From: Christoph Hellwig <hch@infradead.org>
To: David Howells <dhowells@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
David Hildenbrand <david@redhat.com>,
Jens Axboe <axboe@kernel.dk>, Al Viro <viro@zeniv.linux.org.uk>,
Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
Jeff Layton <jlayton@kernel.org>,
Jason Gunthorpe <jgg@nvidia.com>,
Logan Gunthorpe <logang@deltatee.com>,
Hillf Danton <hdanton@sina.com>,
Christian Brauner <brauner@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH v2 3/3] block: Use iov_iter_extract_pages() and page pinning in direct-io.c
Date: Fri, 26 May 2023 01:26:00 -0700 [thread overview]
Message-ID: <ZHBtGJ3SzJtr5HZP@infradead.org> (raw)
In-Reply-To: <20230525223953.225496-4-dhowells@redhat.com>
On Thu, May 25, 2023 at 11:39:53PM +0100, David Howells wrote:
> Change the old block-based direct-I/O code to use iov_iter_extract_pages()
> to pin user pages or leave kernel pages unpinned rather than taking refs
> when submitting bios.
>
> This makes use of the preceding patches to not take pins on the zero page
> (thereby allowing insertion of zero pages in with pinned pages) and to get
> additional pins on pages, allowing an extracted page to be used in multiple
> bios without having to re-extract it.
I'm not seeing where we skip the unpin of the zero page, as commented
in patch 1 (but maybe I'm not reviewing carefully enough as I'm at a
conference right now).
Otherwise my only rather cosmetic comment right now is that I'd called
the "need_unpin" member is_pinned.
next prev parent reply other threads:[~2023-05-26 8:26 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-25 22:39 [RFC PATCH v2 0/3] block: Make old dio use iov_iter_extract_pages() and page pinning David Howells
2023-05-25 22:39 ` [RFC PATCH v2 1/3] mm: Don't pin ZERO_PAGE in pin_user_pages() David Howells
2023-05-26 8:10 ` Lorenzo Stoakes
2023-05-26 8:17 ` Christoph Hellwig
2023-05-26 8:22 ` Christoph Hellwig
2023-05-26 8:27 ` Lorenzo Stoakes
2023-05-26 8:29 ` David Howells
2023-05-26 8:43 ` David Howells
2023-05-26 8:58 ` Lorenzo Stoakes
2023-05-26 9:15 ` David Howells
2023-05-26 9:23 ` Lorenzo Stoakes
2023-05-26 9:24 ` David Hildenbrand
2023-05-25 22:39 ` [RFC PATCH v2 2/3] mm: Provide a function to get an additional pin on a page David Howells
2023-05-26 2:29 ` Linus Torvalds
2023-05-26 5:50 ` David Howells
2023-05-26 8:20 ` Christoph Hellwig
2023-05-26 8:31 ` David Howells
2023-05-25 22:39 ` [RFC PATCH v2 3/3] block: Use iov_iter_extract_pages() and page pinning in direct-io.c David Howells
2023-05-26 8:26 ` Christoph Hellwig [this message]
2023-05-26 8:33 ` David Howells
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