I have finally managed to draft a JEP to formally present the proposal I circulated a month or two back regarding support for MappedByteBuffer access to non-volatile memory.
JEP JIRA: https://bugs.openjdk.java.net/browse/JDK-8207851 The JEP references a re-implementation of the proposed API: http://cr.openjdk.java.net/~adinn/pmem/webrev.01/ The rework addresses some of the feedback provided in the initial discussion: Previous Thread: (starts in May archive) http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-May/053317.html (continues into June archive at) http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-June/053673.html In particular, the re-implementation has split the original Hotspot intrinsic used to guarantee writeback an address range into 3 intrinsics relocated into class Unsafe which write back a single cache line perform any necessary memory sync pre-writeback perform any necessary memory sync post-writeback Also, the implementation has been extended from Linux on x86_64 to also coater for Linux on AArch64. The latter version compiles and generates correct code but has not yet been tested because I have not yet obtained access to a box with a suitably up to date kernel. Comments and suggestions for improvement would be very welcome. n.v. Jonathan Halliday is about to get his hands on an x86 box with a real NVM dimm so we may soon be able to try this out with NVM proper rather than testing with volatile memory pretending to be NVM. regards, Andrew Dinn ----------- Senior Principal Software Engineer Red Hat UK Ltd Registered in England and Wales under Company Registration No. 03798903 Directors: Michael Cunningham, Michael ("Mike") O'Neill, Eric Shander
