From: William Kucharski <william.kucharski@oracle.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Huang, Ying" <ying.huang@intel.com>,
Yang Shi <yang.shi@linux.alibaba.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: Sat, 11 May 2019 16:33:01 -0600 [thread overview]
Message-ID: <7B762A95-B8A6-4281-94F1-5DA6B62EDCF9@oracle.com> (raw)
In-Reply-To: <20190510163612.GA23417@bombadil.infradead.org>
> On May 10, 2019, at 10:36 AM, Matthew Wilcox <willy@infradead.org> wrote:
>
> 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).
>
> Better suggestions on naming gratefully received. I'm more happy with
> page_size() than I am with compound_nr(). page_nr() gives the wrong
> impression; page_count() isn't great either.
I like page_size() as well. At least to me, page_nr() or page_count() would
imply a basis of PAGESIZE, or that you would need to do something like:
page_size = page_nr() << PAGE_SHIFT;
to get the size in bytes; page_size() is more straightforward in that respect.
prev parent reply other threads:[~2019-05-11 22:33 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
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 [this message]
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