Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:
> From a quick glance at the frame usage, some of it seems to be gcc
> being rather bad at stack allocation, but lots of it is just nasty
> spilling around the disgusting call-sites with tons or arguments. A
> _lot_ of the stack slots are marked as "%sfp" (which is gcc'ese for
> "spill frame pointer", afaik).
> Avoiding some inlining, and using a single flag value rather than the
> collection of "bool"s would probably help. But nothing really
> trivially obvious stands out.
One thing that may be worth playing around with gcc's
--param large-stack-frame and --param large-stack-frame-growth
This tells the inliner when to stop inlining when too much
stack would be used.
We use conserve stack I believe. So perhaps smaller values than 100
and 400 would make sense to try.
-fconserve-stack
Attempt to minimize stack usage. The compiler attempts to
use less stack space, even if that makes the program slower.
This option
implies setting the large-stack-frame parameter to 100 and
the large-stack-frame-growth parameter to 400.
-Andi
--
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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