[Bug other/50636] GC in large LTO builds cause excessive fragmentation in memory map

[andi-gcc at firstfloor dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50636

--- Comment #3 from Andi Kleen <andi-gcc at firstfloor dot org> 2011-10-06 21:31:56 UTC ---
I would prefer to free in 2MB chunks if possible

I was experimenting with increasing the quire size from 1 to 2MB so that a
modern
kernel with transparent huge pages can always get a huge page.

If the freeing also happens in the same chunks the kernel can keep the 2MB
pages together.

But yes MADV_DONTNEED makes sense too.