From: Andi Kleen <andi@firstfloor.org>
To: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <ak@linux.intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
Rik van Riel <riel@redhat.com>, Hillf Danton <dhillf@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting
Date: Fri, 12 Apr 2013 17:22:37 +0200 [thread overview]
Message-ID: <20130412152237.GM16732@two.firstfloor.org> (raw)
In-Reply-To: <20130411232907.GC29398@hacker.(null)>
On Fri, Apr 12, 2013 at 07:29:07AM +0800, Wanpeng Li wrote:
> Ping Andi,
> On Thu, Apr 04, 2013 at 05:09:08PM +0800, Wanpeng Li wrote:
> >order >= MAX_ORDER pages are only allocated at boot stage using the
> >bootmem allocator with the "hugepages=xxx" option. These pages are never
> >free after boot by default since it would be a one-way street(>= MAX_ORDER
> >pages cannot be allocated later), but if administrator confirm not to
> >use these gigantic pages any more, these pinned pages will waste memory
> >since other users can't grab free pages from gigantic hugetlb pool even
> >if OOM, it's not flexible. The patchset add hugetlb gigantic page pools
> >shrink supporting. Administrator can enable knob exported in sysctl to
> >permit to shrink gigantic hugetlb pool.
I originally didn't allow this because it's only one way and it seemed
dubious. I've been recently working on a new patchkit to allocate
GB pages from CMA. With that freeing actually makes sense, as
the pages can be reallocated.
-Andi
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next prev parent reply other threads:[~2013-04-12 15:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 9:09 [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting Wanpeng Li
2013-04-04 9:09 ` [PATCH 1/6] mm/hugetlb: introduce new sysctl knob which control gigantic page pools shrinking Wanpeng Li
2013-04-04 9:09 ` [PATCH 2/6] mm/hugetlb: update_and_free_page gigantic pages awareness Wanpeng Li
2013-04-04 9:09 ` [PATCH 3/6] mm/hugetlb: enable gigantic hugetlb page pools shrinking Wanpeng Li
2013-04-04 9:09 ` [PATCH 4/6] mm/hugetlb: use already exist huge_page_order() instead of h->order Wanpeng Li
2013-04-04 9:09 ` [PATCH 5/6] mm/hugetlb: remove redundant hugetlb_prefault Wanpeng Li
2013-04-04 9:09 ` [PATCH 6/6] mm/hugetlb: use already exist interface huge_page_shift Wanpeng Li
2013-04-04 16:17 ` [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting Michal Hocko
2013-04-04 16:20 ` Michal Hocko
2013-04-05 1:29 ` Wanpeng Li
2013-04-05 1:29 ` Wanpeng Li
2013-04-04 23:41 ` Wanpeng Li
2013-04-04 23:41 ` Wanpeng Li
2013-04-05 8:12 ` Michal Hocko
2013-04-05 8:27 ` Wanpeng Li
2013-04-05 8:27 ` Wanpeng Li
2013-04-05 9:27 ` Michal Hocko
2013-04-05 8:54 ` Simon Jeons
2013-04-05 9:52 ` Michal Hocko
2013-04-04 23:35 ` Wanpeng Li
2013-04-04 23:35 ` Wanpeng Li
2013-04-11 23:29 ` Wanpeng Li
2013-04-11 23:29 ` Wanpeng Li
2013-04-12 15:22 ` Andi Kleen [this message]
2013-07-15 11:31 ` Wanpeng Li
2013-07-15 11:31 ` Wanpeng Li
2014-08-21 23:37 ` Wanpeng Li
2014-08-22 1:34 ` Zhang Yanfei
2014-08-22 4:04 ` Wanpeng Li
2014-08-22 14:18 ` Andi Kleen
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