• Frederic Weisbecker's avatar
    tracing/syscalls: core infrastructure for syscalls tracing, enhancements · bed1ffca
    Frederic Weisbecker authored
    
    
    Impact: new feature
    
    This adds the generic support for syscalls tracing. This is
    currently exploited through a devoted tracer but other tracing
    engines can use it. (They just have to play with
    {start,stop}_ftrace_syscalls() and use the display callbacks
    unless they want to override them.)
    
    The syscalls prototypes definitions are abused here to steal
    some metadata informations:
    
    - syscall name, param types, param names, number of params
    
    The syscall addr is not directly saved during this definition
    because we don't know if its prototype is available in the
    namespace. But we don't really need it. The arch has just to
    build a function able to resolve the syscall number to its
    metadata struct.
    
    The current tracer prints the syscall names, parameters names
    and values (and their types optionally). Currently the value is
    a raw hex but higher level values diplaying is on my TODO list.
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    LKML-Reference: <1236955332-10133-2-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    bed1ffca
ftrace.h 14.8 KB