linux-kernel - Re: [PATCH v2 3/3] x86: Support local_flush_tlb_kernel

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Message-ID: <4FB60A1F.4010202@kernel.org>
Date:	Fri, 18 May 2012 17:36:47 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	David Howells <dhowells@...hat.com>, x86@...nel.org,
	Nick Piggin <npiggin@...il.com>
Subject: Re: [PATCH v2 3/3] x86: Support local_flush_tlb_kernel_range

Hi Peter,

On 05/17/2012 11:51 PM, Peter Zijlstra wrote:

> On Thu, 2012-05-17 at 17:11 +0900, Minchan Kim wrote:
>>> +++ b/arch/x86/include/asm/tlbflush.h
>>> @@ -172,4 +172,16 @@ static inline void flush_tlb_kernel_range(unsigned long start,
>>>       flush_tlb_all();
>>>  }
>>>  
>>> +static inline void local_flush_tlb_kernel_range(unsigned long start,
>>> +             unsigned long end)
>>> +{
>>> +     if (cpu_has_invlpg) {
>>> +             while (start < end) {
>>> +                     __flush_tlb_single(start);
>>> +                     start += PAGE_SIZE;
>>> +             }
>>> +     } else
>>> +             local_flush_tlb();
>>> +}
> 
> 
> It would be much better if you wait for Alex Shi's patch to mature.
> doing the invlpg thing for ranges is not an unconditional win.


Thanks for the information. I will watch that patchset.
Thanks.

-- 
Kind regards,
Minchan Kim
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