linux-kernel - Re: [PATCH v2 0/4] lockdep/crossrelease: Apply crossrelease to page locks

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Message-ID: <55674f0a-7886-f1d2-d7f1-6bf42c1e89e3@lge.com>
Date:   Tue, 5 Dec 2017 15:19:46 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     peterz@...radead.org, mingo@...nel.org, akpm@...ux-foundation.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-block@...r.kernel.org,
        kernel-team@....com, jack@...e.cz, jlayton@...hat.com,
        viro@...iv.linux.org.uk, hannes@...xchg.org, npiggin@...il.com,
        rgoldwyn@...e.com, vbabka@...e.cz, mhocko@...e.com,
        pombredanne@...b.com, vinmenon@...eaurora.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 0/4] lockdep/crossrelease: Apply crossrelease to page
 locks

On 12/5/2017 2:46 PM, Byungchul Park wrote:
> On 12/5/2017 2:30 PM, Matthew Wilcox wrote:
>> On Mon, Dec 04, 2017 at 02:16:19PM +0900, Byungchul Park wrote:
>>> For now, wait_for_completion() / complete() works with lockdep, add
>>> lock_page() / unlock_page() and its family to lockdep support.
>>>
>>> Changes from v1
>>>   - Move lockdep_map_cross outside of page_ext to make it flexible
>>>   - Prevent allocating lockdep_map per page by default
>>>   - Add a boot parameter allowing the allocation for debugging
>>>
>>> Byungchul Park (4):
>>>    lockdep: Apply crossrelease to PG_locked locks
>>>    lockdep: Apply lock_acquire(release) on __Set(__Clear)PageLocked
>>>    lockdep: Move data of CONFIG_LOCKDEP_PAGELOCK from page to page_ext
>>>    lockdep: Add a boot parameter enabling to track page locks using
>>>      lockdep and disable it by default
>>
>> I don't like the way you've structured this patch series; first adding
>> the lockdep map to struct page, then moving it to page_ext.
> 
> Hello,
> 
> I will make them into one patch.

I've thought it more.

Actually I did it because I thought I'd better make it into two
patches since it makes reviewers easier to review. It doesn't matter
which one I choose, but I prefer to split it.

But, if you are strongly against it, then I will follow you.

-- 
Thanks,
Byungchul