linux-kernel - Re: [PATCH v5 2/2] mm,thp: Add experimental config option RO_EXEC_FILEMAP_HUGE_FAULT

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Date:   Tue, 3 Sep 2019 21:23:34 -0600
From:   William Kucharski <william.kucharski@...cle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Bob Kasten <robert.a.kasten@...el.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Chad Mynhier <chad.mynhier@...cle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Johannes Weiner <jweiner@...com>
Subject: Re: [PATCH v5 2/2] mm,thp: Add experimental config option
 RO_EXEC_FILEMAP_HUGE_FAULT_THP



> On Sep 3, 2019, at 1:15 PM, Michal Hocko <mhocko@...nel.org> wrote:
> 
> Then I would suggest mentioning all this in the changelog so that the
> overall intention is clear. It is also up to you fs developers to find a
> consensus on how to move forward. I have brought that up mostly because
> I really hate seeing new config options added due to shortage of
> confidence in the code. That really smells like working around standard
> code quality inclusion process.

I do mention a good deal of this in the blurb in part [0/2] of the patch,
though I don't cover the readpage/readpages() debate. Ideally readpage()
should do just that, read a page, based on the size of the page passed,
and not assume "page" means "PAGESIZE."

I can also make the "help" text for the option more descriptive if
desired.

Thanks for your comments!