Re: [PATCH v4 03/16] mm: Batch-clear PTE ranges during zap_pte_range()

From: Alistair Popple <apopple@nvidia.com>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Matthew Wilcox <willy@infradead.org>, Yu Zhao <yuzhao@google.com>,
	Mark Rutland <mark.rutland@arm.com>,
	David Hildenbrand <david@redhat.com>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	John Hubbard <jhubbard@nvidia.com>, Zi Yan <ziy@nvidia.com>,
	Barry Song <21cnbao@gmail.com>, Yang Shi <shy828301@gmail.com>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 03/16] mm: Batch-clear PTE ranges during zap_pte_range()
Date: Wed, 20 Dec 2023 16:25:07 +1100	[thread overview]
Message-ID: <87zfy5zbmu.fsf@nvdebian.thelocal> (raw)
In-Reply-To: <20231218105100.172635-4-ryan.roberts@arm.com>

Ryan Roberts <ryan.roberts@arm.com> writes:

[...]

> diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
> index 4f559f4ddd21..39725756e6bf 100644
> --- a/mm/mmu_gather.c
> +++ b/mm/mmu_gather.c
> @@ -47,6 +47,21 @@ static bool tlb_next_batch(struct mmu_gather *tlb)
>  	return true;
>  }
>  
> +unsigned int tlb_reserve_space(struct mmu_gather *tlb, unsigned int nr)
> +{
> +	struct mmu_gather_batch *batch = tlb->active;
> +	unsigned int nr_alloc = batch->max - batch->nr;
> +
> +	while (nr_alloc < nr) {
> +		if (!tlb_next_batch(tlb))
> +			break;
> +		nr_alloc += tlb->active->max;
> +	}
> +
> +	tlb->active = batch;
> +	return nr_alloc;
> +}

Agree this addresses my previous comment nicely, so you can add:

Reviewed-by: Alistair Popple <apopple@nvidia.com>

> +
>  #ifdef CONFIG_SMP
>  static void tlb_flush_rmap_batch(struct mmu_gather_batch *batch, struct vm_area_struct *vma)
>  {

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