[dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary hugepage zero-filling

[Xie, Huawei]

On 11/23/2015 12:07 PM, Stephen Hemminger wrote:
> On Mon, 23 Nov 2015 03:46:31 +0000
> "Xie, Huawei" <huawei.xie at intel.com> wrote:
>
>>> Why cannot we rely on the kernel zeroing the memory ?
>>> If that behavior were to change, then we can zero out the memory
>>> ourselves.  
>> It is undocumented kernel behavior. My opinion is if not a big burden,
>> zero out the needed memory ourselves, otherwise resort to this kernel
>> behavior.
> Really, I think it is more an oversight of missing documentation,
> the kernel has always (and will continue) to zero out memory that is given
> to a process. If it didn't it would be a massive security hole.
Agree. I believe this behavior will not change in future. For the
security issue, kernel could also set all bits like to 1. Just wonder if
this is best practice and whether there are other user space programs
rely on this behavior.