lkml.org 
[lkml]   [2020]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH v3 0/2] irqchip/gic-v3-its: Balance LPI affinity across CPUs
    Date
    When mapping a LPI, the ITS driver picks the first possible
    affinity, which is in most cases CPU0, assuming that if
    that's not suitable, someone will come and set the affinity
    to something more interesting.

    It apparently isn't the case, and people complain of poor
    performance when many interrupts are glued to the same CPU.
    So let's place the interrupts by finding the "least loaded"
    CPU (that is, the one that has the fewer LPIs mapped to it).
    So called 'managed' interrupts are an interesting case where
    the affinity is actually dictated by the kernel itself, and
    we should honor this.

    * From v2:
    - Split accounting from CPU selection
    - Track managed and unmanaged interrupts separately

    Marc Zyngier (2):
    irqchip/gic-v3-its: Track LPI distribution on a per CPU basis
    irqchip/gic-v3-its: Balance initial LPI affinity across CPUs

    drivers/irqchip/irq-gic-v3-its.c | 153 +++++++++++++++++++++++++------
    1 file changed, 127 insertions(+), 26 deletions(-)

    --
    2.20.1

    \
     
     \ /
      Last update: 2020-03-16 12:55    [W:4.938 / U:0.040 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site