Waiman reported that on large systems with a large amount of interrupts the readout of /proc/stat takes a long time to sum up the interrupt statistics. In principle this is not a problem. but for unknown reasons some enterprise quality software reads /proc/stat with a high frequency. The reason for this is that interrupt statistics are accounted per cpu. So the /proc/stat logic has to sum up the interrupt stats for each interrupt. The following series addresses this by making the interrupt statitics code in the core generate the sum directly and by making the loop in the /proc/stat read function smarter. Thanks, tglx 8<---------------- fs/proc/stat.c | 28 +++++++++++++++++++++++++--- include/linux/irqdesc.h | 3 ++- kernel/irq/chip.c | 12 ++++++++++-- kernel/irq/internals.h | 8 +++++++- kernel/irq/irqdesc.c | 7 ++++++- 5 files changed, 50 insertions(+), 8 deletions(-)
