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Date: Sat, 19 Jul 2014 12:26:23 +0200 From: Pavel Machek <pavel@....cz> To: Joerg Roedel <joro@...tes.org> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/6] PM / Hibernate: Memory bitmap scalability improvements Hi! > here is a patch set to improve the scalability of the memory > bitmap implementation used for hibernation. The current > implementation does not scale well to machines with several > TB of memory. A resume on those machines may cause soft > lockups to be reported. > > These patches improve the data structure by adding a radix > tree to the linked list structure to improve random access > performance from O(n) to O(log_b(n)), where b depends on the > architecture (b=512 on amd64, 1024 in i386). > > A test on a 12TB machine showed an improvement in resume > time from 76s with the old implementation to 2.4s with the > radix tree and the improved swsusp_free function. See below > for details of this test. Ok, nice. How did space requirements change? In particular, do we need to reserve a bit more pages for hibernation now? Thanks, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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