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Message-ID: <40889617-0820-473e-86ed-04eca6489169@redhat.com>
Date: Mon, 12 Feb 2024 14:46:29 +0100
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Subject: Re: [PATCH v5 23/25] arm64/mm: Implement pte_batch_hint()
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To: Ryan Roberts <ryan.roberts@arm.com>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>,
 Ard Biesheuvel <ardb@kernel.org>, Marc Zyngier <maz@kernel.org>,
 James Morse <james.morse@arm.com>, Andrey Ryabinin <ryabinin.a.a@gmail.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 Matthew Wilcox <willy@infradead.org>, Mark Rutland <mark.rutland@arm.com>,
 Kefeng Wang <wangkefeng.wang@huawei.com>, John Hubbard
 <jhubbard@nvidia.com>, Zi Yan <ziy@nvidia.com>,
 Barry Song <21cnbao@gmail.com>, Alistair Popple <apopple@nvidia.com>,
 Yang Shi <shy828301@gmail.com>, Nicholas Piggin <npiggin@gmail.com>,
 Christophe Leroy <christophe.leroy@csgroup.eu>,
 "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
 "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
 Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
 Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>,
 "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-arm-kernel@lists.infradead.org, x86@kernel.org,
 linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org
References: <20240202080756.1453939-1-ryan.roberts@arm.com>
 <20240202080756.1453939-24-ryan.roberts@arm.com>
From: David Hildenbrand <david@redhat.com>
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In-Reply-To: <20240202080756.1453939-24-ryan.roberts@arm.com>
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On 02.02.24 09:07, Ryan Roberts wrote:
> When core code iterates over a range of ptes and calls ptep_get() for
> each of them, if the range happens to cover contpte mappings, the number
> of pte reads becomes amplified by a factor of the number of PTEs in a
> contpte block. This is because for each call to ptep_get(), the
> implementation must read all of the ptes in the contpte block to which
> it belongs to gather the access and dirty bits.
> 
> This causes a hotspot for fork(), as well as operations that unmap
> memory such as munmap(), exit and madvise(MADV_DONTNEED). Fortunately we
> can fix this by implementing pte_batch_hint() which allows their
> iterators to skip getting the contpte tail ptes when gathering the batch
> of ptes to operate on. This results in the number of PTE reads returning
> to 1 per pte.
> 
> Tested-by: John Hubbard <jhubbard@nvidia.com>
> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
> ---
>   arch/arm64/include/asm/pgtable.h | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index ad04adb7b87f..353ea67b5d75 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -1220,6 +1220,15 @@ static inline void contpte_try_unfold(struct mm_struct *mm, unsigned long addr,
>   		__contpte_try_unfold(mm, addr, ptep, pte);
>   }
>   
> +#define pte_batch_hint pte_batch_hint
> +static inline unsigned int pte_batch_hint(pte_t *ptep, pte_t pte)
> +{
> +	if (!pte_valid_cont(pte))
> +		return 1;
> +
> +	return CONT_PTES - (((unsigned long)ptep >> 3) & (CONT_PTES - 1));
> +}
> +
>   /*
>    * The below functions constitute the public API that arm64 presents to the
>    * core-mm to manipulate PTE entries within their page tables (or at least this


Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb