[PATCH] Significantly reduce memory usage of genattrtab

[Bernd Edlinger]

Hi!

The genattrtab build-tool uses way too much memory in general.
I think there is no other build step that uses more memory.

On the currently trunk it takes around 700MB to build the
ARM latency tab files.  I debugged that yesterday
and found that this can be reduced to 8MB (!).  Yes, really.

So the attached patch does try really hard to hash and re-use
all ever created rtx objects.


Bootstrapped and reg-tested on x86_64-pc-linux-gnu and ARM.
Is it OK for trunk?


Thanks
Bernd.
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