On Fri, 6 Apr 2001, Mark Hahn wrote:
> note, though, that you *CAN* actually malloc a lot more than 1G: you
> just have to avoid causing mmaps that chop your VM at
> TASK_UNMAPPED_BASE:
Neat trick. I didn't realize that you could avoid allocating the mmap()
buffers for stdin and stdout.
As was pointed out to me in January, another solution for i386 would be to
fix a maximum stack size and have the mmap() allocations grow downward
from the "top" of the stack (3GB - max stack size). I'm not sure why that
is not currently done.
I once wrote a tiny patch to do this, and ran it successfully for a couple
days, but knowing so little about the kernel I probably did it in a
completely wrong, inefficient way. For example, some of the vma
structures are sorted in increasing address order, and so perhaps to do
this properly one should change them to decreasing address order.
Cheers,
Wayne
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Apr 07 2001 - 21:00:18 EST