The mount points detailed have been created intentionally by engineering.
In basic terms, they are a platform specific enhancement to ensure full
application performance is achieved. This is done by changing the way the
Operating System fully utilizes the potential of the CPU for the platform.
The libc_psr libraries implement platform-specific, optimized versions of
block copy and move routines from libc, such as memcpy(). On UltraSPARC
machines, these routines are coded in assembler, and use block load and
store ASI's, prefetch, and other tricks for better performance.
This is enabled using the HWCAP feature of the linker; see the linker
guide for details
Linker and Libraries Guide .
The alternate routines live in the libc_psr_hwcap1.so.1 library. At boot
time, the libc_psr_hwcap1.so.1 library is loop-back mounted onto the
libc_psr path using a combination of the moe(1) utility, and mount -F lofs,
invoked from the start method of the svc:/system/filesystem/root service
(/lib/svc/method/fs-root). As this is a loopback mount, no disk space is
waisted.
This is the only way that this enhancement can be implemented, and at this
time will not be changed. Disabling this functionality is not possible or
supported.