On Wed, 30 Jan 2019, Andrew Morton wrote: > On Wed, 30 Jan 2019 13:31:30 +0100 Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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. > > > > Has the speedup been quantified? Waiman should be able to provide numbers
