From: Matthew Wilcox <willy@infradead.org>
To: Wang Yugui <wangyugui@e16-tech.com>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@infradead.org>,
"Darrick J . Wong" <djwong@kernel.org>
Subject: Re: [PATCH 1/3] filemap: Allow __filemap_get_folio to allocate large folios
Date: Sun, 21 May 2023 04:39:16 +0100 [thread overview]
Message-ID: <ZGmSZP2DeRD/XSun@casper.infradead.org> (raw)
In-Reply-To: <20230521100434.716E.409509F4@e16-tech.com>
On Sun, May 21, 2023 at 10:04:35AM +0800, Wang Yugui wrote:
> > I don't see it?
> >
> > size == 1 << 20;
> >
> > shift = 20;
> > return (20 - 12) << 26;
> >
> > Looks like about 1 << 29 to me.
>
> sorry that I wrongly
> 1) wrongly conside PAGE_SHIFT as 13 from arch/alpha/include/asm/page.h
> it should be 12 from arch/x86/include/asm/page_types.h.
>
> 2) wrongly conside
> (20 - 12) << 26
> as
> 1<< (20 - 12) << 26
Ah, no problem. Glad I didn't miss something.
next prev parent reply other threads:[~2023-05-21 3:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-20 16:36 [PATCH 0/3] Create large folios in iomap buffered write path Matthew Wilcox (Oracle)
2023-05-20 16:36 ` [PATCH 1/3] filemap: Allow __filemap_get_folio to allocate large folios Matthew Wilcox (Oracle)
2023-05-21 1:02 ` Wang Yugui
2023-05-21 1:56 ` Matthew Wilcox
2023-05-21 2:04 ` Wang Yugui
2023-05-21 3:39 ` Matthew Wilcox [this message]
2023-05-21 2:13 ` Dave Chinner
2023-05-21 3:38 ` Matthew Wilcox
2023-05-23 5:59 ` Christoph Hellwig
2023-05-23 12:17 ` Matthew Wilcox
2023-05-20 16:36 ` [PATCH 2/3] iomap: Create large folios in the buffered write path Matthew Wilcox (Oracle)
2023-05-20 16:36 ` [PATCH 3/3] iomap: Copy larger chunks from userspace Matthew Wilcox (Oracle)
2023-05-20 19:11 ` kernel test robot
2023-05-20 19:25 ` kernel test robot
2023-05-21 0:49 ` [PATCH 0/3] Create large folios in iomap buffered write path Wang Yugui
2023-05-21 0:59 ` Matthew Wilcox
2023-05-21 1:38 ` Wang Yugui
2023-05-21 2:49 ` Dave Chinner
2023-05-21 11:40 ` Wang Yugui
2023-05-31 4:34 ` Wang Yugui
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