linux-kernel - Re: [External] Re: [PATCH v5 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE

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Message-ID: <CAMZfGtW2QEuRgYv_WXjN5OU+EhLPO9UHJ+8puSoVG8cwKQBvjA@mail.gmail.com>
Date:   Fri, 20 Nov 2020 16:53:37 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, viro@...iv.linux.org.uk,
        Andrew Morton <akpm@...ux-foundation.org>, paulmck@...nel.org,
        mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com,
        Randy Dunlap <rdunlap@...radead.org>, oneukum@...e.com,
        anshuman.khandual@....com, jroedel@...e.de,
        Mina Almasry <almasrymina@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oscar Salvador <osalvador@...e.de>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        Xiongchun duan <duanxiongchun@...edance.com>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [External] Re: [PATCH v5 03/21] mm/hugetlb: Introduce a new
 config HUGETLB_PAGE_FREE_VMEMMAP

On Fri, Nov 20, 2020 at 4:47 PM Michal Hocko <mhocko@...e.com> wrote:
>
> On Fri 20-11-20 16:35:16, Muchun Song wrote:
> [...]
> > > That being said, unless there are huge advantages to introduce a
> > > config option I would rather not add it because our config space is huge
> > > already and the more we add the more future code maintainance that will
> > > add. If you want the config just for dependency checks then fine by me.
> >
> > Yeah, it is only for dependency checks :)
>
> OK, I must have misread the definition to think that it requires user to
> enable explicitly.
>
> Anyway this feature cannot be really on by default due to overhead. So
> the command line option default has to be flipped.

Got it. Thanks for your suggestion.

>
> --
> Michal Hocko
> SUSE Labs



-- 
Yours,
Muchun