linux-kernel - Re: [PATCH] mm/uffd: UFFD_FEATURE_WP

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Date:   Fri, 17 Feb 2023 18:10:10 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Axel Rasmussen <axelrasmussen@...gle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH] mm/uffd: UFFD_FEATURE_WP_ZEROPAGE

Hi, Muhammad,

On Fri, Feb 17, 2023 at 05:31:19PM +0500, Muhammad Usama Anjum wrote:
> I've just ran my single threaded selftest [1] over an over again to get
> some numbers.
> 
> Without zeropage
> qemu has 6 cores: 26.0355

Did you count in the time of read prefault?  Or did you not prefault at
all?

> With zeropage
> qemu has 6 cores: 39.203
> 
> 33% worse performance with zero pages
> 
> Definitely, there can be better benchmark application. Please let me know
> if I should write better benchmarks on my end.
> 
> [1]
> https://lore.kernel.org/all/20230202112915.867409-7-usama.anjum@collabora.com

I'll have a closer look too next week.

Thanks,

-- 
Peter Xu