From 55fc2c6f76a0884e41d732eb94014c090b20949b Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 19 Apr 2019 05:47:30 -0700
Subject: [PATCH] ircd::prof: Add callgrind hypercall suite.

---
 configure.ac        |  1 +
 include/ircd/prof.h | 25 ++++++++++++++++++++++++
 ircd/prof.cc        | 47 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/configure.ac b/configure.ac
index ff98e9034..3fda8109c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -783,6 +783,7 @@ dnl instrumentation
 RB_CHK_SYSHEADER(malloc.h, [MALLOC_H])
 RB_CHK_SYSHEADER(valgrind/valgrind.h, [VALGRIND_VALGRIND_H])
 RB_CHK_SYSHEADER(valgrind/memcheck.h, [VALGRIND_MEMCHECK_H])
+RB_CHK_SYSHEADER(valgrind/callgrind.h, [VALGRIND_CALLGRIND_H])
 
 dnl experimental
 RB_CHK_SYSHEADER(experimental/string_view, [EXPERIMENTAL_STRING_VIEW])
diff --git a/include/ircd/prof.h b/include/ircd/prof.h
index acc1f4353..02a5b1d06 100644
--- a/include/ircd/prof.h
+++ b/include/ircd/prof.h
@@ -60,11 +60,36 @@ namespace ircd::prof::x86
 	unsigned long long rdtsc();
 }
 
+/// Callgrind hypercall suite
+namespace ircd::prof::vg
+{
+	struct enable;
+	struct disable;
+
+	void dump(const char *const reason = nullptr);
+	void toggle();
+	void reset();
+	void start() noexcept;
+	void stop() noexcept;
+}
+
 namespace ircd
 {
 	using prof::cycles;
 }
 
+struct ircd::prof::vg::enable
+{
+	enable() noexcept    { start(); }
+	~enable() noexcept   { stop();  }
+};
+
+struct ircd::prof::vg::disable
+{
+	disable() noexcept   { stop();  }
+	~disable() noexcept  { start(); }
+};
+
 struct ircd::prof::times
 {
 	uint64_t real {0};
diff --git a/ircd/prof.cc b/ircd/prof.cc
index 4a9c2dc23..1f4747a3f 100644
--- a/ircd/prof.cc
+++ b/ircd/prof.cc
@@ -13,6 +13,7 @@
 #include <RB_INC_SYS_MMAN_H
 #include <RB_INC_SYS_RESOURCE_H
 #include <linux/perf_event.h>
+#include <RB_INC_VALGRIND_CALLGRIND_H
 #include <boost/chrono/chrono.hpp>
 #include <boost/chrono/process_cpu_clocks.hpp>
 
@@ -772,6 +773,52 @@ ircd::prof::time_user()
 	return boost::chrono::process_user_cpu_clock::now().time_since_epoch().count();
 }
 
+//
+// prof::vg
+//
+
+void
+ircd::prof::vg::stop()
+noexcept
+{
+	#ifdef HAVE_VALGRIND_CALLGRIND_H
+	CALLGRIND_STOP_INSTRUMENTATION;
+	#endif
+}
+
+void
+ircd::prof::vg::start()
+noexcept
+{
+	#ifdef HAVE_VALGRIND_CALLGRIND_H
+	CALLGRIND_START_INSTRUMENTATION;
+	#endif
+}
+
+void
+ircd::prof::vg::reset()
+{
+	#ifdef HAVE_VALGRIND_CALLGRIND_H
+	CALLGRIND_ZERO_STATS;
+	#endif
+}
+
+void
+ircd::prof::vg::toggle()
+{
+	#ifdef HAVE_VALGRIND_CALLGRIND_H
+	CALLGRIND_TOGGLE_COLLECT;
+	#endif
+}
+
+void
+ircd::prof::vg::dump(const char *const reason)
+{
+	#ifdef HAVE_VALGRIND_CALLGRIND_H
+	CALLGRIND_DUMP_STATS_AT(reason);
+	#endif
+}
+
 //
 // times
 //