[PATCH] Add Prefer_MAP_32BIT_EXEC for Silvermont

[Zack Weinberg]

On Fri, Dec 11, 2015 at 4:25 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Fri, Dec 11, 2015 at 1:16 PM, Zack Weinberg <zackw@panix.com> wrote:
>>
>>> Also 3% (likely more in other workloads) is a significant performance
>>> difference, especially when we're talking about something as common as
>>> function calls.
>>
>> I saw a claim of 3% *overall* performance increase on an artificial
>> benchmark and that's all.  I currently suspect this will turn out to
>> be unmeasurable on realistic workloads.
>
> 3% speedup is for my typical workloads, which is running GCC.

You can opt in in your development environment; equally you can switch
ASLR off altogether.

The "realistic workloads" I care about are long-lived network clients
and servers -- you know, the things for which ASLR is relevant as a
security measure.

zw