linux-kernel - Re: [PATCH -mm -v7 4/9] mm, THP, swap: Add get_huge_swap

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Date:   Sat, 01 Apr 2017 11:32:38 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     "Huang\, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH -mm -v7 4/9] mm, THP, swap: Add get_huge_swap_page()

Johannes Weiner <hannes@...xchg.org> writes:

> On Thu, Mar 30, 2017 at 12:28:17PM +0800, Huang, Ying wrote:
>> Johannes Weiner <hannes@...xchg.org> writes:
>> > On Tue, Mar 28, 2017 at 01:32:04PM +0800, Huang, Ying wrote:
>> >> @@ -527,6 +527,23 @@ static inline swp_entry_t get_swap_page(void)
>> >>  
>> >>  #endif /* CONFIG_SWAP */
>> >>  
>> >> +#ifdef CONFIG_THP_SWAP_CLUSTER
>> >> +static inline swp_entry_t get_huge_swap_page(void)
>> >> +{
>> >> +	swp_entry_t entry;
>> >> +
>> >> +	if (get_swap_pages(1, &entry, true))
>> >> +		return entry;
>> >> +	else
>> >> +		return (swp_entry_t) {0};
>> >> +}
>> >> +#else
>> >> +static inline swp_entry_t get_huge_swap_page(void)
>> >> +{
>> >> +	return (swp_entry_t) {0};
>> >> +}
>> >> +#endif
>> >
>> > Your introducing a function without a user, making it very hard to
>> > judge whether the API is well-designed for the callers or not.
>> >
>> > I pointed this out as a systemic problem with this patch series in v3,
>> > along with other stuff, but with the way this series is structured I'm
>> > having a hard time seeing whether you implemented my other feedback or
>> > whether your counter arguments to them are justified.
>> >
>> > I cannot review and ack these patches this way.
>> 
>> Sorry for inconvenience, I will send a new version to combine the
>> function definition and usage into one patch at least for you to
>> review.
>
> We tried this before. I reviewed the self-contained patch and you
> incorporated the feedback into the split-out structure that made it
> impossible for me to verify the updates.
>
> I'm not sure why you insist on preserving this series format. It's not
> good for review, and it's not good for merging and git history.

I had thought some reviewers would prefer the original series format.
But I will use your suggested format in the future, unless more
reviewers prefer the original format.

Best Regards,
Huang, Ying

>> But I think we can continue our discussion in the comments your
>> raised so far firstly, what do you think about that?
>
> Yeah, let's finish the discussions before -v8.