linux-kernel - Re: [RFC PATCH 0/4] x86/mm/cpa: merge small mappings whenever possible

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Message-ID: <20220809175621.qq4ksi6zzqpon7e6@box>
Date:   Tue, 9 Aug 2022 20:56:21 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Aaron Lu <aaron.lu@...el.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Song Liu <song@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC PATCH 0/4] x86/mm/cpa: merge small mappings whenever
 possible

On Tue, Aug 09, 2022 at 10:58:18PM +0800, Aaron Lu wrote:
> Hi Kirill,
> 
> Thanks a lot for the feedback.
> 
> On 8/9/2022 6:04 PM, Kirill A. Shutemov wrote:
> > On Mon, Aug 08, 2022 at 10:56:45PM +0800, Aaron Lu wrote:
> >> This is an early RFC. While all reviews are welcome, reviewing this code
> >> now will be a waste of time for the x86 subsystem maintainers. I would,
> >> however, appreciate a preliminary review from the folks on the to and cc
> >> list. I'm posting it to the list in case anyone else is interested in
> >> seeing this early version.
> > 
> > Last time[1] I tried to merge pages back in direct mapping it lead to
> > substantial performance regression for some workloads. I cannot find the
> > report right now, but I remember it was something graphics related.
> >
> 
> Do you happen to remember the workload name? I can try running it.


No, sorry. As I said, I tried to find the report, but failed.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov