On Mon, 28 Nov 2016 13:50:37 -0800 Matthew Wilcox <mawilcox@xxxxxxxxxxxxxxxxx> wrote: > The IDR is very similar to the radix tree. It has some functionality > that the radix tree did not have (alloc next free, cyclic allocation, > a callback-based for_each, destroy tree), which is readily implementable > on top of the radix tree. A few small changes were needed in order to > use a tag to represent nodes with free space below them. > > The IDA is reimplemented as a client of the newly enhanced radix tree. > As in the current implementation, it uses a bitmap at the last level of > the tree. > > Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx> > --- > include/linux/idr.h | 132 ++-- > include/linux/radix-tree.h | 5 +- > init/main.c | 3 +- > lib/idr.c | 1078 ------------------------------- > lib/radix-tree.c | 632 ++++++++++++++++-- hm. It's just a cosmetic issue, but perhaps the idr wrappers-around-radix-tree code should be in a different .c file. Before: akpm3:/usr/src/25> size lib/idr.o lib/radix-tree.o text data bss dec hex filename 6566 89 16 6671 1a0f lib/idr.o 11811 117 8 11936 2ea0 lib/radix-tree.o After: text data bss dec hex filename 14151 118 8 14277 37c5 lib/radix-tree.o So 4500 bytes saved. Decent. -- 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>