• Frederic Weisbecker's avatar
    tracing: Add fields format definition for syscall events · dc4ddb4c
    Frederic Weisbecker authored
    Define the format of the syscall trace fields to parse the binary
    values from a raw trace using the syscall events "format" file.
    
    This is defined dynamically using the syscalls metadata.
    It prepares the export of syscall event raw records to perf
    counters.
    
    Example:
    
    $ cat /debug/tracing/events/syscalls/sys_enter_sched_getparam/format
    name: sys_enter_sched_getparam
    ID: 39
    format:
    	field:unsigned short common_type;	offset:0;	size:2;
    	field:unsigned char common_flags;	offset:2;	size:1;
    	field:unsigned char common_preempt_count;	offset:3;	size:1;
    	field:int common_pid;	offset:4;	size:4;
    	field:int common_tgid;	offset:8;	size:4;
    
    	field:pid_t pid;	offset:12;	size:8;
    	field:struct sched_param * param;	offset:20;	size:8;
    
    print fmt: "pid: 0x%08lx, param: 0x%08lx", ((unsigned long)(REC->pid)), ((unsigned long)(REC->param))
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    Cc: Jiaying Zhang <jiayingz@google.com>
    Cc: Martin Bligh <mbligh@google.com>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    Cc: Masami Hiramatsu <mhiramat@redhat.com>
    Cc: Jason Baron <jbaron@redhat.com>
    dc4ddb4c
syscall.h 1.93 KB