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// tapset for HW performance monitoring
// Copyright (C) 2005-2010 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");
static const string TOK_EVENT("event");
static const string TOK_SAMPLE("sample");
// ------------------------------------------------------------------------
// perf event derived probes
// ------------------------------------------------------------------------
// This is a new interface to the perfmon hw.
//
struct perf_derived_probe: public derived_probe
{
string event_name;
string event_type;
string event_config;
int64_t interval;
perf_derived_probe (probe* p, probe_point* l, const string& name,
const string& type, const string& config, int64_t i);
virtual void join_group (systemtap_session& s);
};
struct perf_derived_probe_group: public generic_dpg<perf_derived_probe>
{
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,
const string& name,
const string& type,
const string& config,
int64_t i):
derived_probe (p, new probe_point(*l) /* .components soon rewritten */),
event_name (name), event_type (type), event_config (config), interval (i)
{
vector<probe_point::component*>& comps = this->sole_location()->components;
comps.clear();
comps.push_back (new probe_point::component (TOK_PERF));
comps.push_back (new probe_point::component (TOK_EVENT, new literal_string (event_name)));
comps.push_back (new probe_point::component (TOK_SAMPLE, new literal_number (interval)));
}
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_module_decls (systemtap_session& s)
{
if (probes.empty()) return;
s.op->newline() << "/* ---- perf probes ---- */";
s.op->newline() << "#include \"perf.c\"";
s.op->newline();
/* declarations */
s.op->newline() << "static void handle_perf_probe (const char *pp, "
<< "void (*ph) (struct context*), struct pt_regs *regs);";
for (unsigned i=0; i < probes.size(); i++)
s.op->newline() << "static void enter_perf_probe_" << i
<< " (struct perf_event *e, int nmi, "
<< "struct perf_sample_data *data, "
<< "struct pt_regs *regs);";
s.op->newline();
/* data structures */
s.op->newline() << "static struct stap_perf_probe {";
s.op->newline(1) << "struct perf_event_attr attr;";
s.op->newline() << "perf_overflow_handler_t cb;";
s.op->newline() << "const char *pp;";
s.op->newline() << "void (*ph) (struct context*);";
s.op->newline() << "Perf *perf;";
s.op->newline(-1) << "} stap_perf_probes [" << probes.size() << "] = {";
s.op->indent(1);
for (unsigned i=0; i < probes.size(); i++)
{
s.op->newline() << "{";
s.op->newline(1) << ".attr={ "
<< ".type=" << probes[i]->event_type << ", "
<< ".config=" << probes[i]->event_config << ", "
<< "{ .sample_period=" << probes[i]->interval << "ULL }},";
s.op->newline() << ".cb=enter_perf_probe_" << i << ", ";
s.op->newline() << ".pp=" << lex_cast_qstring (*probes[i]->sole_location()) << ",";
s.op->newline() << ".ph=" << probes[i]->name << ",";
s.op->newline(-1) << "},";
}
s.op->newline(-1) << "};";
s.op->newline();
/* wrapper functions */
for (unsigned i=0; i < probes.size(); i++)
{
s.op->newline() << "static void enter_perf_probe_" << i
<< " (struct perf_event *e, int nmi, "
<< "struct perf_sample_data *data, "
<< "struct pt_regs *regs)";
s.op->newline() << "{";
s.op->newline(1) << "handle_perf_probe(" << lex_cast_qstring (*probes[i]->sole_location())
<< ", " << probes[i]->name << ", regs);";
s.op->newline(-1) << "}";
}
s.op->newline();
s.op->newline() << "static void handle_perf_probe (const char *pp, "
<< "void (*ph) (struct context*), struct pt_regs *regs)";
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) << "}";
}
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() << "stp->perf = _stp_perf_init(&stp->attr, stp->cb, stp->pp, stp->ph);";
s.op->newline() << "if (stp->perf == NULL) {";
s.op->newline(1) << "rc = -EINVAL;";
s.op->newline() << "for (j=0; j<i; j++) {";
