Messages in this thread | | | Subject | Re: [PATCH] mm: vmscan: correct nr_reclaimed for THP | From | Yang Shi <> | Date | Fri, 10 May 2019 09:50:04 -0700 |
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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?
> > 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.
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