From: Yang Shi <yang.shi@linux.alibaba.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Huang, Ying" <ying.huang@intel.com>,
hannes@cmpxchg.org, mhocko@suse.com, mgorman@techsingularity.net,
kirill.shutemov@linux.intel.com, hughd@google.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: vmscan: correct nr_reclaimed for THP
Date: Fri, 10 May 2019 09:54:11 -0700 [thread overview]
Message-ID: <72fb1554-4cda-27f4-8c09-038ab3350ff8@linux.alibaba.com> (raw)
In-Reply-To: <20190510165207.GB3162@bombadil.infradead.org>
On 5/10/19 9:52 AM, Matthew Wilcox wrote:
> On Fri, May 10, 2019 at 09:50:04AM -0700, Yang Shi wrote:
>> On 5/10/19 9:36 AM, Matthew Wilcox wrote:
>>> On Fri, May 10, 2019 at 10:12:40AM +0800, Huang, Ying wrote:
>>>>> + nr_reclaimed += (1 << compound_order(page));
>>>> How about to change this to
>>>>
>>>> nr_reclaimed += hpage_nr_pages(page);
>>> Please don't. That embeds the knowledge that we can only swap out either
>>> normal pages or THP sized pages. I'm trying to make the VM capable of
>>> supporting arbitrary-order pages, and this would be just one more place
>>> to fix.
>>>
>>> I'm sympathetic to the "self documenting" argument. My current tree has
>>> a patch in it:
>>>
>>> mm: Introduce compound_nr
>>> Replace 1 << compound_order(page) with compound_nr(page). Minor
>>> improvements in readability.
>>>
>>> It goes along with this patch:
>>>
>>> mm: Introduce page_size()
>>>
>>> It's unnecessarily hard to find out the size of a potentially huge page.
>>> Replace 'PAGE_SIZE << compound_order(page)' with page_size(page).
>> So you prefer keeping using "1 << compound_order" as v1 did? Then you will
>> convert all "1 << compound_order" to compound_nr?
> Yes. Please, let's merge v1 and ignore v2.
Fine to me. I think Andrew will take care of it, Andrew?
next prev parent reply other threads:[~2019-05-10 16:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-10 0:16 [PATCH] mm: vmscan: correct nr_reclaimed for THP Yang Shi
2019-05-10 0:39 ` Shakeel Butt
2019-05-10 2:12 ` Huang, Ying
2019-05-10 2:25 ` Yang Shi
2019-05-10 3:03 ` Huang, Ying
2019-05-10 4:33 ` William Kucharski
2019-05-10 15:48 ` Yang Shi
2019-05-10 15:41 ` Yang Shi
2019-05-10 16:36 ` Matthew Wilcox
2019-05-10 16:50 ` Yang Shi
2019-05-10 16:52 ` Matthew Wilcox
2019-05-10 16:54 ` Yang Shi [this message]
2019-05-10 22:54 ` Ira Weiny
2019-05-10 23:06 ` Matthew Wilcox
2019-05-11 4:09 ` Yafang Shao
2019-05-11 22:33 ` William Kucharski
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