On Sat, 2016-07-16 at 10:57 +0300, Noam Camus wrote: > From: Noam Camus > > Today there are platforms with many CPUs (up to 4K). > Trying to boot only part of the CPUs may result in too long string. > > For example lets take NPS platform that is part of arch/arc. > This platform have SMP system with 256 cores each with > 16 HW threads (SMT machine) where HW thread appears as CPU to the kernel. > In this example there is total of 4K CPUs. > When one tries to boot only part of the HW threads from each core the > string representing the map may be long... > For example if for sake of performance we decided to boot only first half > of HW threads of each core the map will look like: > 0-7,16-23,32,39,...,4080-4087 > > This patch introduce new format to accommodate with such use case. > I added an optional postfix to a range of CPUs which will choose > according to given modulo the desired range of reminders i.e.: > %modulo= This is a fairly awful syntax, and I question whether it belongs in this generic code. [...] > + * Optionally each range can be postfixed to denote that only parts of it > + * should be set. The parts are the range of reminders modulo some value. > + * i.e. range%mod=rem_range e.g. 0-1023%256=0-2 ==> 0,1,256,257,512,513,768,769 [...] This example seems to be wrong - did you mean '=0-1'? Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.