Re: MigShm Cache consistancy

Ratna

Very interesting. Is it for 2.6.15? How do you deal with true and  
false sharing?

Moshe


On Feb 2, 2006, at 2:11 AM, Ratna Manoj Bolla wrote:

>
> 	I am implementing a new MigShm patch.
>
> 	Advantages include it.. :
> 		1. will not depend on the application program semaphore locking.
> 		2. works at the granularity level of PAGE_SIZE.
> 		3. works for shared file mapping also .. there will not be  
> DSTAY_FOR_MONKEY flag in the source tree.
>
> 	I will post the patch soon.
>
> -Ratna Manoj Bolla.
>
> On Wed, 1 Feb 2006, Moshe Bar wrote:
>
>> I agree with Jason that mighsm is not there yet. Cristiano, are  
>> you still on it?
>>
>> Moshe
>>
>>
>> On Feb 1, 2006, at 9:40 AM, Jason Coutu wrote:
>>
>>> I've been beating my head around several issues with MigShm  
>>> recently.  At
>>> first I couldn't get it to work, even with rpm installs of  
>>> patched kernels.
>>> Eventually I got it to 'work' with the stress test that is  
>>> provided on the
>>> MigShm home page. And I thought I was home free, untill I noticed  
>>> that the
>>> semaphores in the stress test were all backwards, none of them  
>>> would halt a
>>> process when there was not enough resources because the ordering was
>>> backwards.  Until someone Is willing to step up and maintain MigShm
>>> (including fixing flushing, dirty cache, and semaphore issues) I  
>>> must
>>> recomend that it be dropped from any plans to include it in the next
>>> openMosix release.  The few applications that have benifited from  
>>> MigShm do
>>> not use semaphore locking or need tight cache consistancy.
>>> Jason Coutu
>>
>>
>>
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>
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