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

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Message-ID: <20200421165346.GA11171@infradead.org>
Date:   Tue, 21 Apr 2020 09:53:46 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Zhenyu Ye <yezhenyu2@...wei.com>
Cc:     peterz@...radead.org, mark.rutland@....com, will@...nel.org,
        catalin.marinas@....com, aneesh.kumar@...ux.ibm.com,
        akpm@...ux-foundation.org, npiggin@...il.com, arnd@...db.de,
        rostedt@...dmis.org, maz@...nel.org, suzuki.poulose@....com,
        tglx@...utronix.de, yuzhao@...gle.com, Dave.Martin@....com,
        steven.price@....com, broonie@...nel.org, guohanjun@...wei.com,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        xiexiangyou@...wei.com, zhangshaokun@...ilicon.com,
        linux-mm@...ck.org, arm@...nel.org, prime.zeng@...ilicon.com,
        kuhn.chenqun@...wei.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature

On Fri, Apr 03, 2020 at 05:00:43PM +0800, Zhenyu Ye wrote:
> From: Marc Zyngier <maz@...nel.org>
> 
> 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?