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ircd::prof: Add a scope_cycles utility device.

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This commit is contained in:
Jason Volk 2019-09-21 12:13:24 -07:00
parent 08ef760266
commit 71a59d20e0
2 changed files with 64 additions and 0 deletions
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1
include/ircd/prof/prof.h
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@ -35,6 +35,7 @@ namespace ircd::prof
#include "x86.h"
#include "vg.h"
#include "type.h"
#include "scope_cycles.h"
#include "syscall_timer.h"
#include "instructions.h"
#include "resource.h"

63
include/ircd/prof/scope_cycles.h Normal file
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@ -0,0 +1,63 @@
// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_PROF_SCOPE_CYCLES_H
namespace ircd::prof
{
struct scope_cycles;
}
/// Count the reference cycles for a scope using the lifetime of this object.
/// The result is stored in `result`. Note that `result` is also used while
/// this object is operating.
struct ircd::prof::scope_cycles
{
uint64_t &result;
scope_cycles(uint64_t &result) noexcept;
~scope_cycles() noexcept;
};
extern inline
__attribute__((flatten, always_inline, gnu_inline, artificial))
ircd::prof::scope_cycles::scope_cycles(uint64_t &result)
noexcept
:result{result}
{
#if defined(__x86_64__) || defined(__i386__)
asm volatile ("mfence");
asm volatile ("lfence");
#endif
result = cycles();
#if defined(__x86_64__) || defined(__i386__)
asm volatile ("lfence");
#endif
}
extern inline
__attribute__((flatten, always_inline, gnu_inline, artificial))
ircd::prof::scope_cycles::~scope_cycles()
noexcept
{
#if defined(__x86_64__) || defined(__i386__)
asm volatile ("mfence");
asm volatile ("lfence");
#endif
result = cycles() - result;
#if defined(__x86_64__) || defined(__i386__)
asm volatile ("lfence");
#endif
}