PMDK Version 1.8

This release:

• Introduces new API in libpmemobj for user-assisted defragmentation (see pmemobj_defrag man page for details).
• Introduces experimental support for PPC64LE architecture.
• Introduces new flag in libpmemobj for opting-out of transaction aborts on failure (POBJ_TX_NO_ABORT), along with new variants of existing APIs that didn't accept flags (pmemobj_tx_xfree, pmemobj_tx_xpublish,
  pmemobj_tx_xlock, pmemobj_tx_xlog_append_buffer, pmemobj_tx_xstrdup, pmemobj_tx_xwcsdup).
• Moves out libvmem and libvmmalloc to the new repository (https://github.com/pmem/vmem).

libpmemobj on-media layout has not changed in this release, which means that pool conversion is not needed when updating PMDK from 1.7 to 1.8. pmdk-convert 1.8 will not be released.

Other changes:

• obj: introduce new statistics useful for defrag
• obj: introduce transient/persistent statistics enabling
• obj: introduce pmemobj_tx_(set/get)_user_data funcs
• obj: introduce pmemobj_(set/get)_user_data funcs
• obj: disable workaround for offsetof() since VS 15.5 in public header
• common: drop support for libndctl < 63 on Linux
• pool: rename -N --no-exec to -d --dry-run

Notable bug fixes:

• obj: fix zone size calculations (partial fix for #4528)
• obj: fix potential NULL-dereference in ulog_store
• obj: fix unintended recursive locking during palloc
• obj: fix lock release order in palloc publish
• obj: fix transient redo log of more than 64 entries
• obj: fix capacity ulog calculation
• obj: fix check of unaligned capacity size
• rpmem: add a missing case for GPSPM + FLUSH_STRICT
• pmem: fix pmemcheck support on platforms with eADR
• pool: fix possible memory leak
• rpmem: fix possible memory leak in rpmemd_config_read
• rpmem: fix possible memory leak in rpmemd_log_init
• rpmem: fix possible use-after-free

Known problems:

• obj: allocation is partially outside the pool (#4528)