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Date: Thu, 5 Mar 2015 18:07:52 +0100
From: Andres Freund <andres@anarazel.de>
Subject: Re: [RFC 0/6] the big khugepaged redesign
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To: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>, Davidlohr Bueso <dave@stgolabs.net>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hugh Dickins <hughd@google.com>, Andrea Arcangeli <aarcange@redhat.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>, Ebru Akagunduz <ebru.akagunduz@gmail.com>, Alex Thorlton <athorlton@sgi.com>, David Rientjes <rientjes@google.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>, Robert Haas <robertmhaas@gmail.com>, Josh Berkus <josh@agliodbs.com>

On 2015-03-05 18:01:08 +0100, Vlastimil Babka wrote:
> On 03/05/2015 05:52 PM, Andres Freund wrote:
> > What exactly counts as "recent" in this context? Most of the bigger
> > installations where we found THP to be absolutely prohibitive (slowdowns
> > on the order of a magnitude, huge latency spikes) unfortunately run
> > quite old kernels...  I guess 3.11 does *not* count :/? That'd be a
> 
> Yeah that's too old :/

Guessed so.

> I also noticed that you now support hugetlbfs. That could be also interesting
> data point, if the hugetlbfs usage helped because THP code wouldn't
> trigger.

Well, mmap(MAP_HUGETLB), but yea.

Will let you know once I know whether it's possible to get a newer kernel.

Greetings,

Andres Freund

-- 
 Andres Freund	                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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