linux-kernel - Re: [PATCHv3 6/6] mm/gup: Cache dev

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Date:   Tue, 2 Oct 2018 10:05:58 -0600
From:   Keith Busch <keith.busch@...el.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCHv3 6/6] mm/gup: Cache dev_pagemap while pinning pages

On Tue, Oct 02, 2018 at 08:49:39AM -0700, Dave Hansen wrote:
> On 10/02/2018 04:26 AM, Kirill A. Shutemov wrote:
> >> +	page = follow_page_mask(vma, address, foll_flags, &ctx);
> >> +	if (ctx.pgmap)
> >> +		put_dev_pagemap(ctx.pgmap);
> >> +	return page;
> >>  }
> > Do we still want to keep the function as inline? I don't think so.
> > Let's move it into mm/gup.c and make struct follow_page_context private to
> > the file.
> 
> Yeah, and let's have a put_follow_page_context() that does the
> put_dev_pagemap() rather than spreading that if() to each call site.

Thanks for all the feedback. I will make a new version, but with the
gup_benchmark part split into an independent set since it is logically
separate from the final patch.