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Date:   Fri, 16 Jul 2021 02:10:51 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Dave Hansen <dave.hansen@intel.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Huang Ying <ying.huang@intel.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Dave Hansen <dave.hansen@linux.intel.com>,
        yang.shi@linux.alibaba.com, rientjes@google.com,
        dan.j.williams@intel.com, david@redhat.com, osalvador@suse.de,
        weixugc@google.com, Michal Hocko <mhocko@suse.com>,
        Yang Shi <shy828301@gmail.com>, Zi Yan <ziy@nvidia.com>
Subject: Re: [PATCH -V10 0/9] Migrate Pages in lieu of discard
Message-ID: <YPDcmzSq2YKS9jZ9@casper.infradead.org>
References: <20210715055145.195411-1-ying.huang@intel.com>
 <20210715123836.ad76b0a2e29c0bbd3cd67767@linux-foundation.org>
 <e571c5d8-4be3-c983-dcc2-aff5217aa055@intel.com>
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On Thu, Jul 15, 2021 at 02:42:07PM -0700, Dave Hansen wrote:
> The end game for auto-migration is to on by default, wherever these
> hardware configurations show up.  Just like THP, I expect this to be
> broadly useful.  But, given the breadth of our user base, I also expect
> it to be nasty for a minority of users.  They'll need a way to turn it
> off, and hopefully they'll also provide feedback so that, if possible,
> we can improve the default behavior and bring them back into the fold.

... or if the THP experience is anything to go by, they continue to
shout loudly about how borken it is for a decade ;-(