Re: [Lse-tech] contention for mm->page_table_lock in large address space, multithreaded programs

[Ray B. <ra...@sg...>]

<<Watch this space>>

At the moment, I don't have access to a 2.6 for Altix that is stable enough to run this test, but when we get one that 
does, I will retest and see.

Andrew Morton wrote:
> Andi Kleen <ak...@su...> wrote:
> 
>>>That's what 2.4 does do, effectively.  swap_out_mm() takes the mm's
>>
>> > page_table_lock and hangs onto it for dear life.
>>
>> Hmm, I had heavy contention. I did some profiling and roughly 30% was
>> spent spinning on the lock and 70% processing or sending IPIs.
> 
> 
> Well rmap changes that stuff completely, so the first step is to verify
> that 2.6 actually has a problem.
> 
> 
> 
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> Lse-tech mailing list
> Lse...@li...
> https://lists.sourceforge.net/lists/listinfo/lse-tech
> 

-- 
Best Regards,
Ray
-----------------------------------------------
                   Ray Bryant
512-453-9679 (work)         512-507-7807 (cell)
ra...@sg...             ra...@au...
The box said: "Requires Windows 98 or better",
            so I installed Linux.
-----------------------------------------------