Systems and methods for mixed directory entry organization in probe filter

A system comprising:

• a first processing node including one or more processors and a cache subsystem;
• and
• a probe filter directory having entries for tracking a plurality of memory locations wherein data stored at the plurality of memory locations are cached in the cache subsystem, the probe filter directory including:
• a first entry for tracking a first memory location of the plurality of memory locations, the first entry taking up a first number of bits;
• and
• a second entry for tracking a second memory location of the plurality of memory locations, the second entry taking up a second number of bits,
• wherein the first number of bits is larger than the second number of bits.

A method comprising:

• constructing a first entry of a probe filter directory for tracking a first memory location in a memory, the first entry taking up a first number of bits;
• and
• constructing a second entry of the probe filter directory for tracking a second memory location in the memory, the second entry taking up a second number of bits,
• wherein the first number of bits is larger than the second number of bits and data stored at the first and second memory location in the memory are cached in a cache subsystem.