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kernel: profile system when SYSTEM_PROFILER is defined.

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* This enables a mechanism to profile almost the complete boot process
  (starting with main2()), if SYSTEM_PROFILER is defined to 1.
* You can access the profiling data using "profile -r".
This commit is contained in:
Axel Dörfler 2015-04-15 17:06:51 +02:00
parent 1480e5da6f
commit 035e3e77ed
4 changed files with 28 additions and 5 deletions
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6
build/config_headers/kernel_debug_config.h
View File

@ -133,5 +133,11 @@
// Enables tracking of page allocations.
#define VM_PAGE_ALLOCATION_TRACKING 0
// Enables the (boot) system profiler for use with "profile -r"
#define SYSTEM_PROFILER 0
#define SYSTEM_PROFILE_SIZE 40 * 1024 * 1024
#define SYSTEM_PROFILE_STACK_DEPTH 10
#define SYSTEM_PROFILE_INTERVAL 10000
#endif // KERNEL_DEBUG_CONFIG_H

4
headers/private/kernel/system_profiler.h
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@ -9,15 +9,19 @@
#include <OS.h>
#include "kernel_debug_config.h"
struct system_profiler_parameters;
__BEGIN_DECLS
#if SYSTEM_PROFILER
status_t start_system_profiler(size_t areaSize, uint32 stackDepth,
bigtime_t interval);
void stop_system_profiler();
#endif
status_t _user_system_profiler_start(
struct system_profiler_parameters* parameters);

12
src/system/kernel/debug/system_profiler.cpp
View File

@ -1435,6 +1435,8 @@ SystemProfiler::_ProfilingEvent(struct timer* timer)
// #pragma mark - private kernel API
#if SYSTEM_PROFILER
status_t
start_system_profiler(size_t areaSize, uint32 stackDepth, bigtime_t interval)
{
@ -1530,6 +1532,8 @@ stop_system_profiler()
profiler->ReleaseReference();
}
#endif // SYSTEM_PROFILER
// #pragma mark - syscalls
@ -1644,13 +1648,16 @@ _user_system_profiler_stop()
status_t
_user_system_profiler_recorded(struct system_profiler_parameters* userParameters)
_user_system_profiler_recorded(system_profiler_parameters* userParameters)
{
if (userParameters == NULL || !IS_USER_ADDRESS(userParameters))
return B_BAD_ADDRESS;
if (sRecordedParameters == NULL)
return B_ERROR;
#if SYSTEM_PROFILER
stop_system_profiler();
// Transfer the area to the userland process
void* address;
@ -1673,4 +1680,7 @@ _user_system_profiler_recorded(struct system_profiler_parameters* userParameters
sRecordedParameters = NULL;
return status;
#else
return B_NOT_SUPPORTED;
#endif // SYSTEM_PROFILER
}

11
src/system/kernel/main.cpp
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@ -1,5 +1,5 @@
/*
* Copyright 2002-2010, Axel Dörfler, axeld@pinc-software.de.
* Copyright 2002-2015, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
@ -47,6 +47,7 @@
#include <real_time_clock.h>
#include <sem.h>
#include <smp.h>
#include <system_profiler.h>
#include <team.h>
#include <timer.h>
#include <user_debugger.h>
@ -273,12 +274,14 @@ _start(kernel_args *bootKernelArgs, int currentCPU)
static int32
main2(void *unused)
main2(void* /*unused*/)
{
(void)(unused);
TRACE("start of main2: initializing devices\n");
#if SYSTEM_PROFILER
start_system_profiler(SYSTEM_PROFILE_SIZE, SYSTEM_PROFILE_STACK_DEPTH,
SYSTEM_PROFILE_INTERVAL);
#endif
boot_splash_init(sKernelArgs.boot_splash);
commpage_init_post_cpus();