Commit coalescing for micro-journal based transaction logging

A non-transitory computer readable storage medium having stored thereon program code executable by a computer system, the program code embodying a method for using commit coalescing when performing micro-journal-based transaction logging, the method comprising:

• maintaining, in a volatile memory of the computer system, a globally ascending identifier and a first list of free micro-journals, each micro-journal in the first list being stored in a byte-addressable persistent memory of the computer system and being configured to record journal entries for a single transaction at a time;
• receiving a transaction comprising one or more modifications to data or metadata stored in the byte-addressable persistent memory;
• selecting a micro-journal from the first list;
• obtaining a lock on the globally ascending identifier and writing a current value of the globally ascending identifier as a journal commit identifier into the micro-journal;
• writing journal entries into the micro-journal corresponding to the one or more modifications included in the transaction;
• and
• committing the micro-journal to the byte-addressable persistent memory.

A computer system comprising:

• a processor;
• a volatile memory;
• a byte-addressable persistent memory;
• and
• a non-transitory computer readable medium having stored thereon program code for implementing commit coalescing when performing micro-journal-based transaction logging, the program code causing the processor to:
• maintain, in the volatile memory, a globally ascending identifier and a first list of free micro-journals, each micro-journal in the first list being stored in the byte-addressable persistent memory and being configured to record journal entries for a single transaction at a time;
• receive a transaction comprising one or more modifications to data or metadata stored in the byte-addressable persistent memory;
• select a micro-journal from the first list;
• obtain a lock on the globally ascending identifier and write a current value of the globally ascending identifier as a journal commit identifier into the micro-journal;
• write journal entries into the micro-journal corresponding to the one or more modifications included in the transaction;
• and
• commit the micro-journal to the byte-addressable persistent memory.