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  • Willy Tarreau's avatar
    leds: ledtrig-activity: Add a system activity LED trigger · 7df4f9a9
    Willy Tarreau authored
    
    
    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: default avatarWilly Tarreau <w@1wt.eu>
    Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
    7df4f9a9