From: Zi Yan <ziy@nvidia.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>,
linux-mm@kvack.org, Shuah Khan <shuah@kernel.org>,
Yang Shi <shy828301@gmail.com>, Miaohe Lin <linmiaohe@huawei.com>,
Hugh Dickins <hughd@google.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [RFC PATCH 1/5] mm: memcg: make memcg huge page split support any order split.
Date: Mon, 21 Mar 2022 16:26:55 -0400 [thread overview]
Message-ID: <2FBD6D12-EDBE-4061-8738-E5E333F2367C@nvidia.com> (raw)
In-Reply-To: <YjjX/bZrUmQfFjHC@casper.infradead.org>
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On 21 Mar 2022, at 15:54, Matthew Wilcox wrote:
> On Mon, Mar 21, 2022 at 03:07:46PM -0400, Zi Yan wrote:
>> Yes. Will change it to new_nr to be consistent.
>
> uh, you're going to call ilog2?
fortunately, no. Inside split_page_memcg(), I probably
need to add VM_BUG_ON(nr % new_nr != 0) to make sure
new_nr is a divisor of nr, since there are a couple
of nr / new_nr operations. Otherwise, new_nr works.
>
> I think this would look less inconsistent if 'nr' were an unsigned long
> (how long until we need 16GB pages? Think PPC already supports those)
--
Best Regards,
Yan, Zi
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next prev parent reply other threads:[~2022-03-21 20:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 14:21 [RFC PATCH 0/5] Split a huge page to any lower order pages Zi Yan
2022-03-21 14:21 ` [RFC PATCH 1/5] mm: memcg: make memcg huge page split support any order split Zi Yan
2022-03-21 18:57 ` Roman Gushchin
2022-03-21 19:07 ` Zi Yan
2022-03-21 19:54 ` Matthew Wilcox
2022-03-21 20:26 ` Zi Yan [this message]
2022-03-21 14:21 ` [RFC PATCH 2/5] mm: page_owner: add support for splitting to any order in split page_owner Zi Yan
2022-03-21 19:02 ` Roman Gushchin
2022-03-21 19:08 ` Zi Yan
2022-03-21 14:21 ` [RFC PATCH 3/5] mm: thp: split huge page to any lower order pages Zi Yan
2022-03-21 22:18 ` Roman Gushchin
2022-03-22 14:21 ` Zi Yan
2022-03-22 3:21 ` Miaohe Lin
2022-03-22 14:30 ` Zi Yan
2022-03-23 2:31 ` Miaohe Lin
2022-03-23 22:10 ` Zi Yan
2022-03-24 2:02 ` Miaohe Lin
2022-03-22 20:57 ` Yang Shi
2022-03-21 14:21 ` [RFC PATCH 4/5] mm: truncate: split huge page cache page to a non-zero order if possible Zi Yan
2022-03-21 22:32 ` Roman Gushchin
2022-03-22 14:19 ` Zi Yan
2022-03-23 6:40 ` [mm] 2757cee2d6: UBSAN:shift-out-of-bounds_in_include/linux/log2.h kernel test robot
2022-03-21 14:21 ` [RFC PATCH 5/5] mm: huge_memory: enable debugfs to split huge pages to any order Zi Yan
2022-03-21 22:23 ` Roman Gushchin
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