Re: [PATCH 2/2] mm: compaction: Minimise the time IRQs are disabled while isolating pages for migration
From: KAMEZAWA Hiroyuki <hidden>
Date: 2011-02-28 06:00:36
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On Mon, 28 Feb 2011 06:48:18 +0100 Andrea Arcangeli [off-list ref] wrote:
On Mon, Feb 28, 2011 at 11:17:46AM +0900, KAMEZAWA Hiroyuki wrote:quoted
BTW, I forget why we always take zone->lru_lock with IRQ disabled....To decrease lock contention in SMP to deliver overall better performance (not sure how much it helps though). It was supposed to be hold for a very short time (PAGEVEC_SIZE) to avoid giving irq latency problems.
memory hotplug uses MIGRATE_ISOLATED migrate types for scanning pfn range without lru_lock. I wonder whether we can make use of it (the function which memory hotplug may need rework for the compaction but migrate_type can be used, I think). Hmm. -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>