linux-kernel - Re: [PATCH v4 5/7] x86/tlb: add tlb flush all factor for specific CPU

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Message-ID: <4FAC6243.9050500@intel.com>
Date:	Fri, 11 May 2012 08:50:11 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Borislav Petkov <bp@...64.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, rob@...dley.net,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, arnd@...db.de,
	rostedt@...dmis.org, fweisbec@...il.com, jeremy@...p.org,
	gregkh@...uxfoundation.org, borislav.petkov@....com,
	riel@...hat.com, luto@....edu, avi@...hat.com, len.brown@...el.com,
	dhowells@...hat.com, fenghua.yu@...el.com, ak@...ux.intel.com,
	cpw@....com, steiner@....com, akpm@...ux-foundation.org,
	penberg@...nel.org, hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	paul.gortmaker@...driver.com, trenn@...e.de, tj@...nel.org,
	oleg@...hat.com, axboe@...nel.dk, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/7] x86/tlb: add tlb flush all factor for specific
 CPU

On 05/10/2012 06:42 PM, Borislav Petkov wrote:

> On Thu, May 10, 2012 at 11:38:35AM +0200, Peter Zijlstra wrote:
>> On Thu, 2012-05-10 at 13:00 +0800, Alex Shi wrote:
>>
>>
>>> +void intel_tlb_flushall_factor_set(struct cpuinfo_x86 *c)
>>> +{
>>> +       if (!cpu_has_invlpg) {
>>> +               tlb_flushall_factor = -1;
>>> +               return;
>>> +       }
>>
>> ...
>>
>>> +       if (!cpu_has_invlpg || vma->vm_flags & VM_HUGETLB
>>> +                       || tlb_flushall_factor == (u16)TLB_FLUSH_ALL)
>>> {
>>>  flush_all: 
>>
>> Since you set tlb_flushall_factor (I'd have called it _shift)
> 
> Seconded, tlb_flushall_shift makes more sense, considering how it is
> being used.


OK. I will change the name.

> 
>> to -1 when !invlpg there's a redundant check in there.
> 


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