This adds the utrace facility, a new modular interface in the kernel for implementing user thread tracing and debugging. This fits on top of the tracehook_* layer, so the new code is well-isolated.
The new interface is in <linux/utrace.h> and the DocBook utrace book describes it. It allows for multiple separate tracing engines to work in parallel without interfering with each other. Higher-level tracing facilities can be implemented as loadable kernel modules using this layer. The new facility is made optional under CONFIG_UTRACE. When this is not enabled, no new code is added. It can only be enabled on machines that have all the prerequisites and select CONFIG_HAVE_ARCH_TRACEHOOK. In this initial version, utrace and ptrace do not play together at all. The next patch reworks ptrace to use the utrace API. Signed-off-by: Roland McGrath <rol...@redhat.com> Signed-off-by: Oleg Nesterov <o...@redhat.com> Integrated-by: Tom Zanussi <tom.zanu...@intel.com> --- Documentation/DocBook/Makefile | 2 +- Documentation/DocBook/utrace.tmpl | 589 +++++++++ fs/proc/array.c | 3 + include/linux/sched.h | 5 + include/linux/tracehook.h | 87 ++- include/linux/utrace.h | 692 +++++++++++ init/Kconfig | 9 + kernel/Makefile | 1 + kernel/fork.c | 3 + kernel/utrace.c | 2440 +++++++++++++++++++++++++++++++++++++ 10 files changed, 3829 insertions(+), 2 deletions(-) create mode 100644 Documentation/DocBook/utrace.tmpl create mode 100644 include/linux/utrace.h create mode 100644 kernel/utrace.c Patch too large to post here, see git repo. _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
