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From: Dave Hansen <dave.hansen@intel.com>
To: Nadav Amit <namit@vmware.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	the arch/x86 maintainers <x86@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Sasha Levin <sashal@kernel.org>, Juergen Gross <jgross@suse.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"virtualization@lists.linux-foundation.org" 
	<virtualization@lists.linux-foundation.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently
Date: Tue, 25 Jun 2019 20:00:37 -0700	[thread overview]
Message-ID: <88a76cb8-2484-818a-2be6-d06a4ffef107@intel.com> (raw)
In-Reply-To: <1545B936-7CEC-4A1C-B776-74004F774218@vmware.com>

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.


WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Nadav Amit <namit@vmware.com>
Cc: Sasha Levin <sashal@kernel.org>, Juergen Gross <jgross@suse.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"virtualization@lists.linux-foundation.org"
	<virtualization@lists.linux-foundation.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [Xen-devel] [PATCH 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently
Date: Tue, 25 Jun 2019 20:00:37 -0700	[thread overview]
Message-ID: <88a76cb8-2484-818a-2be6-d06a4ffef107@intel.com> (raw)
In-Reply-To: <1545B936-7CEC-4A1C-B776-74004F774218@vmware.com>

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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  reply	other threads:[~2019-06-26  3:00 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-13  6:48 [PATCH 0/9] x86: Concurrent TLB flushes and other improvements Nadav Amit
2019-06-13  6:48 ` [PATCH 1/9] smp: Remove smp_call_function() and on_each_cpu() return values Nadav Amit
2019-06-23 12:32   ` [tip:smp/hotplug] " tip-bot for Nadav Amit
2019-06-13  6:48 ` [PATCH 2/9] smp: Run functions concurrently in smp_call_function_many() Nadav Amit
2019-06-13  6:48 ` [PATCH 3/9] x86/mm/tlb: Refactor common code into flush_tlb_on_cpus() Nadav Amit
2019-06-25 21:07   ` Dave Hansen
2019-06-26  1:57     ` Nadav Amit
2019-06-13  6:48 ` [PATCH 4/9] x86/mm/tlb: Flush remote and local TLBs concurrently Nadav Amit
2019-06-13  6:48   ` [Xen-devel] " Nadav Amit
2019-06-13  6:48   ` Nadav Amit via Virtualization
2019-06-25 21:29   ` Dave Hansen
2019-06-25 21:29     ` [Xen-devel] " Dave Hansen
2019-06-25 21:29     ` Dave Hansen
2019-06-26  2:35     ` Nadav Amit
2019-06-26  2:35       ` [Xen-devel] " Nadav Amit
2019-06-26  3:00       ` Dave Hansen [this message]
2019-06-26  3:00         ` Dave Hansen
2019-06-26  3:32         ` Nadav Amit
2019-06-26  3:32           ` [Xen-devel] " Nadav Amit
2019-06-26  3:32           ` Nadav Amit via Virtualization
2019-06-26  3:00       ` Dave Hansen
2019-06-26  2:35     ` Nadav Amit via Virtualization
2019-06-26  3:36   ` Andy Lutomirski
2019-06-26  3:36     ` [Xen-devel] " Andy Lutomirski
2019-06-26  3:36     ` Andy Lutomirski
2019-06-26  3:48     ` Nadav Amit
2019-06-26  3:48       ` [Xen-devel] " Nadav Amit
2019-06-26  3:48       ` Nadav Amit via Virtualization
2019-06-26  3:51       ` Andy Lutomirski
2019-06-26  3:51       ` Andy Lutomirski
2019-06-26  3:51         ` [Xen-devel] " Andy Lutomirski
2019-06-13  6:48 ` [PATCH 5/9] x86/mm/tlb: Optimize local TLB flushes Nadav Amit
2019-06-25 21:36   ` Dave Hansen
2019-06-26 16:33     ` Andy Lutomirski
2019-06-26 16:39       ` Nadav Amit
2019-06-26 16:50         ` Andy Lutomirski
2019-06-13  6:48 ` [PATCH 6/9] KVM: x86: Provide paravirtualized flush_tlb_multi() Nadav Amit
2019-06-25 21:40   ` Dave Hansen
2019-06-26  2:39     ` Nadav Amit
2019-06-26  3:35       ` Andy Lutomirski
2019-06-26  3:41         ` Nadav Amit
2019-06-26  3:56           ` Andy Lutomirski
2019-06-26  6:30             ` Nadav Amit
2019-06-26 16:37               ` Andy Lutomirski
2019-06-26 17:41                 ` Vitaly Kuznetsov
2019-06-26 18:21                   ` Andy Lutomirski
2019-06-13  6:48 ` [PATCH 7/9] smp: Do not mark call_function_data as shared Nadav Amit
2019-06-23 12:31   ` [tip:smp/hotplug] " tip-bot for Nadav Amit
2019-06-13  6:48 ` [PATCH 8/9] x86/tlb: Privatize cpu_tlbstate Nadav Amit
2019-06-14 15:58   ` Sean Christopherson
2019-06-17 17:10     ` Nadav Amit
2019-06-25 21:52   ` Dave Hansen
2019-06-26  1:22     ` Nadav Amit
2019-06-26  3:57     ` Andy Lutomirski
2019-06-13  6:48 ` [PATCH 9/9] x86/apic: Use non-atomic operations when possible Nadav Amit
2019-06-23 12:16   ` [tip:x86/apic] " tip-bot for Nadav Amit
2019-06-25 21:58   ` [PATCH 9/9] " Dave Hansen
2019-06-25 22:03     ` Thomas Gleixner
2019-06-23 12:37 ` [PATCH 0/9] x86: Concurrent TLB flushes and other improvements Thomas Gleixner
2019-06-25 22:02 ` Dave Hansen
2019-06-26  1:34   ` Nadav Amit

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