On 8/5/21 9:02 PM, Zi Yan wrote: > From: Zi Yan <ziy@xxxxxxxxxx> > +config SET_MAX_ORDER > + int "Set maximum order of buddy allocator" > + depends on SPARSEMEM_VMEMMAP && (ARCH_FORCE_MAX_ORDER = 0) > + range 11 255 > + default "11" > + help > + The kernel memory allocator divides physically contiguous memory > + blocks into "zones", where each zone is a power of two number of > + pages. This option selects the largest power of two that the kernel > + keeps in the memory allocator. If you need to allocate very large > + blocks of physically contiguous memory, then you may need to > + increase this value. > + > + This config option is actually maximum order plus one. For example, > + a value of 11 means that the largest free memory block is 2^10 pages. It's enough that it's confusing for the devs, we could spare the users and add +1 to the value they specify :) > config HAVE_MEMBLOCK_PHYS_MAP > bool > >
