ALRU policy ‘Activity Threshold’ refer to per cache line or the whole cache?

[historyliao]

Question

The doc has specify staleness time is per cache line param that: Staleness Time - the time a cache line resides in the ALRU list before it can be cleaned (default: 120s). But 'Activity Threshold '- cache I/O activity time period, this means until the whole cache has no activity than this time threshold befor flush is executed? or per cache line?

Motivation

Your Environment

• OpenCAS version (commit hash or tag):
• Operating System:
• Kernel version:
• Cache device type (NAND/Optane/other):
• Core device type (HDD/SSD/other):
• Cache configuration:
• • Cache mode: (default: wt)
• • Cache line size: (default: 4)
• • Promotion policy: (default: always)
• • Cleaning policy: (default: alru)
• • Sequential cutoff policy: (default: full)
• Other (e.g. lsblk, casadm -P, casadm -L)