linux-kernel - Re: [RFC 0/6] the big khugepaged redesign

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Message-ID: <20150305170752.GS30405@awork2.anarazel.de>
Date:	Thu, 5 Mar 2015 18:07:52 +0100
From:	Andres Freund <andres@...razel.de>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <dave@...olabs.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	Ebru Akagunduz <ebru.akagunduz@...il.com>,
	Alex Thorlton <athorlton@....com>,
	David Rientjes <rientjes@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Robert Haas <robertmhaas@...il.com>,
	Josh Berkus <josh@...iodbs.com>
Subject: Re: [RFC 0/6] the big khugepaged redesign

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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