From: Andres Freund <andres@anarazel.de>
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>
Subject: Re: [RFC 0/6] the big khugepaged redesign
Date: Thu, 5 Mar 2015 18:07:52 +0100 [thread overview]
Message-ID: <20150305170752.GS30405@awork2.anarazel.de> (raw)
In-Reply-To: <54F88BD4.3090006@suse.cz>
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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next prev parent reply other threads:[~2015-03-05 17:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-23 12:58 [RFC 0/6] the big khugepaged redesign Vlastimil Babka
2015-02-23 12:58 ` [RFC 1/6] mm, thp: stop preallocating hugepages in khugepaged Vlastimil Babka
2015-02-23 12:58 ` [RFC 2/6] mm, thp: make khugepaged check for THP allocability before scanning Vlastimil Babka
2015-02-23 12:58 ` [RFC 3/6] mm, thp: try fault allocations only if we expect them to succeed Vlastimil Babka
2015-02-23 12:58 ` [RFC 4/6] mm, thp: move collapsing from khugepaged to task_work context Vlastimil Babka
2015-02-23 14:25 ` Peter Zijlstra
2015-02-23 12:58 ` [RFC 5/6] mm, thp: wakeup khugepaged when THP allocation fails Vlastimil Babka
2015-02-23 12:58 ` [RFC 6/6] mm, thp: remove no longer needed khugepaged code Vlastimil Babka
2015-02-23 21:03 ` [RFC 0/6] the big khugepaged redesign Andi Kleen
2015-02-23 22:46 ` Davidlohr Bueso
2015-02-23 22:56 ` Andrew Morton
2015-02-23 22:58 ` Sasha Levin
2015-02-24 10:32 ` Vlastimil Babka
2015-02-24 11:24 ` Andrea Arcangeli
2015-02-24 11:45 ` Andrea Arcangeli
2015-02-25 12:42 ` Vlastimil Babka
2015-03-05 16:30 ` Vlastimil Babka
2015-03-05 16:52 ` Andres Freund
2015-03-05 17:01 ` Vlastimil Babka
2015-03-05 17:07 ` Andres Freund [this message]
2015-03-06 0:21 ` Andres Freund
2015-03-06 7:50 ` Vlastimil Babka
2015-03-09 3:17 ` Vlastimil Babka
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