linux-kernel - Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

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Date:   Fri, 21 Jul 2023 14:48:23 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, jean-philippe@...aro.org,
        jgg@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

> And since we have a group of subdomains that are simply indexed
> by ssids, perhaps we can add an xarray to store a subdomain ptr
> along with an ssid, replacing the list?

Hmmmm, I think the only place where we search through the list for a
specific SSID is during remove_dev_pasid. We mostly use the list to
iterate over  all the masters/ssids that this domain is attached to.
I'm not sure if moving to an xarray to optimize the remove_dev_pasid
call is worth it (at the cost of iterations which IIUC would become N
log(N))