linux-kernel - Re: [PATCH v5 03/78] xarray: Add the xa_lock to the radix_tree

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Message-ID: <20171226165440.tv6inwa2fgk3bfy6@node.shutemov.name>
Date:   Tue, 26 Dec 2017 19:54:40 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        David Howells <dhowells@...hat.com>,
        Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Rehas Sachdeva <aquannie@...il.com>,
        Marc Zyngier <marc.zyngier@....com>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-raid@...r.kernel.org
Subject: Re: [PATCH v5 03/78] xarray: Add the xa_lock to the radix_tree_root

On Fri, Dec 15, 2017 at 02:03:35PM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> This results in no change in structure size on 64-bit x86 as it fits in
> the padding between the gfp_t and the void *.

The patch does more than described in the subject and commit message. At first
I was confused why do you need to touch idr here. It took few minutes to figure
it out.

Could you please add more into commit message about lockname and xa_ locking
interface since you introduce it here?

-- 
 Kirill A. Shutemov