Add configuration option controlling DSS support #2476
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In many environments, the fallback `sbrk(2)` allocation path is never used even if the system supports the syscall; if you're at the point where `mmap(2)` is failing, `sbrk(2)` is unlikely to succeed. Without changing the default, I've added the ability to disable the usage of DSS altogether, so that you do not need to pay for the additional code size and handful of extra runtime branches in such environments.
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In many environments, the fallback
sbrk(2)allocation path is never used even if the system supports the syscall; if you're at the point wheremmap(2)is failing,sbrk(2)is unlikely to succeed. Without changing the default, I've added the ability to disable the usage of DSS altogether, so that you do not need to pay for the additional code size and handful of extra runtime branches in such environments.