tree 85413b0197907da066eabcdabc3f1ff54913c980
parent aa622b822bcb834405e251d007525f49dc8bfd42
author Willy Tarreau <w@1wt.eu> 1611857966 +0100
committer Willy Tarreau <w@1wt.eu> 1611918633 +0100
encoding latin1

MINOR: activity: declare a new structure to collect per-function activity

The new sched_activity structure will be used to collect task-level
activity based on the target function. The principle is to declare a
large enough array to make collisions rare (256 entries), and hash
the function pointer using a reduced XXH to decide where to store the
stats. On first computation an entry is definitely assigned to the
array and it's done atomically. A special entry (0) is used to store
collisions ("others"). The goal is to make it easy and inexpensive for
the scheduler code to use these to store #calls, cpu_time and lat_time
for each task.