linux-kernel - Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1).

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Date: Tue, 13 Feb 2024 21:56:45 -0500
From: Zi Yan <ziy@...dia.com>
To: Luis Chamberlain <mcgrof@...nel.org>
Cc: "\"Pankaj Raghav (Samsung)\"" <kernel@...kajraghav.com>,
 linux-mm@...ck.org, "\"Matthew Wilcox (Oracle)\"" <willy@...radead.org>,
 David Hildenbrand <david@...hat.com>, Yang Shi <shy828301@...il.com>,
 Yu Zhao <yuzhao@...gle.com>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@...ux.intel.com>,
 Ryan Roberts <ryan.roberts@....com>,
 "Michal Koutný" <mkoutny@...e.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 "\"Zach O'Keefe\"" <zokeefe@...gle.com>, Hugh Dickins <hughd@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages
 (except order-1).

On 13 Feb 2024, at 17:19, Zi Yan wrote:

> On 13 Feb 2024, at 17:15, Zi Yan wrote:
>
>> On 13 Feb 2024, at 17:05, Luis Chamberlain wrote:
>>
>>> On Tue, Feb 13, 2024 at 04:55:18PM -0500, Zi Yan wrote:
>>>> From: Zi Yan <ziy@...dia.com>
>>>> Order-1 folio is not supported because _deferred_list, which is used by
>>>> partially mapped folios, is stored in subpage 2 and an order-1 folio only
>>>> has subpage 0 and 1.
>>>
>>> The LBS patches has the patch from Matthew which enables and allowed us
>>> to successfully test order 1. So this restriction could be dropped if
>>> that gets merged.
>>
>> OK. But it only applies to file-backed folios IIUC. Anonymous folios still
>> cannot be split to order-1.
>
> Something like this would lift the restriction:

Actually this, since folio_prep_large_rmappable() is changed by that patch:

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0564b007cbd1..05eeeafaa9dc 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2852,7 +2852,7 @@ static void __split_huge_page_tail(struct folio *folio, int tail,
        clear_compound_head(page_tail);
        if (new_order) {
                prep_compound_page(page_tail, new_order);
-               folio_prep_large_rmappable(page_folio(page_tail));
+               new_folio = folio_prep_large_rmappable(new_folio);
        }

        /* Finally unfreeze refcount. Additional reference from page cache. */
@@ -3045,9 +3045,9 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
        VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
        VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);

-       /* Cannot split THP to order-1 (no order-1 THPs) */
-       if (new_order == 1) {
-               VM_WARN_ONCE(1, "Cannot split to order-1 folio");
+       /* Cannot split anonymous folios to order-1 (no order-1 anon folios) */
+       if (new_order == 1 && folio_test_anon(folio)) {
+               VM_WARN_ONCE(1, "Cannot split to order-1 anonymous folio");
                return -EINVAL;
        }

--
Best Regards,
Yan, Zi

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