linux-kernel - Re: [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature

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Message-ID: <20200324150155.GH20713@hirez.programming.kicks-ass.net>
Date:   Tue, 24 Mar 2020 16:01:55 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Zhenyu Ye <yezhenyu2@...wei.com>
Cc:     will@...nel.org, mark.rutland@....com, 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-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, arm@...nel.org,
        xiexiangyou@...wei.com, prime.zeng@...ilicon.com,
        zhangshaokun@...ilicon.com
Subject: Re: [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature

On Tue, Mar 24, 2020 at 09:45:28PM +0800, Zhenyu Ye wrote:
> 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.  This series provide support for this feature. 
> 
> Patch 1 and Patch 2 was provided by Marc on his NV series[1] patches,
> which detect the TTL feature and add __tlbi_level interface.

I realy hate how it makes vma->vm_flags more important for tlbi.