1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// tapset for HW performance monitoring
// Copyright (C) 2005-2009 Red Hat Inc.
// Copyright (C) 2005-2007 Intel Corporation.
// Copyright (C) 2008 James.Bottomley@HansenPartnership.com
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#include "session.h"
#include "tapsets.h"
#include "translate.h"
#include "util.h"
#include <string>
using namespace std;
using namespace __gnu_cxx;
static const string TOK_PERF("perf");
// ------------------------------------------------------------------------
// perf event derived probes
// ------------------------------------------------------------------------
// This is a new interface to the perfmon hw.
//
struct perf_derived_probe: public derived_probe
{
int64_t interval;
perf_derived_probe (probe* p, probe_point* l, int64_t i);
virtual void join_group (systemtap_session& s);
};
struct perf_derived_probe_group: public generic_dpg<perf_derived_probe>
{
void emit_interval (translator_output* o);
public:
void emit_module_decls (systemtap_session& s);
void emit_module_init (systemtap_session& s);
void emit_module_exit (systemtap_session& s);
};
perf_derived_probe::perf_derived_probe (probe* p, probe_point* l,
int64_t i):
derived_probe (p, l), interval (i)
{
}
void
perf_derived_probe::join_group (systemtap_session& s)
{
if (! s.perf_derived_probes)
s.perf_derived_probes = new perf_derived_probe_group ();
s.perf_derived_probes->enroll (this);
}
void
perf_derived_probe_group::emit_interval (translator_output* o)
{
}
void
perf_derived_probe_group::emit_module_decls (systemtap_session& s)
{
if (probes.empty()) return;
s.op->newline() << "/* ---- perf probes ---- */";
s.op->newline() << "#include \"perf.c\"";
/* declarations */
for (unsigned i=0; i < probes.size(); i++)
{
}
s.op->newline();
/* wrapper functions */
for (unsigned i=0; i < probes.size(); i++) {
s.op->newline() << "void enter_perf_probe_" << i <<" (struct perf_event *e, int nmi,";
s.op->newline(1) << "struct perf_sample_data *data,";
s.op->newline() << "struct pt_regs *regs)";
s.op->newline(-1) << "{";
s.op->newline(1) << "/* handle_perf_probe(pp, &probe_NNN, regs); */";
s.op->newline(-1) << "}";
}
s.op->newline() << "static void handle_perf_probe (const char *pp,";
s.op->newline(1) << "void (*ph) (struct context*),";
s.op->newline() << "struct pt_regs *regs)";
s.op->newline(-1) << "{";
s.op->newline(1) << "if ((atomic_read (&session_state) == STAP_SESSION_STARTING) ||";
s.op->newline(1) << " (atomic_read (&session_state) == STAP_SESSION_RUNNING)) {";
s.op->newline(-1) << "}";
s.op->newline() << "{";
s.op->indent(1);
common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING", "pp");
s.op->newline() << "c->regs = regs;";
s.op->newline() << "(*ph) (c);";
common_probe_entryfn_epilogue (s.op);
s.op->newline(-1) << "}";
s.op->newline(-1) << "}";
}
void
perf_derived_probe_group::emit_module_init (systemtap_session& s)
{
if (probes.empty()) return;
s.op->newline() << "for (i=0; i<" << probes.size() << "; i++) {";
s.op->newline(1) << "/* struct stap_perf_probe* stp = & stap_perf_probes [i]; */";
s.op->newline(-1) << "}"; // for loop
}
void
perf_derived_probe_group::emit_module_exit (systemtap_session& s)
{
if (probes.empty()) return;
s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)";
s.op->newline(1) << "/* FIXME */;";
s.op->indent(-1);
}
struct perf_builder: public derived_probe_builder
{
virtual void build(systemtap_session & sess,
probe * base, probe_point * location,
literal_map_t const & parameters,
vector<derived_probe *> & finished_results);
static void register_patterns(systemtap_session& s);
};
void
perf_builder::build(systemtap_session & sess,
probe * base,
probe_point * location,
literal_map_t const & parameters,
vector<derived_probe *> & finished_results)
{
int64_t period;
/* FIXME */
if (get_param(parameters, "cycles", period))
{
}
else
throw semantic_error ("unrecognized perf variant");
finished_results.push_back
(new perf_derived_probe(base, location, period));
}
void
register_tapset_perf(systemtap_session& s)
{
// make sure we have support before registering anything
// XXX need additional version checks too?
if (s.kernel_config["CONFIG_PERF_EVENTS"] != "y")
return;
match_node* root = s.pattern_root;
derived_probe_builder *builder = new perf_builder();
root = root->bind(TOK_PERF);
root->bind_num("cycles")
->bind(builder);
}
/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
|
