From: Matthew Wilcox <willy@infradead.org>
To: David Laight <David.Laight@aculab.com>
Cc: "linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"Darrick J . Wong" <darrick.wong@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Dave Kleikamp <shaggy@kernel.org>,
"jfs-discussion@lists.sourceforge.net"
<jfs-discussion@lists.sourceforge.net>,
Christoph Hellwig <hch@lst.de>,
Dave Chinner <dchinner@redhat.com>
Subject: Re: [PATCH v2 2/9] fs: Introduce i_blocks_per_page
Date: Tue, 15 Sep 2020 16:49:41 +0100 [thread overview]
Message-ID: <20200915154941.GJ5449@casper.infradead.org> (raw)
In-Reply-To: <0c874f14499c4d819f3e8e09f5086d77@AcuMS.aculab.com>
On Tue, Sep 15, 2020 at 03:40:52PM +0000, David Laight wrote:
> > @@ -147,7 +147,7 @@ iomap_iop_set_range_uptodate(struct page *page, unsigned off, unsigned len)
> > unsigned int i;
> >
> > spin_lock_irqsave(&iop->uptodate_lock, flags);
> > - for (i = 0; i < PAGE_SIZE / i_blocksize(inode); i++) {
> > + for (i = 0; i < i_blocks_per_page(inode, page); i++) {
>
> You probably don't want to call the helper every time
> around the loop.
This is a classic example of focusing on the details and missing the
larger picture. We don't want the loop at all, and if you'd kept reading
the patch series, you'd see it disappear later.
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next prev parent reply other threads:[~2020-09-15 15:49 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 23:46 [PATCH v2 0/9] THP iomap patches for 5.10 Matthew Wilcox (Oracle)
2020-09-10 23:46 ` [PATCH v2 1/9] iomap: Fix misplaced page flushing Matthew Wilcox (Oracle)
2020-09-10 23:47 ` [PATCH v2 2/9] fs: Introduce i_blocks_per_page Matthew Wilcox (Oracle)
2020-09-15 14:58 ` Dave Kleikamp
2020-09-15 15:40 ` David Laight
2020-09-15 15:49 ` Matthew Wilcox [this message]
2020-09-10 23:47 ` [PATCH v2 3/9] iomap: Use kzalloc to allocate iomap_page Matthew Wilcox (Oracle)
2020-09-10 23:47 ` [PATCH v2 4/9] iomap: Use bitmap ops to set uptodate bits Matthew Wilcox (Oracle)
2020-09-10 23:47 ` [PATCH v2 5/9] iomap: Support arbitrarily many blocks per page Matthew Wilcox (Oracle)
2020-09-11 5:36 ` Christoph Hellwig
2020-09-17 22:00 ` Darrick J. Wong
2020-09-22 16:23 ` Qian Cai
2020-09-22 17:05 ` Matthew Wilcox
2020-09-22 17:25 ` Qian Cai
2020-09-23 1:06 ` Qian Cai
2020-09-23 2:48 ` Matthew Wilcox
2020-09-23 5:00 ` Darrick J. Wong
2020-09-23 18:59 ` Matthew Wilcox
2020-09-23 16:55 ` Qian Cai
2020-09-24 1:07 ` Matthew Wilcox
2020-09-10 23:47 ` [PATCH v2 6/9] iomap: Convert read_count to read_bytes_pending Matthew Wilcox (Oracle)
2020-09-11 5:36 ` Christoph Hellwig
2020-09-17 22:02 ` Darrick J. Wong
2020-09-10 23:47 ` [PATCH v2 7/9] iomap: Convert write_count to write_bytes_pending Matthew Wilcox (Oracle)
2020-09-17 22:02 ` Darrick J. Wong
2020-09-10 23:47 ` [PATCH v2 8/9] iomap: Convert iomap_write_end types Matthew Wilcox (Oracle)
2020-09-17 22:03 ` Darrick J. Wong
2020-09-10 23:47 ` [PATCH v2 9/9] iomap: Change calling convention for zeroing Matthew Wilcox (Oracle)
2020-09-11 6:42 ` Christoph Hellwig
2020-09-17 22:05 ` Darrick J. Wong
2020-09-17 22:11 ` Matthew Wilcox
2020-09-17 22:18 ` Darrick J. Wong
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