On 08/02/2019 13:48, 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. > > V1 -> V2: Address review feedback: undo struct layout changes, make > variables unsigned and add test results to the changelog. > > Thanks, > > tglx > > 8<---------------- > fs/proc/stat.c | 29 ++++++++++++++++++++++++++--- > include/linux/irqdesc.h | 1 + > kernel/irq/chip.c | 12 ++++++++++-- > kernel/irq/internals.h | 8 +++++++- > kernel/irq/irqdesc.c | 7 ++++++- > 5 files changed, 50 insertions(+), 7 deletions(-) > Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx> Thanks, M. -- Jazz is not dead. It just smells funny...
