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systemtap
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profiling
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pf4.txt
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pf4.stp - Profile Kernel/User Backtraces The pf4.stp script sets up time-based sampling. Every five seconds it prints out a sorted list with the top twenty kernel and/or user stack backtraces (on a per-cpu basis). Use any of --ldd, --all-modules, -d MODULE, -d /PATH/TO/EXEC to add more symbolic info. $ stap pf4.stp -T 5 --all-modules --ldd --- 1 samples recorded: 1 hits on cpu 0 groups_search+0x6 [kernel] in_group_p+0x31 [kernel] generic_permission+0x166 [kernel] __inode_permission+0x29 [kernel] inode_permission+0x18 [kernel] would_dump+0x1b [kernel] load_elf_binary+0x7c5 [kernel] search_binary_handler+0x93 [kernel] do_execve_common.isra.24+0x4ea [kernel] sys_execve+0x29 [kernel] stub_execve+0x69 [kernel] --- 0 samples recorded: