From: Zhen Lei <thunder.leizhen@xxxxxxxxxx> v5 --> v6: 1. Use print_hex_dump() to dump the memory of slab object. 2. Add a new dump prefix DUMP_PREFIX_ADDRESS_LOW16 3. Minimize the output width of the offset v4 --> v5: 1. Add Reviewed-by Acked-by for patch 1/3 2. Add patch 3/3: mm: Dump the memory of slab object in kmem_dump_obj() v3 --> v4: 1. Remove kmem_valid_obj() and convert kmem_dump_obj() to work the same way as vmalloc_dump_obj(). 2. In kernel/rcu/rcu.h -#include <linux/mm.h> +#include <linux/slab.h> v2 --> v3: 1. I made statistics about the source of 'rhp'. kmem_valid_obj() accounts for more than 97.5%, and vmalloc accounts for less than 1%. So change call mem_dump_obj() to call kmem_dump_obj() can meet debugging requirements and avoid the potential deadlock risk of vmalloc_dump_obj(). - mem_dump_obj(rhp); + if (kmem_valid_obj(rhp)) + kmem_dump_obj(rhp); The discussion about vmap_area_lock deadlock in v2: https://lkml.org/lkml/2022/11/11/493 2. Provide static inline empty functions for kmem_valid_obj() and kmem_dump_obj() when CONFIG_PRINTK=n. v1 --> v2: 1. Remove condition "(unsigned long)rhp->func & 0x3", it have problems on x86. 2. Paul E. McKenney helped me update the commit message, thanks. Zhen Lei (5): hexdump: add a new dump prefix DUMP_PREFIX_ADDRESS_LOW16 hexdump: minimize the output width of the offset mm: Remove kmem_valid_obj() mm: Dump the memory of slab object in kmem_dump_obj() rcu: Dump memory object info if callback function is invalid include/linux/printk.h | 1 + include/linux/slab.h | 5 ++-- kernel/rcu/rcu.h | 7 +++++ kernel/rcu/srcutiny.c | 1 + kernel/rcu/srcutree.c | 1 + kernel/rcu/tasks.h | 1 + kernel/rcu/tiny.c | 1 + kernel/rcu/tree.c | 1 + lib/hexdump.c | 17 +++++++++-- mm/slab_common.c | 68 ++++++++++++++++++++++-------------------- mm/util.c | 4 +-- 11 files changed, 67 insertions(+), 40 deletions(-) -- 2.34.1
