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Re: [Xen-devel] [PATCH 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently
- To: Nadav Amit <namit@xxxxxxxxxx>
- From: Dave Hansen <dave.hansen@xxxxxxxxx>
- Date: Tue, 25 Jun 2019 20:00:37 -0700
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- Cc: Sasha Levin <sashal@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "linux-hyperv@xxxxxxxxxxxxxxx" <linux-hyperv@xxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Delivery-date: Wed, 26 Jun 2019 04:23:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 6/25/19 7:35 PM, Nadav Amit wrote:
>>> const struct flush_tlb_info *f = info;
>>> + enum tlb_flush_reason reason;
>>> +
>>> + reason = (f->mm == NULL) ? TLB_LOCAL_SHOOTDOWN : TLB_LOCAL_MM_SHOOTDOWN;
>>
>> Should we just add the "reason" to flush_tlb_info? It's OK-ish to imply
>> it like this, but seems like it would be nicer and easier to track down
>> the origins of these things if we did this at the caller.
>
> I prefer not to. I want later to inline flush_tlb_info into the same
> cacheline that holds call_function_data. Increasing the size of
> flush_tlb_info for no good reason will not help…
Well, flush_tlb_info is at 6/8ths of a cacheline at the moment.
call_function_data is 3/8ths. To me, that means we have some slack in
the size.
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