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Date: Sun, 23 Jun 2013 11:32:50 +0200 From: Ingo Molnar <mingo@...nel.org> To: Nathan Zimmer <nzimmer@....com> Cc: holt@....com, travis@....com, rob@...dley.net, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, yinghai@...nel.org, akpm@...ux-foundation.org, gregkh@...uxfoundation.org, x86@...nel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [RFC 2/2] x86_64, mm: Reinsert the absent memory * Ingo Molnar <mingo@...nel.org> wrote: > Yet another thing to consider would be to implement an initialization > speedup of 3 orders of magnitude: initialize on the large page (2MB) > grandularity and on-demand delay the initialization of the 4K granular > struct pages [but still allocating them] - which I suspect are a good > chunk of the overhead? That way we could initialize in 2MB steps and speed > up the 2 hours bootup of 32 TB of RAM to 14 seconds... > > [ The cost would be one more branch in the buddy allocator, to detect > not-yet-initialized 2 MB chunks as we encounter them. Acceptable I > think. ] One advantage of this scheme would be that we could use it on pretty much any box, it would provide instant boot time speedups everywhere [a couple of hundred msecs on a small 4GB box - significant I think] - and would spread out and parallelize initialization to later stages. Thanks, Ingo -- 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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