Re: [PATCH 4/7] perf: Check if HT is supported and enabled

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From: H. Peter Anvin

Subject: Re: [PATCH 4/7] perf: Check if HT is supported and enabled

Date: Tuesday, January 4, 2011 - 12:00 pm

On 01/04/2011 05:58 AM, Peter Zijlstra wrote:
quoted text> On Tue, 2011-01-04 at 14:52 +0100, Stephane Eranian wrote:
>>
>> Couldn't you simply over-provision, and then when the CPU is online, use my
>> ht_enabled statement to figure out whether or not you need to handle the sharing
>> issue? 
> 
> That's pretty much what Lin's latest does:
> 
>  X86_FEATURE_HT && smp_num_siblings > 1
> 
> shows the CPU is capable of HT and will allocate the needed resources.
> 

From the sound of it, it doesn't seem like it's worth optimizing out the
fairly small memory allocation.

	-hpa

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Messages in current thread:

[PATCH 4/7] perf: Check if HT is supported and enabled, Lin Ming, (Mon Dec 27, 8:36 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Lin Ming, (Tue Dec 28, 1:51 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Peter Zijlstra, (Mon Jan 3, 3:58 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Andi Kleen, (Mon Jan 3, 8:21 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, H. Peter Anvin, (Mon Jan 3, 12:53 pm)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Peter Zijlstra, (Tue Jan 4, 4:10 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Stephane Eranian, (Tue Jan 4, 6:38 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Peter Zijlstra, (Tue Jan 4, 6:44 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Stephane Eranian, (Tue Jan 4, 6:52 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Peter Zijlstra, (Tue Jan 4, 6:58 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Stephane Eranian, (Tue Jan 4, 8:35 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, Valdis.Kletnieks, (Tue Jan 4, 11:55 am)

Re: [PATCH 4/7] perf: Check if HT is supported and enabled, H. Peter Anvin, (Tue Jan 4, 12:00 pm)


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