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Date:   Mon, 4 Dec 2023 11:30:39 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Ryan Roberts <ryan.roberts@arm.com>
Cc:     Matthew Wilcox <willy@infradead.org>,
        Yin Fengwei <fengwei.yin@intel.com>,
        David Hildenbrand <david@redhat.com>,
        Yu Zhao <yuzhao@google.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Yang Shi <shy828301@gmail.com>,
        "Huang, Ying" <ying.huang@intel.com>, Zi Yan <ziy@nvidia.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Itaru Kitayama <itaru.kitayama@gmail.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        John Hubbard <jhubbard@nvidia.com>,
        David Rientjes <rientjes@google.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Hugh Dickins <hughd@google.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Barry Song <21cnbao@gmail.com>,
        Alistair Popple <apopple@nvidia.com>, linux-mm@kvack.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 00/10] Multi-size THP for anonymous memory
Message-Id: <20231204113039.42510c23455026e40c5e2a56@linux-foundation.org>
In-Reply-To: <20231204102027.57185-1-ryan.roberts@arm.com>
References: <20231204102027.57185-1-ryan.roberts@arm.com>
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On Mon,  4 Dec 2023 10:20:17 +0000 Ryan Roberts <ryan.roberts@arm.com> wrote:

> Hi All,
> 
> 
> Prerequisites
> =============
> 
> Some work items identified as being prerequisites are listed on page 3 at [9].
> The summary is:
> 
> | item                          | status                  |
> |:------------------------------|:------------------------|
> | mlock                         | In mainline (v6.7)      |
> | madvise                       | In mainline (v6.6)      |
> | compaction                    | v1 posted [10]          |
> | numa balancing                | Investigated: see below |
> | user-triggered page migration | In mainline (v6.7)      |
> | khugepaged collapse           | In mainline (NOP)       |

What does "prerequisites" mean here?  Won't compile without?  Kernel
crashes without?  Nice-to-have-after?  Please expand on this.

I looked at [9], but access is denied.

> [9] https://drive.google.com/file/d/1GnfYFpr7_c1kA41liRUW5YtCb8Cj18Ud/view?usp=sharing&resourcekey=0-U1Mj3-RhLD1JV6EThpyPyA