linux-kernel - Re: [PATCH] mm: vmscan: correct nr

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Date:   Fri, 10 May 2019 08:48:58 -0700
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     William Kucharski <william.kucharski@...cle.com>,
        "Huang, Ying" <ying.huang@...el.com>
Cc:     hannes@...xchg.org, mhocko@...e.com, mgorman@...hsingularity.net,
        kirill.shutemov@...ux.intel.com, hughd@...gle.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: vmscan: correct nr_reclaimed for THP



On 5/9/19 9:33 PM, William Kucharski wrote:
>
>> On May 9, 2019, at 9:03 PM, Huang, Ying <ying.huang@...el.com> wrote:
>>
>> Yang Shi <yang.shi@...ux.alibaba.com> writes:
>>
>>> On 5/9/19 7:12 PM, Huang, Ying wrote:
>>>> How about to change this to
>>>>
>>>>
>>>>          nr_reclaimed += hpage_nr_pages(page);
>>> Either is fine to me. Is this faster than "1 << compound_order(page)"?
>> I think the readability is a little better.  And this will become
>>
>>         nr_reclaimed += 1
>>
>> if CONFIG_TRANSPARENT_HUAGEPAGE is disabled.
> I find this more legible and self documenting, and it avoids the bit shift
> operation completely on the majority of systems where THP is not configured.

Yes, I do agree. Thanks for the suggestion.
>