In D36309#935684, @jlduran_gmail.com wrote:

Is there a reason why this change was not MFCd? Thank you!

In D40772#966842, @alc wrote:

In D40772#966839, @eugen_grosbein.net wrote:

Note this became more important since we have ASLR turned on for 64 bit processes since 13.2-RELEASE. And ASLR adds great deal of fragmentation. It leads to significant performance degradation over long run due to superpages becoming unusable due memory fragmentation.

Until a few months ago, the handling of anonymous memory allocations when ASLR is turned on was not really operating as intended. Over the summer, I fixed the biggest of the issues. Consequently, the behavior that I see now on CURRENT (and presumably 14) with ASLR on is no worse than with it off.

Note this became more important since we have ASLR turned on for 64 bit processes since 13.2-RELEASE. And ASLR adds great deal of fragmentation. It leads to significant performance degradation over long run due to superpages becoming unusable due memory fragmentation.

Fixed long time ago.