Messages in this thread | | | From | Frederic Weisbecker <> | Subject | [PATCH 0/2 v2] Syscalls tracing | Date | Fri, 13 Mar 2009 15:42:10 +0100 |
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tracing/syscalls: core infrastructure to trace syscalls
This new iteration addresses a good part of the previous reviews.
As suggested by Ingo Molnar and Peter Zijlstra, the syscalls prototypes probing is done by abusing the SYSCALL_DEFINE family macros. We now store automatically the arguments names, their types, their number and the name of the syscall.
Also some fixes on output newlines and dangerous exporting of global_trace are provided.
An example of the trace:
echo syscall > /debugfs/tracing/current_tracer
# tracer: syscall # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | <...>-5080 [001] 132.192228: sys_dup2(oldfd: a, newfd: 1) <...>-5080 [001] 132.192239: sys_dup2 -> 0x1 <...>-5080 [001] 132.192242: sys_fcntl(fd: a, cmd: 1, arg: 0) <...>-5080 [001] 132.192245: sys_fcntl -> 0x1 <...>-5080 [001] 132.192248: sys_close(fd: a) <...>-5080 [001] 132.192250: sys_close -> 0x0 <...>-5080 [001] 132.192265: sys_rt_sigprocmask(how: 0, set: 0, oset: 6cf808, sigsetsize: 8) <...>-5080 [001] 132.192267: sys_rt_sigprocmask -> 0x0 <...>-5080 [001] 132.192271: sys_rt_sigaction(sig: 2, act: 7fffff4338f0, oact: 7fffff433850, sigsetsize: 8) <...>-5080 [001] 132.192273: sys_rt_sigaction -> 0x0 <...>-5080 [001] 132.192285: sys_rt_sigprocmask(how: 0, set: 0, oset: 6cf808, sigsetsize: 8) <...>-5080 [001] 132.192287: sys_rt_sigprocmask -> 0x0 <...>-5080 [001] 132.192415: sys_write(fd: 1, buf: 15dfc08, count: 21) <...>-5080 [001] 132.192436: sys_write -> 0x21 <...>-4754 [000] 132.192478: sys_read(fd: 8, buf: 2a9340e, count: 1fee) <...>-5080 [001] 132.192487: sys_rt_sigprocmask(how: 0, set: 7fffff432a70, oset: 7fffff4329f0, sigsetsize: 8)
And if you ask for the parameters types:
echo syscall_arg_type > trace_options
# tracer: syscall # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | <...>-5080 [001] 132.192228: sys_dup2(unsigned int oldfd: a, unsigned int newfd: 1) <...>-5080 [001] 132.192239: sys_dup2 -> 0x1 <...>-5080 [001] 132.192242: sys_fcntl(unsigned int fd: a, unsigned int cmd: 1, unsigned long arg: 0) <...>-5080 [001] 132.192245: sys_fcntl -> 0x1 <...>-5080 [001] 132.192248: sys_close(unsigned int fd: a) <...>-5080 [001] 132.192250: sys_close -> 0x0 <...>-5080 [001] 132.192265: sys_rt_sigprocmask(int how: 0, sigset_t * set: 0, sigset_t * oset: 6cf808, size_t sigsetsize: 8) <...>-5080 [001] 132.192267: sys_rt_sigprocmask -> 0x0 <...>-5080 [001] 132.192271: sys_rt_sigaction(int sig: 2, const struct sigaction * act: 7fffff4338f0, struct sigaction * oact: 7fffff433850, size_t sigsetsize: 8) <...>-5080 [001] 132.192273: sys_rt_sigaction -> 0x0 <...>-5080 [001] 132.192285: sys_rt_sigprocmask(int how: 0, sigset_t * set: 0, sigset_t * oset: 6cf808, size_t sigsetsize: 8) <...>-5080 [001] 132.192287: sys_rt_sigprocmask -> 0x0 <...>-5080 [001] 132.192415: sys_write(unsigned int fd: 1, const char * buf: 15dfc08, size_t count: 21) <...>-5080 [001] 132.192436: sys_write -> 0x21
TODO:
- add a single mask on the struct syscall_metadata to provide quickly which arguments is a pointer (usually type __user *p) so that the user can decide if he wants to save them of tracing time
- now that we have each parameter type as strings, add a new field on struct syscall_metadata to have the parameter types encoded as single enum values (for quick checks) so that we can use specific callbacks for each parameter type to be displayed.
NOTE: this is still not overlapping with a potential future merge of utrace, since the low-level hooks on the syscalls remain somewhat basic.
NOTE2: I've only tested it on x86-64 for now, so only x86-64 support is provided. --
Frederic Weisbecker (2): tracing/syscalls: core infrastructure for syscalls tracing tracing/syscalls: support for syscalls tracing on x86-64
arch/x86/Kconfig | 1 + arch/x86/include/asm/ftrace.h | 7 + arch/x86/include/asm/thread_info.h | 9 +- arch/x86/kernel/ftrace.c | 63 +++++++++ arch/x86/kernel/ptrace.c | 7 + include/asm-generic/vmlinux.lds.h | 11 ++- include/linux/ftrace.h | 29 +++++ include/linux/syscalls.h | 60 +++++++++- kernel/trace/Kconfig | 10 ++ kernel/trace/Makefile | 1 + kernel/trace/trace.h | 19 +++ kernel/trace/trace_syscalls.c | 243 ++++++++++++++++++++++++++++++++++++ 12 files changed, 454 insertions(+), 6 deletions(-) create mode 100644 kernel/trace/trace_syscalls.c
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