From: Mel Gorman <mgorman@techsingularity.net>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm, numa: Fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa
Date: Mon, 10 Apr 2017 18:38:49 +0100 [thread overview]
Message-ID: <20170410173849.ecy2ysm7twzgcm53@techsingularity.net> (raw)
In-Reply-To: <20170410135342.GD4618@dhcp22.suse.cz>
On Mon, Apr 10, 2017 at 03:53:42PM +0200, Michal Hocko wrote:
> > While this could be fixed with heavy locking, it's only necessary to
> > make a copy of the PMD on the stack during change_pmd_range and avoid
> > races. A new helper is created for this as the check if quite subtle and the
> > existing similar helpful is not suitable. This passed 154 hours of testing
>
> s@helpful@helper@ I suspect
>
Yes. I'll wait to see if there is more feedback and if not, resend unless
Andrew decides to pick it up and correct the mistake directly.
> > (usually triggers between 20 minutes and 24 hours) without detecting bad
> > PMDs or corruption. A basic test of an autonuma-intensive workload showed
> > no significant change in behaviour.
> >
> > Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> > Cc: stable@vger.kernel.org
>
> Acked-by: Michal Hocko <mhocko@suse.com>
>
Thanks.
> you will probably win the_longest_function_name_contest but I do not
> have much better suggestion.
>
I know, it's not a type of function that yields a snappy name.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2017-04-10 17:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-10 9:48 [PATCH] mm, numa: Fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa Mel Gorman
2017-04-10 10:03 ` Vlastimil Babka
2017-04-10 12:19 ` Mel Gorman
2017-04-10 12:38 ` Rik van Riel
2017-04-10 13:53 ` Michal Hocko
2017-04-10 17:38 ` Mel Gorman [this message]
2017-04-10 16:45 ` Zi Yan
2017-04-10 17:20 ` Mel Gorman
2017-04-10 17:49 ` Zi Yan
2017-04-10 18:07 ` Mel Gorman
2017-04-10 22:09 ` Andrew Morton
2017-04-10 22:28 ` Zi Yan
2017-04-11 6:35 ` Vlastimil Babka
2017-04-11 21:44 ` Andrew Morton
2017-04-11 8:29 ` Mel Gorman
2020-02-16 19:18 [PATCH] mm, numa: fix " Rafael Aquini
2020-02-16 23:32 ` Mel Gorman
2020-03-07 2:40 ` Qian Cai
2020-03-07 3:05 ` Rafael Aquini
2020-03-08 3:20 ` Qian Cai
2020-03-08 23:14 ` Rafael Aquini
2020-03-09 3:27 ` Qian Cai
2020-03-09 15:05 ` Rafael Aquini
2020-03-11 0:04 ` Qian Cai
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