linux-kernel - Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low

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Message-ID: <20220301115340.GA3077@lst.de>
Date:   Tue, 1 Mar 2022 12:53:40 +0100
From:   Christoph Hellwig <hch@....de>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, m.szyprowski@...sung.com,
        robin.murphy@....com, michael.h.kelley@...rosoft.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, vkuznets@...hat.com,
        brijesh.singh@....com, konrad.wilk@...cle.com,
        parri.andrea@...il.com, thomas.lendacky@....com,
        "krish.sadhukhan@...cle.com" <krish.sadhukhan@...cle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch

On Fri, Feb 25, 2022 at 10:28:54PM +0800, Tianyu Lan wrote:
>      One more perspective is that one device may have multiple queues and 
> each queues should have independent swiotlb bounce buffer to avoid spin 
> lock overhead. The number of queues is only available in the device
> driver. This means new API needs to be called in the device driver 
> according to queue number.

Well, given how hell bent people are on bounce buffering we might
need some scalability work there anyway.