Hi Lukasz, On Fri, 17 Jul 2015 19:23:44 +0000, Odzioba, Lukasz wrote: > On Friday, July 17, 2015 8:02 PM Guenter Roeck wrote: > > Please explain why krealloc() won't work, why using krealloc(() would > > result in a larger memory footprint than using lists, and why disabling > > CPUs would require any action in the first place. > > It will work, but it can use more memory for cpus with many cores. > If you have just one core visible to the kernel with id 59 > (i.e. the rest are disabled by hardware) out of 60-core cpu then you > have to allocate an array of 60 pointers instead of just one element of Arrays of pointers are cheap. You can fit 512 pointers in a single memory page. > the list. Of course you can say that for cpu with just one core list will > use 3x the memory needed by array and that's true. I see no point in > arguing which case is more important, let's move on. I see the point in arguing: the example above is just silly and does not match any real-world application. Nobody buys a 60-core CPU to run it with a single core enabled. When you have two or more alternative implementations possible, thinking in terms of the most common cases is a key to make the right decision. Thinking about servers with a lots of CPU cores versus embedded devices with few cores and tight memory constraints, that is useful. Making up corner cases is not. -- Jean Delvare SUSE L3 Support _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
