From: Peter Xu <peterx@redhat•com>
To: Christoph Hellwig <hch@infradead•org>
Cc: Andrea Arcangeli <aarcange@redhat•com>,
James Houghton <jthoughton@google•com>,
Lorenzo Stoakes <lstoakes@gmail•com>,
David Hildenbrand <david@redhat•com>,
John Hubbard <jhubbard@nvidia•com>,
Yang Shi <shy828301@gmail•com>, Rik van Riel <riel@surriel•com>,
Hugh Dickins <hughd@google•com>,
linux-kernel@vger•kernel.org,
Matthew Wilcox <willy@infradead•org>,
linux-mm@kvack•org, Mike Rapoport <rppt@kernel•org>,
Jason Gunthorpe <jgg@nvidia•com>,
"Kirill A . Shutemov" <kirill@shutemov•name>,
Axel Rasmussen <axelrasmussen@google•com>,
Andrew Morton <akpm@linux-foundation•org>,
linuxppc-dev@lists•ozlabs.org, Vlastimil Babka <vbabka@suse•cz>,
Mike Kravetz <mike.kravetz@oracle•com>
Subject: Re: [PATCH RFC 06/12] mm/gup: Drop folio_fast_pin_allowed() in hugepd processing
Date: Thu, 23 Nov 2023 11:10:00 -0500 [thread overview]
Message-ID: <ZV95WMqoZzchrcBY@x1n> (raw)
In-Reply-To: <ZV79jpaeiiN2tGm/@infradead.org>
On Wed, Nov 22, 2023 at 11:21:50PM -0800, Christoph Hellwig wrote:
> That alone sounds like a good reason to not bother. So unless more
> qualified people have a different opinion I'm fine with this patch
> as long as you leave a comment in place, and ammend the commit message
> with some of the very useful information from your mail.
Will do, thanks.
This is what I will squash into the same patch in the new version, as the
current plan:
+/*
+ * NOTE: currently hugepd is only used in hugetlbfs file systems on Power,
+ * which does not have issue with folio writeback against GUP updates.
+ * When hugepd will be extended to support non-hugetlbfs or even anonymous
+ * memory, we need to do extra check as what we do with most of the other
+ * folios. See writable_file_mapping_allowed() and folio_fast_pin_allowed()
+ * for more information.
+ */
static int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
unsigned int pdshift, unsigned long end, unsigned int flags,
struct page **pages, int *nr)
--
Peter Xu
next prev parent reply other threads:[~2023-11-23 16:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20231116012908.392077-1-peterx@redhat.com>
2023-11-16 1:29 ` [PATCH RFC 06/12] mm/gup: Drop folio_fast_pin_allowed() in hugepd processing Peter Xu
2023-11-20 8:26 ` Christoph Hellwig
2023-11-21 15:59 ` Peter Xu
2023-11-22 8:00 ` Christoph Hellwig
2023-11-22 15:22 ` Peter Xu
2023-11-23 7:21 ` Christoph Hellwig
2023-11-23 16:10 ` Peter Xu [this message]
2023-11-23 18:22 ` Christophe Leroy
2023-11-23 19:37 ` Peter Xu
2023-11-24 5:28 ` Aneesh Kumar K.V
2023-11-24 7:03 ` Christophe Leroy
2023-11-24 18:16 ` Peter Xu
2023-11-24 1:06 ` Michael Ellerman
2023-11-23 15:47 ` Matthew Wilcox
2023-11-23 17:22 ` Peter Xu
2023-11-23 19:11 ` Ryan Roberts
2023-11-23 19:46 ` Peter Xu
2023-11-24 9:06 ` Ryan Roberts
2023-11-24 16:07 ` Peter Xu
2023-11-30 21:30 ` Peter Xu
2023-12-03 13:33 ` Christophe Leroy
2023-12-04 11:11 ` Ryan Roberts
2023-12-04 11:25 ` Christophe Leroy
2023-12-04 11:46 ` Ryan Roberts
2023-12-04 11:57 ` Christophe Leroy
2023-12-04 12:02 ` Ryan Roberts
2023-12-04 16:48 ` Peter Xu
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