linux-5.5_rc7: Set CONFIG_PSI=y

Collect metrics that indicate how overcommitted the CPU, memory,
and IO capacity are in the system.

If you say Y here, the kernel will create /proc/pressure/ with the
pressure statistics files cpu, memory, and io. These will indicate
the share of walltime in which some or all tasks in the system are
delayed due to contention of the respective resource.

In kernels with cgroup support, cgroups (cgroup2 only) will
have cpu.pressure, memory.pressure, and io.pressure files,
which aggregate pressure stalls for the grouped tasks only.

linux-5.5_rc7-316.bee

@@ -54,6 +54,7 @@ mee_configure() {
 	CONFIG_BSD_PROCESS_ACCT_V3=y
 	CONFIG_TASK_XACCT=y
 	CONFIG_TASK_IO_ACCOUNTING=y
+	CONFIG_PSI=y
 	CONFIG_IKCONFIG=y
 	CONFIG_IKCONFIG_PROC=y
 	CONFIG_CGROUPS=y