linux-kernel - Re: [PATCH v2 5/9] iomap: Support arbitrarily many blocks per page

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Date:   Fri, 11 Sep 2020 06:36:10 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        Dave Kleikamp <shaggy@...nel.org>,
        jfs-discussion@...ts.sourceforge.net,
        Dave Chinner <dchinner@...hat.com>
Subject: Re: [PATCH v2 5/9] iomap: Support arbitrarily many blocks per page

On Fri, Sep 11, 2020 at 12:47:03AM +0100, Matthew Wilcox (Oracle) wrote:
> Size the uptodate array dynamically to support larger pages in the
> page cache.  With a 64kB page, we're only saving 8 bytes per page today,
> but with a 2MB maximum page size, we'd have to allocate more than 4kB
> per page.  Add a few debugging assertions.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Dave Chinner <dchinner@...hat.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>