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Ka Ho Ng authored
This implements fspacectl(2) support on shared memory objects. The semantic of SPACECTL_DEALLOC is equivalent to clearing the backing store and free the pages within the affected range. If the call succeeds, subsequent reads on the affected range return all zero. tests/sys/posixshm/posixshm_tests.c is expanded to include a fspacectl(2) functional test. Sponsored by: The FreeBSD Foundation Reviewed by: kevans, kib Differential Revision: https://reviews.freebsd.org/D31490
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