linux-kernel - Re: [PATCH v3 3/7] mm: Add write-protect and clean utilities for address space ranges

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Message-ID: <20191002181342.GB32665@bombadil.infradead.org>
Date:   Wed, 2 Oct 2019 11:13:42 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>, Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Huang Ying <ying.huang@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH v3 3/7] mm: Add write-protect and clean utilities for
 address space ranges

On Wed, Oct 02, 2019 at 11:06:43AM -0700, Linus Torvalds wrote:
> On Wed, Oct 2, 2019 at 6:48 AM Thomas Hellström (VMware)
> <thomas_os@...pmail.org> wrote:
> >
> > From: Thomas Hellstrom <thellstrom@...are.com>
> >
> > Add two utilities to a) write-protect and b) clean all ptes pointing into
> > a range of an address space.
[...]
> Yes, it's a bit more typing. But I really think
> "clean_mapping_dirty_pages()" is just not only more in line with the
> mm naming, I think it's a lot more legible and understandable than
> "as_dirty_clean()", which just makes me go "what the heck does that
> function do?"
> 
> And I really think it needs more than just "as" -> "mapping".
> "mapping_dirty_clean()" still makes me go "what?" in a way that
> "clean_mapping_dirty_pages()" does not. One name reads as a series or
> random words, the other reads as a "this is what the function does".

I'd suggest clean_mapping_pages() -- a function which does that would
naturally skip the non-dirty pages, and that doesn't need to be in the
function name.