sysfs
-
/proc/sysrq-trigger
-
/sys/block/mmcblk0/mmcblk0p2/ro
-
/proc/pressure - PSI - Pressure Stall Information - v4.20 - Facebook 2018
- io
- cpu
- memory
-
/sys/fs/cgroup/cg1/io.pressure
-
CONFIG_PSI=y
-
CONFIG_PSI_DEFAULT_DISABLED=y
- psi=1
cat /boot/config-lts | grep PSI
for_each_possible_cpu(cpu)
nr_active += cpu_of(cpu)->nr_running + cpu_of(cpu)->nr_uninterruptible;
avenrun[n] = avenrun[0] * exp_n + nr_active * (1 - exp_n)
- avg10、avg60、avg300 分别代表 10s、60s、300s 的时间周期内的阻塞时间百分比。total 是总累计时间，以毫秒为单位。
- https://facebookmicrosites.github.io/psi/docs/overview
- https://www.kernel.org/doc/html/latest/accounting/psi.html
- https://lwn.net/Articles/759658/
- https://lwn.net/Articles/759781/
find /sys -type f -name power_now 2>/dev/null
sensors power_meter-acpi-0
/proc/acpi/battery/BAT0/state /sys/bus/acpi/drivers/battery/PNP0C0A:00/power_supply/BAT0/power_now
tlp-stat -b --- TLP 1.1 --------------------------------------------
+++ Battery Status /sys/class/power_supply/BAT1/manufacturer = SANYO /sys/class/power_supply/BAT1/model_name = L12S3F01 /sys/class/power_supply/BAT1/cycle_count = 16 /sys/class/power_supply/BAT1/energy_full_design = 32560 [mWh] /sys/class/power_supply/BAT1/energy_full = 16180 [mWh] /sys/class/power_supply/BAT1/energy_now = 16090 [mWh] /sys/class/power_supply/BAT1/power_now = 0 [mW] /sys/class/power_supply/BAT1/status = Unknown
Charge = 99.4 [%] Capacity = 49.7 [%]
modprobe i2c-dev sensors-detect
/sys/kernel
- /sys/kernel/debug
- /sys/kernel/security
- securityfs
- /proc/sys/kernel/hotplug
- /sys/kernel/config
- /sys/firmware/efi/efivars
- /sys/fs/pstore
- /etc/init.d/sysfs
modprobe configfs
grep "configfs$" /proc/filesystems
mount -n -t configfs -o nodev,noexec,nosuid configfs /sys/kernel/config
oom
/proc/self/oom_score- oom_score_adj
- /proc/sys/vm/overcommit_memory
- 2 - 不 overcommit - 不会 kill 而是返回错误
- vm.oom-kill
- panic_on_oom