From: Peter Zijlstra <peterz@infradead•org>
To: Zhenyu Ye <yezhenyu2@huawei•com>
Cc: mark.rutland@arm•com, catalin.marinas@arm•com,
linux-mm@kvack•org, guohanjun@huawei•com, will@kernel•org,
linux-arch@vger•kernel.org, yuzhao@google•com, maz@kernel•org,
steven.price@arm•com, arm@kernel•org, Dave.Martin@arm•com,
arnd@arndb•de, suzuki.poulose@arm•com, npiggin@gmail•com,
zhangshaokun@hisilicon•com, broonie@kernel•org,
rostedt@goodmis•org, prime.zeng@hisilicon•com,
tglx@linutronix•de, linux-arm-kernel@lists•infradead.org,
xiexiangyou@huawei•com, linux-kernel@vger•kernel.org,
aneesh.kumar@linux•ibm.com, akpm@linux-foundation•org
Subject: Re: Re: [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature
Date: Wed, 25 Mar 2020 14:32:01 +0100 [thread overview]
Message-ID: <20200325133201.GI20713@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <fb06ba92-a3ce-6925-e914-167a85837f27@huawei.com>
On Wed, Mar 25, 2020 at 12:49:45PM +0800, Zhenyu Ye wrote:
> Hi Peter,
>
> On 2020/3/24 23:01, Peter Zijlstra wrote:
> > 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.
> >
>
> Thanks for your review.
>
> The tlbi interfaces only have two parameters: vma and addr. If we
> try to not use vma->vm_flags, we may should have to add a parameter
> to some of these interfaces(such as flush_tlb_range), which are
> common to all architectures.
>
> I'm not sure if this is feasible, because this feature is only
> supported by ARM64 currently.
Power (p9-radix) also has level dependent invalidation instructions, so
at the very least you can hook them up as well.
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next prev parent reply other threads:[~2020-03-25 13:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 13:45 [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 1/6] arm64: Detect the ARMv8.4 " Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 2/6] arm64: Add level-hinted TLB invalidation helper Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 3/6] arm64: Add level-hinted TLB invalidation helper to tlbi_user Zhenyu Ye
2020-03-24 14:19 ` Marc Zyngier
2020-03-25 2:47 ` Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 4/6] mm: Add page table level flags to vm_flags Zhenyu Ye
2020-03-24 18:44 ` Steven Rostedt
2020-03-25 2:10 ` yezhenyu (A)
2020-03-24 13:45 ` [RFC PATCH v4 5/6] arm64: tlb: Use translation level hint in vm_flags Zhenyu Ye
2020-03-24 14:45 ` Marc Zyngier
2020-03-25 8:00 ` Zhenyu Ye
2020-03-25 14:13 ` Marc Zyngier
2020-03-26 7:11 ` Zhenyu Ye
2020-03-24 13:45 ` [RFC PATCH v4 6/6] mm: Set VM_LEVEL flags in some tlb_flush functions Zhenyu Ye
2020-03-24 15:01 ` [RFC PATCH v4 0/6] arm64: tlb: add support for TTL feature Peter Zijlstra
2020-03-25 4:49 ` Zhenyu Ye
2020-03-25 13:32 ` Peter Zijlstra [this message]
2020-03-26 7:15 ` Zhenyu Ye
2020-03-25 16:15 ` James Morse
2020-03-25 16:41 ` Peter Zijlstra
2020-03-26 6:45 ` Zhenyu Ye
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