Commit 54a69e55 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Greg Kroah-Hartman
Browse files

lttng: syscall instrumentation 



x86-32 and x86-64 system call instrumentation, along with the
lttng-syscalls-generate-headers.sh script that generates the headers
from the system call list. See README for details.

Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 763be8c0

drivers/staging/lttng/instrumentation/syscalls/3.0.4/x86-64-syscalls-3.0.4

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drivers/staging/lttng/instrumentation/syscalls/3.1.0-rc6/x86-32-syscalls-3.1.0-rc6

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drivers/staging/lttng/instrumentation/syscalls/README

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LTTng system call tracing



1) lttng-syscall-extractor



You need to build a kernel with CONFIG_FTRACE_SYSCALLS=y and

CONFIG_KALLSYMS_ALL=y for extraction. Apply the linker patch to get your

kernel to keep the system call metadata after boot.  Then build and load

the LTTng syscall extractor module. The module will fail to load (this

is expected). See the dmesg output for system call metadata.



2) Generate system call TRACE_EVENT().



Take the dmesg metadata and feed it to lttng-syscalls-generate-headers.sh, e.g.,

from the instrumentation/syscalls directory. See the script header for

usage example.



After these are created, we just need to follow the new system call additions,

no need to regenerate the whole thing, since system calls are only appended to.

drivers/staging/lttng/instrumentation/syscalls/headers/compat_syscalls_integers.h

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#ifdef CONFIG_X86_64

#include "x86-32-syscalls-3.1.0-rc6_integers.h"

#endif

drivers/staging/lttng/instrumentation/syscalls/headers/compat_syscalls_pointers.h

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#ifdef CONFIG_X86_64

#include "x86-32-syscalls-3.1.0-rc6_pointers.h"

#endif

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