• Peter Chubb's avatar
    [PATCH] ia64: greatly speed-up I/O-SAPIC irq_enable()/irq_disable() · ac2b25e8
    Peter Chubb authored
    This patch changes the I/O SAPIC code to cache the low 32 bits of the mask
    word in kernel memory.  This greatly speeds up mask_irq() and unmask_irq().
    
    Normally, these operations are not on the speed-critical path of the
    kernel but with certain devices drivers (including users-level device-
    drivers) they can become performance-critical.
    ac2b25e8
iosapic.c 20.4 KB