linux-kernel - Re: [PATCH 1/2] mm: thp: relax __GFP_THISNODE for MADV

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Date:   Tue, 16 Oct 2018 16:16:43 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Mel Gorman <mgorman@...e.de>, David Rientjes <rientjes@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Argangeli <andrea@...nel.org>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>,
        "Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Stable tree <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm: thp:  relax __GFP_THISNODE for MADV_HUGEPAGE
 mappings

On Tue, 16 Oct 2018 19:11:49 -0400 Andrea Arcangeli <aarcange@...hat.com> wrote:

> This was a severe regression
> compared to previous kernels that made important workloads unusable
> and it starts when __GFP_THISNODE was added to THP allocations under
> MADV_HUGEPAGE. It is not a significant risk to go to the previous
> behavior before __GFP_THISNODE was added, it worked like that for
> years.

5265047ac301 ("mm, thp: really limit transparent hugepage allocation to
local node") was April 2015.  That's a long time for a "severe
regression" to go unnoticed?