From: Michal Hocko <mhocko@kernel.org>
To: Paul Cassella <cassella@cray.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
linux-mm@kvack.org
Subject: Re: hugetlb: reservation race leading to under provisioning
Date: Mon, 9 Jan 2017 09:58:34 +0100 [thread overview]
Message-ID: <20170109085834.GC7495@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.LNX.2.00.1701061128390.9628@rueplumet.us.cray.com>
On Fri 06-01-17 13:57:59, Paul Cassella wrote:
> On Fri, 6 Jan 2017, Michal Hocko wrote:
> > On Thu 05-01-17 16:48:03, Mike Kravetz wrote:
> > > On 01/05/2017 07:15 AM, Michal Hocko wrote:
>
> > > > we have a customer report on an older kernel (3.12) but I believe the
> > > > same issue is present in the current vanilla kernel. There is a race
> > > > between mmap trying to do a reservation which fails when racing with
> > > > truncate_hugepages. See the reproduced attached.
> > > >
> > > > It should go like this (analysis come from the customer and I hope I
> > > > haven't screwed their write up).
>
> Hi Michal,
>
> There may have been a step missing from what was sent to you, right at the
> point Mike asked about. I've added it below.
No, I guess the info I got from you was complete. I was trying to reduce
the info to the minimum and wasn't explicit about this fact enough
assuming it would be clear from the test case which I forgot to add...
Sorry about that!
--
Michal Hocko
SUSE Labs
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prev parent reply other threads:[~2017-01-09 8:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-05 15:15 Michal Hocko
2017-01-06 0:48 ` Mike Kravetz
2017-01-06 8:58 ` Michal Hocko
2017-01-06 15:01 ` Michal Hocko
2017-01-06 21:57 ` Paul Cassella
2017-01-08 19:08 ` Mike Kravetz
2017-01-09 10:25 ` Michal Hocko
2017-01-09 8:58 ` Michal Hocko [this message]
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