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mm: sort kmemleak object via backtrace
Kmemleak objects are reported each which could produce lot of redundant backtrace informations. introduce a set of method to establish a hash tree to sort the objects according to backtrace. results: [ 579.075111]c6 [ T5491] kmemleak: unreferenced object 0xffffff80badd9e00 (size 128): [ 579.082734]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892470 [ 579.096837]c6 [ T5491] kmemleak: unreferenced object 0xffffff80badd9d00 (size 128): [ 579.104435]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892470 [ 579.118563]c6 [ T5491] kmemleak: unreferenced object 0xffffff80baddce80 (size 128): [ 579.126201]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892470 [ 579.140303]c6 [ T5491] kmemleak: unreferenced object 0xffffff80baddcb00 (size 128): [ 579.147906]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892470 [ 579.162032]c6 [ T5491] kmemleak: unreferenced object 0xffffff80bae74a80 (size 128): [ 579.169661]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892470 [ 579.183775]c6 [ T5491] kmemleak: unreferenced object 0xffffff80bae74100 (size 128): [ 579.191374]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892471 [ 579.205486]c6 [ T5491] kmemleak: unreferenced object 0xffffff80bae75880 (size 128): [ 579.213127]c6 [ T5491] kmemleak: comm "swapper/0", pid 1, jiffies 4294892471 [ 579.227743]c6 [ T5491] kmemleak: backtrace: [ 579.232109]c6 [ T5491] kmemleak: [<0000000066492d96>] __kmalloc_track_caller+0x1d4/0x3e0 [ 579.240506]c6 [ T5491] kmemleak: [<00000000e5400df8>] kstrdup_const+0x6c/0xa4 [ 579.247930]c6 [ T5491] kmemleak: [<00000000d7843951>] __kernfs_new_node+0x5c/0x1dc [ 579.255830]c6 [ T5491] kmemleak: [<0000000073b5a7bd>] kernfs_new_node+0x60/0xc4 [ 579.263436]c6 [ T5491] kmemleak: [<000000002c7a48d5>] __kernfs_create_file+0x60/0xfc [ 579.271485]c6 [ T5491] kmemleak: [<00000000260ae4a1>] cgroup_addrm_files+0x244/0x4b0 [ 579.279534]c6 [ T5491] kmemleak: [<00000000ec6bce51>] css_populate_dir+0xb4/0x13c [ 579.287324]c6 [ T5491] kmemleak: [<000000005913d698>] cgroup_mkdir+0x1e0/0x31c [ 579.294859]c6 [ T5491] kmemleak: [<0000000052605ead>] kernfs_iop_mkdir.llvm.8836999160598622324+0xb0/0x168 [ 579.304817]c6 [ T5491] kmemleak: [<0000000009665bc4>] vfs_mkdir+0xec/0x170 [ 579.311990]c6 [ T5491] kmemleak: [<000000003c9c94c1>] do_mkdirat+0xa4/0x168 [ 579.319279]c6 [ T5491] kmemleak: [<000000005dd5be19>] __arm64_sys_mkdirat+0x28/0x38 [ 579.327242]c6 [ T5491] kmemleak: [<000000005a0b9381>] el0_svc_common+0xb4/0x188 [ 579.334868]c6 [ T5491] kmemleak: [<0000000063586a51>] el0_svc_handler+0x2c/0x3c [ 579.342472]c6 [ T5491] kmemleak: [<00000000edfd67aa>] el0_svc+0x8/0x100 Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
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