linux-kernel - Re: [PATCH v6 5/6] mm: secretmem: use PMD-size pages to amortize direct map fragmentation

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Message-ID: <20200930104339.GK2611@hirez.programming.kicks-ass.net>
Date:   Wed, 30 Sep 2020 12:43:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Idan Yaniv <idan.yaniv@....com>,
        Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Shuah Khan <shuah@...nel.org>, Tycho Andersen <tycho@...ho.ws>,
        Will Deacon <will@...nel.org>, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-riscv@...ts.infradead.org,
        x86@...nel.org, songliubraving@...com
Subject: Re: [PATCH v6 5/6] mm: secretmem: use PMD-size pages to amortize
 direct map fragmentation

On Wed, Sep 30, 2020 at 01:20:31PM +0300, Mike Rapoport wrote:

> I tried to dig the regression report in the mailing list, and the best I
> could find is
> 
> https://lore.kernel.org/lkml/20190823052335.572133-1-songliubraving@fb.com/
> 
> which does not mention the actual performance regression but it only
> complaints about kernel text mapping being split into 4K pages.
> 
> Any chance you have the regression report handy? 

I think the saga started here:

 20190820075128.2912224-1-songliubraving@...com
 20190820202314.1083149-1-songliubraving@...com
 20190823052335.572133-1-songliubraving@...com

After that Thomas did the patch I referred to earlier and I endeavoured
to rewrite x86-ftrace.

I added Song to CC, maybe he can remember more.