On 01/30/2019 07:31 AM, Thomas Gleixner wrote: > 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(-) > > > For the whole series, Acked-by: Waiman Long <longman@xxxxxxxxxx>
