Re: MigShm Cache consistancy

 	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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