Flexible sizing for data buffers

An apparatus, comprising:

• one or more computer readable storage media;
• a processing system operatively coupled with the one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media that, based on being read and executed by the processing system, direct the processing system to at least:
• establish a pool of available memory pages tracked by memory pointers for use in a data structure;
• process requests for storing data in the data structure to identify ones of the requests indicating data sizes that exceed a capacity of current pages included in the data structure;
• responsive to the ones of the requests, provide first pointers indicating start locations in the data structure to begin writing associated data, count information indicating quantities of the associated data able to be written in the current pages, and second pointers indicating at least one additional page in the data structure into which the associated data can be spanned from the current pages, wherein the at least one additional page is allocated from the pool of available memory pages for inclusion in the data structure in accordance with a fullness threshold for the data structure.