linux-kernel - Re: [PATCH v14 052/138] mm: Add folio_raw

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Message-ID: <YRf3/8xtVzTZiKNu@casper.infradead.org>
Date:   Sat, 14 Aug 2021 18:06:07 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v14 052/138] mm: Add folio_raw_mapping()

On Wed, Aug 11, 2021 at 03:59:06PM +0200, Vlastimil Babka wrote:
> On 7/15/21 5:35 AM, Matthew Wilcox (Oracle) wrote:
> > Convert __page_rmapping to folio_raw_mapping and move it to mm/internal.h.
> > It's only a couple of instructions (load and mask), so it's definitely
> > going to be cheaper to inline it than call it.  Leave page_rmapping
> > out of line.
> 
> Maybe mention the page_anon_vma() in changelog too?

Convert __page_rmapping to folio_raw_mapping and move it to mm/internal.h.
It's only a couple of instructions (load and mask), so it's definitely
going to be cheaper to inline it than call it.  Leave page_rmapping
out of line.  Change page_anon_vma() to not call folio_raw_mapping() --
it's more efficient to do the subtraction than the mask.