[PATCH] Remove volatile qualifiers from mt_allocator

[Paolo Carlini]

Richard Guenther wrote:

>We can "fix" that particular code by doing this adjustment
>
>        // Return this block to our list and update counters and
>        // owner id as needed.
>        --__bin._M_used[__block->_M_thread_id];
>
>only if __block->_M_thread_id == __thread_id as _M_used is only used to
>optimize reclaiming of thread-local free lists here:
>  
>
[snip]

and I think you are totally right! I was already considering that change 
myself (nothing in bugzilla, sorry), especially so when we noticed some 
time ago that an *unrelated* change that inadvertently amounted to the 
same effect apparently did work fine and didn't cause any major problem.

Are you willing to test it on a multiway machine? That would mean in 
particular running the performance testsuite before and after and 
studying the 23_containers numbers...

Thanks,
Paolo.