Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature

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To: Zhenyu Ye <yezhenyu2@xxxxxxxxxx>
Subject: Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 21 Apr 2020 09:53:46 -0700
Cc: peterz@xxxxxxxxxxxxx, mark.rutland@xxxxxxx, will@xxxxxxxxxx, catalin.marinas@xxxxxxx, aneesh.kumar@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, npiggin@xxxxxxxxx, arnd@xxxxxxxx, rostedt@xxxxxxxxxxx, maz@xxxxxxxxxx, suzuki.poulose@xxxxxxx, tglx@xxxxxxxxxxxxx, yuzhao@xxxxxxxxxx, Dave.Martin@xxxxxxx, steven.price@xxxxxxx, broonie@xxxxxxxxxx, guohanjun@xxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xiexiangyou@xxxxxxxxxx, zhangshaokun@xxxxxxxxxxxxx, linux-mm@xxxxxxxxx, arm@xxxxxxxxxx, prime.zeng@xxxxxxxxxxxxx, kuhn.chenqun@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20200403090048.938-2-yezhenyu2@huawei.com>
References: <20200403090048.938-1-yezhenyu2@huawei.com> <20200403090048.938-2-yezhenyu2@huawei.com>

On Fri, Apr 03, 2020 at 05:00:43PM +0800, Zhenyu Ye wrote:
> From: Marc Zyngier <maz@xxxxxxxxxx>
> 
> In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL
> feature allows TLBs to be issued with a level allowing for quicker
> invalidation.

What does "issued with a level" mean?

Follow-Ups:
- Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature
  - From: Peter Zijlstra

References:
- [PATCH v1 0/6] arm64: tlb: add support for TTL feature
  - From: Zhenyu Ye
- [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature
  - From: Zhenyu Ye

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