[Bug translator/11695] DWIM promotion of ++ to <<<

[jistone at redhat dot com]

------- Additional Comments From jistone at redhat dot com  2010-06-11 15:52 -------
(In reply to comment #1)
> The aggregate doesn't need a global lock, it uses per-cpu counters.

It does have a lock, but the exclusiveness is inverted: <<< takes a read lock
and @extract takes a write lock.  You can think of it as locking the aggregate
structure, which you write to when @extracting data from the per-cpu structures.

So this transformation is only worthwhile when updating the value is more common
than reading it.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=11695

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