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Re: [PATCH] Add statistical printout of rank_for_schedule decisions

On 08/03/14 22:51, Maxim Kuvyrkov wrote:
On Jul 17, 2014, at 5:34 AM, Jeff Law <> wrote:

On 07/13/14 22:17, Maxim Kuvyrkov wrote:

This patch adds dump printouts for scheduling heuristics in
rank_for_schedule.  Rank_for_schedule is one of the cornerstones of
haifa scheduler, yet its decisions are hard to track and debug.

This patch adds statistical gathering for each branch of
rank_for_schedule, and prints them out according to sched verbosity.
This patch helped me track down several bugs in rank_for_schedule
that result is stupid scheduling decisions.

Bootstrapped and tested on x86_64-linux-gnu.

OK to apply?
Presmably you use the

return increment, retval;

construct to avoid the need for braces?

I can see how it's useful here, but I don't think we've generally used comma operators like that and it's a style that I've never liked all that much.

Could you go ahead and split it into two statements and add the necessary braces? Approved with that change.

Code in rank_for_schedule is difficult to understand already, so I want to keep amount of "extra" code to a minimum.  How about for following instead: "return rfs_result (RFS_xxx, <return value>)" ?

Updated patch attached (the rest of the patch is unchanged).
Yea, that seems reasonable.  Good for the trunk.


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