[PATCH] eal: zero out new added memory

[lic121]

On Tue, Aug 30, 2022 at 01:59:16PM +0300, Dmitry Kozlyuk wrote:
> Thank you for the most detailed info!
> 
> 1. If you run the poisoner program the second time,
>    does it also see dirty memory immediately after mmap()?

No, running the poisoner program again doesn't show dirty memory
immediately after mmap.

I assume that there are some differences on how my poisoner program
using hugepage and how testpmd using hugepage. I notice that testpmd
leaves some files under /dev/hugepages/rtemap_xxx even after testpmd
process exits. But my program didn't create any file under
/dev/hugepages/.
> 
> 2. Kernel 4.19.90-2102 patchlevel 2102 is very high,
>    can there be any unusual patches applied?
>    Your host has "compute" in its name,
>    can it have patches that trade security for performance?

I may need to talk to the kernel team. Indeed, I failed to reproduce the
issue on a Virtual Machine of kernel 4.18.0-305.12.1.el8_4.x86_64.(2M
page size insetad of 1G)