On Tue, 21 Jul 2009 14:56:51 -0700 Dave Hansen <dave@xxxxxxxxxxxxxxxxxx> wrote: > I've added some comments in the kerneldoc for the (newly renamed) alloc > function: > > * The maximum number of elements is currently the number of elements > * that can be stored in a page times the number of page pointers > * that we can fit in the base structure or (using integer math): > * > * (PAGE_SIZE/element_size) * (PAGE_SIZE-8)/sizeof(void *) > * > * Here's a table showing example capacities. Note that the maximum > * index that the get/put() functions is just nr_objects-1. > * > * Element size | Objects | Objects | > * PAGE_SIZE=4k | 32-bit | 64-bit | > * ----------------------------------| > * 1 byte | 4186112 | 2093056 | > * 2 bytes | 2093056 | 1046528 | > * 3 bytes | 1395030 | 697515 | > * 4 bytes | 1046528 | 523264 | > * 32 bytes | 130816 | 65408 | > * 33 bytes | 126728 | 63364 | > * 2048 bytes | 2044 | 10228 | > * 2049 bytes | 1022 | 511 | > * void * | 1046528 | 261632 | 4-bytes on 32-bit and 8-bytes on 64-bit are the most interesting ones (IMO). So what we're basically saying is "2MB on 64-bit". I wonder if that's enough for known likely callers. Hopefully it is. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
