From e548eaa116d858f07816d41e24835a41f7e7d270 Mon Sep 17 00:00:00 2001 From: Maninder Singh Date: Tue, 16 Mar 2021 16:07:11 +0530 Subject: mm/slub: Add Support for free path information of an object This commit adds enables a stack dump for the last free of an object: slab kmalloc-64 start c8ab0140 data offset 64 pointer offset 0 size 64 allocated at meminfo_proc_show+0x40/0x4fc [ 20.192078] meminfo_proc_show+0x40/0x4fc [ 20.192263] seq_read_iter+0x18c/0x4c4 [ 20.192430] proc_reg_read_iter+0x84/0xac [ 20.192617] generic_file_splice_read+0xe8/0x17c [ 20.192816] splice_direct_to_actor+0xb8/0x290 [ 20.193008] do_splice_direct+0xa0/0xe0 [ 20.193185] do_sendfile+0x2d0/0x438 [ 20.193345] sys_sendfile64+0x12c/0x140 [ 20.193523] ret_fast_syscall+0x0/0x58 [ 20.193695] 0xbeeacde4 [ 20.193822] Free path: [ 20.193935] meminfo_proc_show+0x5c/0x4fc [ 20.194115] seq_read_iter+0x18c/0x4c4 [ 20.194285] proc_reg_read_iter+0x84/0xac [ 20.194475] generic_file_splice_read+0xe8/0x17c [ 20.194685] splice_direct_to_actor+0xb8/0x290 [ 20.194870] do_splice_direct+0xa0/0xe0 [ 20.195014] do_sendfile+0x2d0/0x438 [ 20.195174] sys_sendfile64+0x12c/0x140 [ 20.195336] ret_fast_syscall+0x0/0x58 [ 20.195491] 0xbeeacde4 Acked-by: Vlastimil Babka Co-developed-by: Vaneet Narang Signed-off-by: Vaneet Narang Signed-off-by: Maninder Singh Signed-off-by: Paul E. McKenney --- mm/slab_common.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'mm/slab_common.c') diff --git a/mm/slab_common.c b/mm/slab_common.c index f8833d3e5d47..92e3aa78bb4d 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -564,7 +564,7 @@ EXPORT_SYMBOL_GPL(kmem_valid_obj); * depends on the type of object and on how much debugging is enabled. * For a slab-cache object, the fact that it is a slab object is printed, * and, if available, the slab name, return address, and stack trace from - * the allocation of that object. + * the allocation and last free path of that object. * * This function will splat if passed a pointer to a non-slab object. * If you are not sure what type of object you have, you should instead @@ -609,6 +609,16 @@ void kmem_dump_obj(void *object) break; pr_info(" %pS\n", kp.kp_stack[i]); } + + if (kp.kp_free_stack[0]) + pr_cont(" Free path:\n"); + + for (i = 0; i < ARRAY_SIZE(kp.kp_free_stack); i++) { + if (!kp.kp_free_stack[i]) + break; + pr_info(" %pS\n", kp.kp_free_stack[i]); + } + } EXPORT_SYMBOL_GPL(kmem_dump_obj); #endif -- cgit