linux-kernel - Re: [PATCH v3 3/6] mm/vmscan: activate swap-backed executable folios after first usage

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Message-ID: <75adcfe33483d5e30855226b6efcd8dcd2f52925.camel@intel.com>
Date:   Wed, 27 Apr 2022 14:10:25 +0800
From:   "ying.huang@...el.com" <ying.huang@...el.com>
To:     Joonsoo Kim <js1304@...il.com>, Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Christoph Hellwig <hch@....de>,
        Oscar Salvador <osalvador@...e.de>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/6] mm/vmscan: activate swap-backed executable
 folios after first usage

On Wed, 2022-04-27 at 13:08 +0900, Joonsoo Kim wrote:
> Hello,
> 
> 2022년 4월 26일 (화) 오후 3:58, Miaohe Lin <linmiaohe@...wei.com>님이 작성:
> > 
> > On 2022/4/26 10:02, ying.huang@...el.com wrote:
> > > On Mon, 2022-04-25 at 14:07 -0700, Andrew Morton wrote:
> > > > On Mon, 25 Apr 2022 19:12:29 +0800 Miaohe Lin <linmiaohe@...wei.com> wrote:
> > > > 
> > > > > We should activate swap-backed executable folios (e.g. tmpfs) after first
> > > > > usage so that executable code gets yet better chance to stay in memory.
> 
> Missing activation for swap-backed executable page is the intended operation.
> So, I disagree with this patch until some numbers are provided.
> See following discussion.
> 
> https://lore.kernel.org/all/20200316161208.GB67986@cmpxchg.org/T/#u

Thanks for your pointer.  Now I understood more about this.  I agree to
keep the original behavior unless we can prove the change with numbers.

Best Regards,
Huang, Ying