linux-kernel - Re: [PATCH v2] iommu/vt-d: Link cache tags of same iommu unit together

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Message-ID: <7fe65fd2-40db-45bc-aa18-953e9717b685@linux.intel.com>
Date: Thu, 2 Jan 2025 11:14:32 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Zhenzhong Duan <zhenzhong.duan@...el.com>, linux-kernel@...r.kernel.org,
 iommu@...ts.linux.dev
Cc: dwmw2@...radead.org, joro@...tes.org, will@...nel.org,
 robin.murphy@....com, yi.l.liu@...el.com, chao.p.peng@...el.com
Subject: Re: [PATCH v2] iommu/vt-d: Link cache tags of same iommu unit
 together

On 12/19/24 13:43, Zhenzhong Duan wrote:
> Cache tag invalidation requests for a domain are accumulated until a
> different iommu unit is found when traversing the cache_tags linked list.
> But cache tags of same iommu unit can be distributed in the linked list,
> this make batched flush less efficient. E.g., one device backed by iommu0
> is attached to a domain in between two devices attaching backed by iommu1.
> 
> Group cache tags together for same iommu unit in cache_tag_assign() to
> maximize the performance of batched flush.
> 
> Co-developed-by: Lu Baolu<baolu.lu@...ux.intel.com>
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> Signed-off-by: Zhenzhong Duan<zhenzhong.duan@...el.com>
> ---
> v2: avoid getting cache tag struct from list head (Baolu)
> 
>   drivers/iommu/intel/cache.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)

Queued for v6.14. Thanks!