From: Roman Gushchin <roman.gushchin@linux.dev>
To: Zi Yan <ziy@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>,
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 4/5] mm: truncate: split huge page cache page to a non-zero order if possible.
Date: Mon, 21 Mar 2022 15:32:53 -0700 [thread overview]
Message-ID: <Yjj9FaoChB3u0Gbh@carbon.dhcp.thefacebook.com> (raw)
In-Reply-To: <20220321142128.2471199-5-zi.yan@sent.com>
On Mon, Mar 21, 2022 at 10:21:27AM -0400, Zi Yan wrote:
> From: Zi Yan <ziy@nvidia.com>
>
> To minimize the number of pages after a huge page truncation, we do not
> need to split it all the way down to order-0. The huge page has at most
> three parts, the part before offset, the part to be truncated, the part
> remaining at the end. Find the greatest common power of two multiplier of
> the non-zero values of them as the new order, so we can split the huge
> page to this order and keep the remaining pages as large and as few as
> possible.
Would you mind please to describe the algorithm in more details?
Thanks!
next prev parent reply other threads:[~2022-03-21 22:33 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
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 [this message]
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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