leds: ledtrig-activity: Add a system activity LED trigger

Browse source

The "activity" trigger was inspired by the heartbeat one, but aims at
providing instant indication of the immediate CPU usage. Under idle
condition, it flashes 10ms every second. At 100% usage, it flashes
90ms every 100ms. The blinking frequency increases from 1 to 10 Hz
until either the load is high enough to saturate one CPU core or 50%
load is reached on a single-core system. Then past this point only the
duty cycle increases from 10 to 90%.

This results in a very visible activity reporting allowing one to
immediately tell whether a machine is under load or not, making it
quite suitable to be used in clusters.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

...

This commit is contained in:

Willy Tarreau 2017-08-28 20:44:51 +02:00 • committed by Jacek Anaszewski

parent 9e66317d3c

commit 7df4f9a9f0

3 changed files with 283 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

9

drivers/leds/trigger/Kconfig

View file

1

drivers/leds/trigger/Makefile

View file

273

drivers/leds/trigger/ledtrig-activity.c

View file