mm/compaction: correct the comments of compact_defer_shift
There is no compact_defer_limit. It should be compact_defer_shift in use. and add compact_order_failed explanation. Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Link: http://lkml.kernel.org/r/3bd60e1b-a74e-050d-ade4-6e8f54e00b92@linux.alibaba.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -536,6 +536,7 @@ struct zone {
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* On compaction failure, 1<<compact_defer_shift compactions
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* are skipped before trying again. The number attempted since
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* last failure is tracked with compact_considered.
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* compact_order_failed is the minimum compaction failed order.
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*/
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unsigned int compact_considered;
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unsigned int compact_defer_shift;
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@ -154,7 +154,7 @@ EXPORT_SYMBOL(__ClearPageMovable);
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/*
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* Compaction is deferred when compaction fails to result in a page
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* allocation success. 1 << compact_defer_limit compactions are skipped up
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* allocation success. 1 << compact_defer_shift, compactions are skipped up
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* to a limit of 1 << COMPACT_MAX_DEFER_SHIFT
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*/
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void defer_compaction(struct zone *zone, int order)
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