On Tue, 13 Feb 2018, Andrew Morton wrote: > > Both kernelcore= and movablecore= can be used to define the amount of > > ZONE_NORMAL and ZONE_MOVABLE on a system, respectively. This requires > > the system memory capacity to be known when specifying the command line, > > however. > > > > This introduces the ability to define both kernelcore= and movablecore= > > as a percentage of total system memory. This is convenient for systems > > software that wants to define the amount of ZONE_MOVABLE, for example, as > > a proportion of a system's memory rather than a hardcoded byte value. > > > > To define the percentage, the final character of the parameter should be > > a '%'. > > Is this fine-grained enough? We've had percentage-based tunables in > the past, and 10 years later when systems are vastly larger, 1% is too > much. > They still have the (current) ability to define the exact amount of bytes down to page sized granularity, whereas 1% would yield 40GB on a 4TB system. I'm not sure that people will want any finer-grained control if defining the proportion of the system for kernelcore. They do have the ability with the existing interface, though, if they want to be that precise. (This is a cop out for not implementing some fractional percentage parser, although that would be possible as a more complete solution.) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
