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From: Christoph Hellwig <hch@lst.de>
To: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: hch@lst.de, robin.murphy@arm.com, vdumpa@nvidia.com,
	linux@armlinux.org.uk, catalin.marinas@arm.com,
	will.deacon@arm.com, joro@8bytes.org, m.szyprowski@samsung.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	tony@atomide.com
Subject: Re: [PATCH v2 RFC/RFT 0/5] Save single pages from CMA area
Date: Wed, 27 Mar 2019 09:08:21 +0100	[thread overview]
Message-ID: <20190327080821.GB20336@lst.de> (raw)
In-Reply-To: <20190326230131.16275-1-nicoleotsuka@gmail.com>

On Tue, Mar 26, 2019 at 04:01:26PM -0700, Nicolin Chen wrote:
> This series of patches try to save single pages from CMA area bypassing
> all CMA single page alloctions and allocating normal pages instead, as
> all addresses within one single page are contiguous.
> 
> We had once applied the PATCH-5 but reverted it as actually not all the
> callers handled the fallback allocations. Per Robin's suggestion, let's
> stuff alloc_pages()/free_page() fallbacks to those callers before having
> PATCH-5.

Given the problems this has caused so far I'd like to see a good
explanation of why this optimization is so important that all the churn
is even worth it..

  parent reply	other threads:[~2019-03-27  8:08 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-26 23:01 Nicolin Chen
2019-03-26 23:01 ` [PATCH v2 RFC/RFT 1/5] ARM: dma-mapping: Add fallback normal page allocations Nicolin Chen
2019-04-24 15:06   ` Christoph Hellwig
2019-04-24 15:08     ` Christoph Hellwig
2019-04-24 18:33     ` Nicolin Chen
2019-04-24 19:26       ` Christoph Hellwig
2019-04-24 19:38         ` Nicolin Chen
2019-04-30 15:24         ` Catalin Marinas
2019-05-02 13:26           ` Christoph Hellwig
2019-04-26 20:21     ` Nicolin Chen
2019-04-26 20:25       ` Christoph Hellwig
2019-03-26 23:01 ` [PATCH v2 RFC/RFT 2/5] dma-remap: Run alloc_pages() on failure Nicolin Chen
2019-03-26 23:01 ` [PATCH v2 RFC/RFT 3/5] iommu: amd_iommu: Add fallback normal page allocations Nicolin Chen
2019-03-26 23:01 ` [PATCH v2 RFC/RFT 4/5] arm64: dma-mapping: " Nicolin Chen
2019-03-26 23:01 ` [PATCH v2 RFC/RFT 5/5] dma-contiguous: Do not allocate a single page from CMA area Nicolin Chen
2019-03-27  8:08 ` Christoph Hellwig [this message]
2019-03-27 18:42   ` [PATCH v2 RFC/RFT 0/5] Save single pages " Nicolin Chen

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