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2e33af0295
Move the defined fields from the event to the class structure.
Since the fields of the event are defined by the class they belong
to, it makes sense to have the class hold the information instead
of the individual events. The events of the same class would just
hold duplicate information.
After this change the size of the kernel dropped another 3K:
text data bss dec hex filename
4913961 1088356 861512 6863829 68bbd5 vmlinux.orig
4900252 1057412 861512 6819176 680d68 vmlinux.regs
4900375 1053380 861512 6815267 67fe23 vmlinux.fields
Although the text increased, this was mainly due to the C files
having to adapt to the change. This is a constant increase, where
new tracepoints will not increase the Text. But the big drop is
in the data size (as well as needed allocations to hold the fields).
This will give even more savings as more tracepoints are created.
Note, if just TRACE_EVENT()s are used and not DECLARE_EVENT_CLASS()
with several DEFINE_EVENT()s, then the savings will be lost. But
we are pushing developers to consolidate events with DEFINE_EVENT()
so this should not be an issue.
The kprobes define a unique class to every new event, but are dynamic
so it should not be a issue.
The syscalls however have a single class but the fields for the individual
events are different. The syscalls use a metadata to define the
fields. I moved the fields list from the event to the metadata and
added a "get_fields()" function to the class. This function is used
to find the fields. For normal events and kprobes, get_fields() just
returns a pointer to the fields list_head in the class. For syscall
events, it returns the fields list_head in the metadata for the event.
v2: Fixed the syscall fields. The syscall metadata needs a list
of fields for both enter and exit.
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
#ifndef _TRACE_SYSCALL_H
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#define _TRACE_SYSCALL_H
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#include <linux/tracepoint.h>
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#include <linux/unistd.h>
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#include <linux/ftrace_event.h>
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#include <asm/ptrace.h>
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/*
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* A syscall entry in the ftrace syscalls array.
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*
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* @name: name of the syscall
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* @syscall_nr: number of the syscall
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* @nb_args: number of parameters it takes
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* @types: list of types as strings
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* @args: list of args as strings (args[i] matches types[i])
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* @enter_event: associated syscall_enter trace event
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* @exit_event: associated syscall_exit trace event
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*/
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struct syscall_metadata {
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const char *name;
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int syscall_nr;
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int nb_args;
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const char **types;
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const char **args;
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struct list_head enter_fields;
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struct list_head exit_fields;
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struct ftrace_event_call *enter_event;
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struct ftrace_event_call *exit_event;
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};
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#ifdef CONFIG_FTRACE_SYSCALLS
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extern unsigned long arch_syscall_addr(int nr);
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extern int init_syscall_trace(struct ftrace_event_call *call);
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extern int reg_event_syscall_enter(struct ftrace_event_call *call);
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extern void unreg_event_syscall_enter(struct ftrace_event_call *call);
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extern int reg_event_syscall_exit(struct ftrace_event_call *call);
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extern void unreg_event_syscall_exit(struct ftrace_event_call *call);
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extern int
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ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
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enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
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enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
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#endif
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#ifdef CONFIG_PERF_EVENTS
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int perf_sysenter_enable(struct ftrace_event_call *call);
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void perf_sysenter_disable(struct ftrace_event_call *call);
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int perf_sysexit_enable(struct ftrace_event_call *call);
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void perf_sysexit_disable(struct ftrace_event_call *call);
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#endif
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#endif /* _TRACE_SYSCALL_H */
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