linux-kernel - Re: [PATCH v6 00/15] mm: folio_zero

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Message-ID: <87tt17ide6.fsf@oracle.com>
Date: Fri, 12 Sep 2025 14:12:17 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org, akpm@...ux-foundation.org,
        david@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, mingo@...hat.com, mjguzik@...il.com, luto@...nel.org,
        peterz@...radead.org, namhyung@...nel.org, tglx@...utronix.de,
        willy@...radead.org, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH v6 00/15] mm: folio_zero_user: clear contiguous pages


Arnaldo Carvalho de Melo <acme@...nel.org> writes:

> On Tue, Sep 02, 2025 at 01:08:01AM -0700, Ankur Arora wrote:
>> This series adds clearing of contiguous page ranges for hugepages,
>> improving on the current page-at-a-time approach in two ways:
>>
>>  - amortizes the per-page setup cost over a larger extent
>>
>>  - when using string instructions, exposes the real region size
>>    to the processor.
>>
>> A processor could use a knowledge of the extent to optimize the
>> clearing.  AMD Zen uarchs, as an example, elide allocation of
>> cachelines for regions larger than L3-size.
>>
>> Demand faulting a 64GB region shows performance improvements:
>>
>>  $ perf bench mem map -p $pg-sz -f demand -s 64GB -l 5
>
> So, can I go ahead and pull the tools/perf/ bits into perf-tools-next,
> Namhyung already reviewed it, the rest can go thru the relevant
> channels, ok?

Sounds great. I think I have Namhyung's R-by on all but patches 6 and 9.

Thanks!

--
ankur