From: Nadav Amit <namit@vmware.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
the arch/x86 maintainers <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH v3 5/9] x86/mm/tlb: Privatize cpu_tlbstate
Date: Fri, 19 Jul 2019 18:54:00 +0000 [thread overview]
Message-ID: <92B64D24-04DD-45A6-86A4-758CD73E0909@vmware.com> (raw)
In-Reply-To: <5c4b7bd2-ea0e-dc8d-edbb-1b1b739b963e@intel.com>
> On Jul 19, 2019, at 11:48 AM, Dave Hansen <dave.hansen@intel.com> wrote:
>
> On 7/19/19 11:43 AM, Nadav Amit wrote:
>> Andy said that for the lazy tlb optimizations there might soon be more
>> shared state. If you prefer, I can move is_lazy outside of tlb_state, and
>> not set it in any alternative struct.
>
> I just wanted to make sure that we capture these rules:
>
> 1. If the data is only ever accessed on the "owning" CPU via
> this_cpu_*(), put it in 'tlb_state'.
> 2. If the data is read by other CPUs, put it in 'tlb_state_shared'.
>
> I actually like the idea of having two structs.
Yes, that’s exactly the idea. In the (1) case, we may even be able to mark
the struct with __thread qualifier, which IIRC would prevent memory barriers
from causing these values being reread.
next prev parent reply other threads:[~2019-07-19 18:54 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 0:58 [PATCH v3 0/9] x86: Concurrent TLB flushes Nadav Amit
2019-07-19 0:58 ` [PATCH v3 1/9] smp: Run functions concurrently in smp_call_function_many() Nadav Amit
2019-07-19 18:23 ` Dave Hansen
2019-07-22 18:16 ` Peter Zijlstra
2019-07-22 18:41 ` Nadav Amit
2019-07-22 19:34 ` Peter Zijlstra
2019-07-22 18:21 ` Peter Zijlstra
2019-07-22 18:34 ` Nadav Amit
2019-07-22 19:19 ` Peter Zijlstra
2019-07-22 18:37 ` Thomas Gleixner
2019-07-22 18:40 ` Nadav Amit
2019-07-22 18:51 ` Thomas Gleixner
2019-07-22 19:02 ` Nadav Amit
2019-07-25 12:36 ` Thomas Gleixner
2019-07-25 19:10 ` Nadav Amit
2019-07-19 0:58 ` [PATCH v3 2/9] x86/mm/tlb: Remove reason as argument for flush_tlb_func_local() Nadav Amit
2019-07-19 0:58 ` [PATCH v3 3/9] x86/mm/tlb: Open-code on_each_cpu_cond_mask() for tlb_is_not_lazy() Nadav Amit
2019-07-19 18:36 ` Dave Hansen
2019-07-19 18:41 ` Nadav Amit
2019-07-19 22:44 ` Joe Perches
2019-07-19 23:02 ` Nadav Amit
2019-07-22 18:27 ` Peter Zijlstra
2019-07-22 19:47 ` Rasmus Villemoes
2019-07-22 19:51 ` Nadav Amit
2019-07-19 0:58 ` [PATCH v3 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently Nadav Amit
2019-07-22 19:14 ` Peter Zijlstra
2019-07-22 19:27 ` Nadav Amit
2019-07-22 19:32 ` Peter Zijlstra
2019-07-26 7:28 ` Juergen Gross
2019-07-31 0:13 ` Michael Kelley
2019-07-19 0:58 ` [PATCH v3 5/9] x86/mm/tlb: Privatize cpu_tlbstate Nadav Amit
2019-07-19 18:38 ` Dave Hansen
2019-07-19 18:43 ` Nadav Amit
2019-07-19 18:48 ` Dave Hansen
2019-07-19 18:54 ` Nadav Amit [this message]
2019-07-20 13:58 ` Andy Lutomirski
2019-07-21 20:21 ` Nadav Amit
2019-07-19 0:58 ` [PATCH v3 6/9] x86/mm/tlb: Do not make is_lazy dirty for no reason Nadav Amit
2019-07-19 0:58 ` [PATCH v3 7/9] cpumask: Mark functions as pure Nadav Amit
2019-07-19 0:58 ` [PATCH v3 8/9] x86/mm/tlb: Remove UV special case Nadav Amit
2019-07-19 2:25 ` Mike Travis
2019-07-19 4:58 ` Nadav Amit
2019-07-31 3:11 ` Nadav Amit
2019-07-19 0:58 ` [PATCH v3 9/9] x86/mm/tlb: Remove unnecessary uses of the inline keyword Nadav Amit
2019-07-19 21:36 ` [PATCH v3 0/9] x86: Concurrent TLB flushes Dave Hansen
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