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init_preds() allocates about 5392 bytes of memory (on x86_32) for a TRACE_EVENT. With my config, at system boot total memory occupied is: 5392 * (642 + 15) == 3459KB 642 == cat available_events | wc -l 15 == number of dirs in events/ftrace That's quite a lot, so we'd better defer memory allocation util it's needed, that's when filter is used. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4A9B8EA5.6020700@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
206 lines
5.5 KiB
C
206 lines
5.5 KiB
C
/*
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* trace_export.c - export basic ftrace utilities to user space
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*
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* Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
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*/
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#include <linux/stringify.h>
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#include <linux/kallsyms.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/ftrace.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include "trace_output.h"
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#undef TRACE_STRUCT
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#define TRACE_STRUCT(args...) args
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extern void __bad_type_size(void);
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign) \
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if (sizeof(type) != sizeof(field.item)) \
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__bad_type_size(); \
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ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
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ret = trace_seq_printf(s, "\tfield special:" #type_item ";\t" \
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"offset:%u;\tsize:%u;\n", \
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(unsigned int)offsetof(typeof(field), item), \
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(unsigned int)sizeof(field.item)); \
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if (!ret) \
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return 0;
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#undef TRACE_FIELD_ZERO_CHAR
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#define TRACE_FIELD_ZERO_CHAR(item) \
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ret = trace_seq_printf(s, "\tfield:char " #item ";\t" \
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"offset:%u;\tsize:0;\n", \
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(unsigned int)offsetof(typeof(field), item)); \
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if (!ret) \
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return 0;
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#undef TRACE_FIELD_SIGN
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#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
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TRACE_FIELD(type, item, assign)
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#undef TP_RAW_FMT
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#define TP_RAW_FMT(args...) args
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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static int \
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ftrace_format_##call(struct ftrace_event_call *unused, \
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struct trace_seq *s) \
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{ \
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struct args field; \
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int ret; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
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\
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return ret; \
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}
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt) \
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static int \
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ftrace_format_##call(struct ftrace_event_call *unused, \
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struct trace_seq *s) \
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{ \
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struct args field; \
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int ret; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
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\
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return ret; \
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}
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#include "trace_event_types.h"
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#undef TRACE_ZERO_CHAR
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#define TRACE_ZERO_CHAR(arg)
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TRACE_FIELD_SIGN
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#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
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TRACE_FIELD(type, item, assign)
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#undef TP_CMD
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#define TP_CMD(cmd...) cmd
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#undef TRACE_ENTRY
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#define TRACE_ENTRY entry
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, len, cmd) \
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cmd;
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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int ftrace_define_fields_##call(struct ftrace_event_call *event_call); \
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static int ftrace_raw_init_event_##call(void); \
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\
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struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.id = proto, \
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.system = __stringify(TRACE_SYSTEM), \
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.raw_init = ftrace_raw_init_event_##call, \
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.show_format = ftrace_format_##call, \
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.define_fields = ftrace_define_fields_##call, \
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}; \
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static int ftrace_raw_init_event_##call(void) \
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{ \
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INIT_LIST_HEAD(&event_##call.fields); \
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return 0; \
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} \
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt) \
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\
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struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.id = proto, \
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.system = __stringify(TRACE_SYSTEM), \
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.show_format = ftrace_format_##call, \
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};
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#include "trace_event_types.h"
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), \
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is_signed_type(type), FILTER_OTHER); \
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if (ret) \
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return ret;
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type, item, len, cmd) \
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ret = trace_define_field(event_call, #type "[" #len "]", #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), 0, FILTER_OTHER); \
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if (ret) \
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return ret;
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#undef TRACE_FIELD_SIGN
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#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
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ret = trace_define_field(event_call, #type, #item, \
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offsetof(typeof(field), item), \
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sizeof(field.item), is_signed, \
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FILTER_OTHER); \
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if (ret) \
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return ret;
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#undef TRACE_FIELD_ZERO_CHAR
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#define TRACE_FIELD_ZERO_CHAR(item)
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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int \
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ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
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{ \
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struct args field; \
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int ret; \
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\
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ret = trace_define_common_fields(event_call); \
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if (ret) \
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return ret; \
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\
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tstruct; \
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\
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return ret; \
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}
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#undef TRACE_EVENT_FORMAT_NOFILTER
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#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
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tpfmt)
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#include "trace_event_types.h"
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