linux-kernel - Re: [PATCH] mm: thp: don't have to lock page anymore when splitting PMD

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Message-ID: <84a6c9c1-d18f-6955-2666-0a2d7bce6094@redhat.com>
Date:   Mon, 7 Mar 2022 09:24:58 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Yang Shi <shy828301@...il.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] mm: thp: don't have to lock page anymore when splitting
 PMD

On 07.03.22 03:07, Andrew Morton wrote:
> On Fri, 4 Mar 2022 19:50:08 +0100 David Hildenbrand <david@...hat.com> wrote:
> 
>> @Andrew, the last mail I received was
>>
>> + mm-huge_memory-remove-stale-locking-logic-from-__split_huge_pmd.patch
>> added to -mm tree
>>
>> The patch shows up in mmotm as
>>
>> #[merged]mm-huge_memory-remove-stale-locking-logic-from-__split_huge_pmd.patch
>>
>> ... which shouldn't be true.
> 
> I guess I mislabelled the reason for dropping it.  Should have been to-be-updated, 
> due to https://lkml.kernel.org/r/CAHbLzkpbnQyHRckoRtbZoaLvANu92MY4kEsbKudaQ8MDUA3nVg@mail.gmail.com
> 

Let me clarify.

1. I sent [1] (9 patches)

2. You queued the 9 patches

E.g., in "mmotm 2022-02-15-20-22 uploaded"

* mm-optimize-do_wp_page-for-exclusive-pages-in-the-swapcache.patch
* mm-optimize-do_wp_page-for-fresh-pages-in-local-lru-pagevecs.patch
* mm-slightly-clarify-ksm-logic-in-do_swap_page.patch
* mm-streamline-cow-logic-in-do_swap_page.patch
* mm-huge_memory-streamline-cow-logic-in-do_huge_pmd_wp_page.patch
* mm-khugepaged-remove-reuse_swap_page-usage.patch
* mm-swapfile-remove-stale-reuse_swap_page.patch
* mm-huge_memory-remove-stale-page_trans_huge_mapcount.patch
* mm-huge_memory-remove-stale-locking-logic-from-__split_huge_pmd.patch

3. The last patch in the series was dropped. What remains are 8 patches.

E.g., in "mmotm 2022-02-24-22-38 uploaded"

* mm-optimize-do_wp_page-for-exclusive-pages-in-the-swapcache.patch
* mm-optimize-do_wp_page-for-fresh-pages-in-local-lru-pagevecs.patch
* mm-slightly-clarify-ksm-logic-in-do_swap_page.patch
* mm-streamline-cow-logic-in-do_swap_page.patch
* mm-huge_memory-streamline-cow-logic-in-do_huge_pmd_wp_page.patch
* mm-khugepaged-remove-reuse_swap_page-usage.patch
* mm-swapfile-remove-stale-reuse_swap_page.patch
* mm-huge_memory-remove-stale-page_trans_huge_mapcount.patch

4. Yang Shi sent his patch (the one we're replying to)

5. You picked his patch and dropped it again due to [2]


I'm wondering why 3 happened and why
https://www.ozlabs.org/~akpm/mmotm/series contains:


mm-optimize-do_wp_page-for-exclusive-pages-in-the-swapcache.patch
mm-optimize-do_wp_page-for-fresh-pages-in-local-lru-pagevecs.patch
mm-slightly-clarify-ksm-logic-in-do_swap_page.patch
mm-streamline-cow-logic-in-do_swap_page.patch
mm-huge_memory-streamline-cow-logic-in-do_huge_pmd_wp_page.patch
mm-khugepaged-remove-reuse_swap_page-usage.patch
mm-swapfile-remove-stale-reuse_swap_page.patch
mm-huge_memory-remove-stale-page_trans_huge_mapcount.patch
...
#[merged]mm-huge_memory-remove-stale-locking-logic-from-__split_huge_pmd.patch


[1]
https://lore.kernel.org/linux-mm/20220131162940.210846-1-david@redhat.com/

[2]
https://lkml.kernel.org/r/CAHbLzkpbnQyHRckoRtbZoaLvANu92MY4kEsbKudaQ8MDUA3nVg@mail.gmail.com

-- 
Thanks,

David / dhildenb