Jed Davis 629eedfcfa Bug 1672085 - Don't pre-allocate when using memfd in IPC shared memory. r=glandium
Memory for memfd files isn't subject to any file size limit, unlike
named files in /dev/shm, and is documented as being handled similarly
to anonymous mmap for accounting / resource management purposes.
Therefore, there isn't any need to pre-commit the memory with
posix_fallocate in that case.

Differential Revision: https://phabricator.services.mozilla.com/D121818
2021-08-18 21:56:10 +00:00
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