail/mm/page_alloc.c 2007-09-02 16:20:48.000000000 +0100 @@ -852,6 +852,7 @@ void mark_free_pages(struct zone *zone) } spin_unlock_irqrestore(&zone->lock, flags); } +#endif /* CONFIG_PM */ /* * Spill all of this CPU's per-cpu pages back into the buddy allocator. @@ -864,7 +865,25 @@ void drain_local_pages(void) __drain_pages(smp_processor_id()); local_irq_restore(flags); } -#endif /* CONFIG_HIBERNATION */ + +void smp_drain_local_pages(void *arg) +{ + drain_local_pages(); +} + +/* + * Spill all the per-cpu pages from all CPUs back into the buddy allocator + */ +void drain_all_local_pages(void) +{ + unsigned long flags; + + local_irq_save(flags); + __drain_pages(smp_processor_id()); + local_irq_restore(flags); + + smp_call_function(smp_drain_local_pages, NULL, 0, 1); +} /* * Free a 0-order page @@ -1452,6 +1471,9 @@ nofail_alloc: cond_resched(); + if (order != 0) + drain_all_local_pages(); + if (likely(did_some_progress)) { page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags); - 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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