linux-kernel - Re: [RFC] iomap: fix race between readahead and direct write

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Message-ID: <976d09e1-e3b5-a6a6-d159-9bdac3a7dc84@huawei.com>
Date:   Sun, 19 Jan 2020 09:17:00 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     Jan Kara <jack@...e.cz>
CC:     <hch@...radead.org>, <darrick.wong@...cle.com>,
        <linux-xfs@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <houtao1@...wei.com>,
        <zhengbin13@...wei.com>, <yi.zhang@...wei.com>
Subject: Re: [RFC] iomap: fix race between readahead and direct write



On 2020/1/17 19:05, Jan Kara wrote:
> provide
> allocation for each page separately

Thank you for your response!

I do understand there will be additional CPU overhead. But page is 
allocated in __do_page_cache_readahead(), which is called before
iomap_begin(). And I did not change that.

Thanks!
Yu Kuai