From: Chih-En Lin <shiyn.lin@gmail.com>
To: Nadav Amit <namit@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Qi Zheng <zhengqi.arch@bytedance.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
LKML <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
Iurii Zaikin <yzaikin@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
William Kucharski <william.kucharski@oracle.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Peter Xu <peterx@redhat.com>,
Suren Baghdasaryan <surenb@google.com>,
Arnd Bergmann <arnd@arndb.de>,
Tong Tiangen <tongtiangen@huawei.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Li kunyu <kunyu@nfschina.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Minchan Kim <minchan@kernel.org>, Yang Shi <shy828301@gmail.com>,
Song Liu <song@kernel.org>, Miaohe Lin <linmiaohe@huawei.com>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Andy Lutomirski <luto@kernel.org>,
Fenghua Yu <fenghua.yu@intel.com>,
Dinglan Peng <peng301@purdue.edu>,
Pedro Fonseca <pfonseca@purdue.edu>,
Jim Huang <jserv@ccns.ncku.edu.tw>,
Huichun Feng <foxhoundsk.tw@gmail.com>
Subject: Re: [RFC PATCH v2 5/9] mm, pgtable: Add a refcount to PTE table
Date: Wed, 28 Sep 2022 03:07:13 +0800 [thread overview]
Message-ID: <YzNJ4byJRZN7vBX8@strix-laptop> (raw)
In-Reply-To: <8C7248F0-55E4-4813-9167-C8CD2D02F1D0@vmware.com>
On Tue, Sep 27, 2022 at 05:59:16PM +0000, Nadav Amit wrote:
> Is there some assumption that pmd_get_pte() would not be called between the
> page_ref_add_unless() and cow_pte_fallback()?
>
> Hard to know without comments or context.
Yes.
It is one of the corner case that I need to handle it.
Thanks,
Chih-En Lin
next prev parent reply other threads:[~2022-09-27 19:07 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 16:29 [RFC PATCH v2 0/9] Introduce Copy-On-Write to Page Table Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 1/9] mm: Add new mm flags for Copy-On-Write PTE table Chih-En Lin
2022-09-27 17:23 ` Nadav Amit
2022-09-27 17:36 ` Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 2/9] mm: pgtable: Add sysctl to enable COW PTE Chih-En Lin
2022-09-27 17:27 ` Nadav Amit
2022-09-27 18:05 ` Chih-En Lin
2022-09-27 21:22 ` John Hubbard
2022-09-28 8:36 ` Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 3/9] mm, pgtable: Add ownership to PTE table Chih-En Lin
2022-09-27 17:30 ` Nadav Amit
2022-09-27 18:23 ` Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 4/9] mm: Add COW PTE fallback functions Chih-En Lin
2022-09-27 17:51 ` Nadav Amit
2022-09-27 19:00 ` Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 5/9] mm, pgtable: Add a refcount to PTE table Chih-En Lin
2022-09-27 17:59 ` Nadav Amit
2022-09-27 19:07 ` Chih-En Lin [this message]
2022-09-27 16:29 ` [RFC PATCH v2 6/9] mm, pgtable: Add COW_PTE_OWNER_EXCLUSIVE flag Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 7/9] mm: Add the break COW PTE handler Chih-En Lin
2022-09-27 18:15 ` Nadav Amit
2022-09-27 19:23 ` Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 8/9] mm: Handle COW PTE with reclaim algorithm Chih-En Lin
2022-09-27 16:29 ` [RFC PATCH v2 9/9] mm: Introduce Copy-On-Write PTE table Chih-En Lin
2022-09-27 18:38 ` Nadav Amit
2022-09-27 19:53 ` Chih-En Lin
2022-09-27 21:26 ` John Hubbard
2022-09-28 8:52 ` Chih-En Lin
2022-09-28 14:03 ` David Hildenbrand
2022-09-29 13:38 ` Chih-En Lin
2022-09-29 13:49 ` Chih-En Lin
2022-09-29 17:24 ` David Hildenbrand
2022-09-29 18:29 ` Chih-En Lin
2022-09-29 18:38 ` David Hildenbrand
2022-09-29 18:57 ` Chih-En Lin
2022-09-29 19:00 ` David Hildenbrand
2022-09-29 18:40 ` Nadav Amit
2022-09-29 19:02 ` Chih-En Lin
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