Uniprocessor system should free percpu allocation info after use as SMP system. Following table is the bootmem allocation information of one x86 UML virtual machine with 256MB memory. The virtual machine is running linux-3.12.6. Page (0x8c07000) is wasted. |------------------------------------------------------------------------------ |0x8a02000 empty_zero_page size=4096, align=4096 |0x8a03000 empty_bad_page size=4096, align=4096 |0x8a04000 mem_map,contig_page_data->node_mem_map size=2097152, align=32 |0x8c04000 contig_page_data->pageblock_flags size=24, align=32 |0x8c04020 contig_page_data->wait_table size=2048, align=32 |0x8c05000 pte_t* size=4096, align=4096 |0x8c06000 saved_command_line size=91, align=32 |0x8c06060 static_command_line size=91, align=32 |0x8c060c0 pcpu_alloc_info *ai size=4096, align=32 |0x8c08000 pcpu_base_addr size=32768, align=4096 |0x8c10000 pcpu_group_offsets size=4, align=32 |0x8c10020 pcpu_group_sizes size=4, align=32 |0x8c10040 pcpu_unit_map size=4, align=32 |0x8c10060 pcpu_unit_offsets size=4, align=32 |0x8c10080 pcpu_slot size=120, align=32 |0x8c10100 pcpu_first_chunk size=44, align=32 |0x8c10140 pid_hash size=4096, align=32 |0x8c11140 dentry_hashtable size=131072, align=32 |0x8c31140 inode_hashtable size=65536, align=32 |------------------------------------------------------------------------------ Recent UML is broken because of the commit: "resource: provide new functions to walk through resources" As a result, the patch had been tested on x86 and x86_64 UML virtual machines based on linux-next-v3.16. Honggang Li (1): Free percpu allocation info for uniprocessor system mm/percpu.c | 2 ++ 1 file changed, 2 insertions(+) -- 1.8.3.1 -- 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>