s.op->newline(1) << "stp = & stap_perf_probes [j];";
s.op->newline() << "_stp_perf_del(stp->perf);";
s.op->newline() << "stp->perf = NULL;";
s.op->newline(-1) << "}"; // for unwind loop
s.op->newline(-1) << "}"; // if-error
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) << "struct stap_perf_probe* stp = & stap_perf_probes [i];";
s.op->newline() << "_stp_perf_del(stp->perf);";
s.op->newline() << "stp->perf = NULL;";
s.op->newline(-1) << "}"; // for loop
}
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);
private:
typedef map<string, pair<string, string> > event_map_t;
event_map_t events;
void translate_event(const string& name, string& type, string& config);
};
void
perf_builder::build(systemtap_session & sess,
probe * base,
probe_point * location,
literal_map_t const & parameters,
vector<derived_probe *> & finished_results)
{
string name, type, config;
bool has_name = get_param(parameters, TOK_EVENT, name);
assert(has_name);
translate_event(name, type, config);
if (type.empty() || config.empty())
throw semantic_error("invalid perf event " + lex_cast_qstring(name),
parameters.find(TOK_EVENT)->second->tok);
// TODO support wildcards, e.g. stap -l 'perf.event("*")'
int64_t period;
bool has_period = get_param(parameters, TOK_SAMPLE, period);
if (!has_period)
period = 1000000;
else if (period < 1)
throw semantic_error("invalid perf sample period " + lex_cast(period),
parameters.find(TOK_SAMPLE)->second->tok);
if (sess.verbose > 1)
clog << "perf probe event=" << lex_cast_qstring(name) << " type=" << type
<< " config=" << config << " period=" << period << endl;
finished_results.push_back
(new perf_derived_probe(base, location, name, type, config, period));
}
void
perf_builder::translate_event(const string& name, string& type, string& config)
{
if (events.empty())
{
// XXX These are hard-coded in the perf tool, and we have to do the same.
// --- (see linux-2.6/tools/perf/util/parse-events.c)
// --- It would be much nicer to somehow generate this dynamically...
#define CHW(event) event_map_t::mapped_type("PERF_TYPE_HARDWARE", "PERF_COUNT_HW_" #event)
events["cpu-cycles"] = CHW(CPU_CYCLES);
events["cycles"] = CHW(CPU_CYCLES);
events["instructions"] = CHW(INSTRUCTIONS);
events["cache-references"] = CHW(CACHE_REFERENCES);
events["cache-misses"] = CHW(CACHE_MISSES);
events["branch-instructions"] = CHW(BRANCH_INSTRUCTIONS);
events["branches"] = CHW(BRANCH_INSTRUCTIONS);
events["branch-misses"] = CHW(BRANCH_MISSES);
events["bus-cycles"] = CHW(BUS_CYCLES);
#undef CHW
#define CSW(event) event_map_t::mapped_type("PERF_TYPE_SOFTWARE", "PERF_COUNT_SW_" #event)
events["cpu-clock"] = CSW(CPU_CLOCK);
events["task-clock"] = CSW(TASK_CLOCK);
events["page-faults"] = CSW(PAGE_FAULTS);
events["faults"] = CSW(PAGE_FAULTS);
events["minor-faults"] = CSW(PAGE_FAULTS_MIN);
events["major-faults"] = CSW(PAGE_FAULTS_MAJ);
events["context-switches"] = CSW(CONTEXT_SWITCHES);
events["cs"] = CSW(CONTEXT_SWITCHES);
events["cpu-migrations"] = CSW(CPU_MIGRATIONS);
events["migrations"] = CSW(CPU_MIGRATIONS);
events["alignment-faults"] = CSW(ALIGNMENT_FAULTS);
events["emulation-faults"] = CSW(EMULATION_FAULTS);
#undef CSW
}
event_map_t::iterator it = events.find(name);
if (it != events.end())
{
type = it->second.first;
config = it->second.second;
}
}
void
register_tapset_perf(systemtap_session& s)
{
// make sure we have support before registering anything
// XXX need additional version checks too?
// --- perhaps look for export of perf_event_create_kernel_counter
if (s.kernel_config["CONFIG_PERF_EVENTS"] != "y")
return;
derived_probe_builder *builder = new perf_builder();
match_node* perf = s.pattern_root->bind(TOK_PERF);
match_node* event = perf->bind_str(TOK_EVENT);
event->bind(builder);
event->bind_num(TOK_SAMPLE)->bind(builder);
}
/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
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