Re: [libgomp] task scheduler rewrite and task priorities implementation

[Aldy Hernandez <aldyh at redhat dot com>]

On 10/29/2015 08:46 AM, Aldy Hernandez wrote:
> Yo!
>
> As promised, here is the work implementing a new API for the task
> scheduler, rewriting the scheduler to fit into this new API, and
> implementing the task priorities that are in OpenMP > 4.1.  There are
> also lots of cleanups and documentation.

After some back and forth with Jakub, here is my final answer :).

I removed the priority_node allocation overhead in favor of keeping the 
data in gomp_task with some fancy offsetof() tricks.  There is now no 
measurable performance difference for the common case (0 priority tasks) 
in tweaked versions of nqueens-1.c, sort-1.c, and strassen.f90.

I also chased down a memory leak, but otherwise, the patch is mostly the 
same.

Tested on x86-64 Linux with 4 cores.

Approved by Jakub.

Committed to gomp-4_5-branch.  Jakub, I'm sure you can pull it from 
there to mainline when you deem appropriate.

Enjoy.
Aldy

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