From: Mike Rapoport <r...@linux.ibm.com> Hi,
It took me a while to get back to it, but better late than never :) This patch adds SPARSEMEM support as an alternative to DISCONTIGMEM in the case when there are two DRAM banks populated. I've verified that it boots on nsim, but I could not find a way to make nsim emulate two memory banks. There is slight improvement in the resulting kernel size for nsim_700_defconfig with CONFIG_HIGHMEM=y. If sparse actually works on a system with 2 DRAM banks and does not introduce performance regression, I suggest to update this patch to replace DISCONTIGMEM with SPARSEMEM on arc. $ size discontig/vmlinux sparse/vmlinux text data bss dec hex filename 3894379 1093092 244932 5232403 4fd713 discontig/vmlinux 3879040 1093964 244956 5217960 4f9ea8 sparse/vmlinux $ ./scripts/bloat-o-meter ~/tmp/arc/discontig/vmlinux ~/tmp/arc/sparse/vmlinux add/remove: 35/23 grow/shrink: 35/384 up/down: 8110/-26438 (-18328) ... Total: Before=4282217, After=4263889, chg -0.43% Mike Rapoport (1): arc: add sparsemem support arch/arc/Kconfig | 10 ++++++++++ arch/arc/include/asm/sparsemem.h | 13 +++++++++++++ arch/arc/mm/init.c | 7 ++++++- 3 files changed, 29 insertions(+), 1 deletion(-) create mode 100644 arch/arc/include/asm/sparsemem.h -- 2.26.2 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
