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

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Message-ID: <0aad02e4-f477-1ee3-471a-3e1371ebba1e@lge.com>
Date:   Tue, 5 Dec 2017 14:46:48 +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 2:30 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 also don't like it that you've made CONFIG_LOCKDEP_PAGELOCK not
> individually selectable.  I might well want a kernel with crosslock
> support, but only for completions.

OK then, I will make it individually selectable.

I want to know others' opinions as well.

Thank you for the opinions. I will apply yours next spin.

-- 
Thanks,
Byungchul