• Peter P Waskiewicz Jr's avatar
    genirq: Add CPU mask affinity hint · e7a297b0
    Peter P Waskiewicz Jr authored
    This patch adds a cpumask affinity hint to the irq_desc structure,
    along with a registration function and a read-only proc entry for each
    interrupt.
    
    This affinity_hint handle for each interrupt can be used by underlying
    drivers that need a better mechanism to control interrupt affinity.
    The underlying driver can register a cpumask for the interrupt, which
    will allow the driver to provide the CPU mask for the interrupt to
    anything that requests it.  The intent is to extend the userspace
    daemon, irqbalance, to help hint to it a preferred CPU mask to balance
    the interrupt into.
    
    [ tglx: Fixed compile warnings, added WARN_ON, made SMP only ]
    Signed-off-by: default avatarPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
    Cc: davem@davemloft.net
    Cc: arjan@linux.jf.intel.com
    Cc: bhutchings@solarflare.com
    LKML-Reference: <20100430214445.3992.41647.stgit@ppwaskie-hc2.jf.intel.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    e7a297b0
manage.c 28.6 KB