Kevin Svetlitski ea5b7bea31 Add configuration option controlling DSS support
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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jemalloc is a general purpose malloc(3) implementation that emphasizes
fragmentation avoidance and scalable concurrency support.  jemalloc first came
into use as the FreeBSD libc allocator in 2005, and since then it has found its
way into numerous applications that rely on its predictable behavior.  In 2010
jemalloc development efforts broadened to include developer support features
such as heap profiling and extensive monitoring/tuning hooks.  Modern jemalloc
releases continue to be integrated back into FreeBSD, and therefore versatility
remains critical.  Ongoing development efforts trend toward making jemalloc
among the best allocators for a broad range of demanding applications, and
eliminating/mitigating weaknesses that have practical repercussions for real
world applications.

The COPYING file contains copyright and licensing information.

The INSTALL file contains information on how to configure, build, and install
jemalloc.

The ChangeLog file contains a brief summary of changes for each release.

URL: https://jemalloc.net/
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