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Subject: Re: [PATCH 00 of 41] Transparent Hugepage Support #17
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From: Theodore Tso <tytso@MIT.EDU>
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To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Johannes Weiner <hannes@cmpxchg.org>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
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On Apr 6, 2010, at 5:30 AM, Mel Gorman wrote:
>=20
> There is a good chance you could allocate a decent percentage of
> memory as huge pages but as you are unlikely to have run hugeadm
> --set-recommended-min_free_kbytes early in boot, it is also likely to =
trash
> heavily and the success rates will not be very impressive.

Can you explain how hugeadm --set-recommended-min_free_kbytes works and =
how it achieves this magic?  Or can you send me a pointer to how this =
works?   I've tried doing some Google searches, and I found the LWN =
article "Huge pages part 3: administration", but it doesn't go into a =
lot of detail how increasing vm.min_free_kbytes helps the anti =
fragmentation code.

Thanks,

-- Ted

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