• Stephane Eranian's avatar
    [PATCH] i386: add idle notifier · 2ff2d3d7
    Stephane Eranian authored
    Add a notifier mechanism to the low level idle loop.  You can register a
    callback function which gets invoked on entry and exit from the low level idle
    loop.  The low level idle loop is defined as the polling loop, low-power call,
    or the mwait instruction.  Interrupts processed by the idle thread are not
    considered part of the low level loop.
    
    The notifier can be used to measure precisely how much is spent in useless
    execution (or low power mode).  The perfmon subsystem uses it to turn on/off
    monitoring.
    Signed-off-by: default avatarstephane eranian <eranian@hpl.hp.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarAndi Kleen <ak@suse.de>
    2ff2d3d7
p4.c 6.58 KB