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Date:   Wed, 23 Mar 2022 21:47:58 -0400
From:   "Theodore Ts'o" <tytso@mit.edu>
To:     Yang Shi <shy828301@gmail.com>
Cc:     vbabka@suse.cz, kirill.shutemov@linux.intel.com,
        linmiaohe@huawei.com, songliubraving@fb.com, riel@surriel.com,
        willy@infradead.org, ziy@nvidia.com, akpm@linux-foundation.org,
        adilger.kernel@dilger.ca, darrick.wong@oracle.com,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [v2 PATCH 0/8] Make khugepaged collapse readonly FS THP more
 consistent
Message-ID: <YjvNzvdcagflTejJ@mit.edu>
References: <20220317234827.447799-1-shy828301@gmail.com>
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On Thu, Mar 17, 2022 at 04:48:19PM -0700, Yang Shi wrote:
> 
> The patch 1 ~ 7 are minor bug fixes, clean up and preparation patches.
> The patch 8 converts ext4 and xfs.  We may need convert more filesystems,
> but I'd like to hear some comments before doing that.

Adding a hard-coded call to khugepage_enter_file() in ext4 and xfs,
and potentially, each file system, seems kludgy as all heck.  Is there
any reason not to simply call it in the mm code which calls f_op->mmap()?

    	       	  	      	 - Ted