All tests passed 7238591f99132d8c0b223c144f21276e952c8e3f

map handle caching: Add API to disable map handle caching.

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All tests passed da688a15607c55359840a13ac844f185d2d7a069

Fix typo on Mac OS in last commit.

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All tests passed bcc600db9feb6aa50e0880422a071d0e39ae74aa

current_process_memory_usage: Better document what happens with inaccurate commit charge calculation on older Linux kernels.

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All tests passed c86f5a536072da82a73024ccd640efc11e1ce3d3

Fix use of iostream in last commit.

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All tests passed 8cec4ff8fcd601b774c0ed882fe869e73d23d136

map handle cache: Fix bug where adding a map to the cache was using the length not the reservation as the size.

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All tests passed 2917dc7799bc3be9c3fef406ccde21a273aeaffc

map_handle cache now looks to be working well.

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All tests passed 5fc220fb1d39da11c9d41fdd6611e4455cc22eba

Fix utils::current_process_memory() on Linux which could enter an infinite loop.

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All tests passed 044418de759c225ec72e43e6fe74ce2a5ab0fdaf

On POSIX stop map_handle::commit() calling madvise() on non-file backed allocations.

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All tests passed 41861766afcbfb412fc6b01a3ac794878dfcb7c5

Have `process_cpu_usage` be zero initialised on default construction.

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All tests passed 62f7b92749fdfe55b86236f0ff32b376004f3555

Try once again on passing CI on Mac.

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