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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/JsonArraySerializer.h>
#include <AK/JsonObject.h>
#include <AK/JsonObjectSerializer.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/PerformanceEventBuffer.h>
namespace Kernel {
PerformanceEventBuffer::PerformanceEventBuffer()
: m_buffer(KBuffer::create_with_size(4 * MB))
{
}
KResult PerformanceEventBuffer::append(int type, FlatPtr arg1, FlatPtr arg2)
{
if (count() >= capacity())
return KResult(-ENOBUFS);
PerformanceEvent event;
event.type = type;
switch (type) {
case PERF_EVENT_MALLOC:
event.data.malloc.size = arg1;
event.data.malloc.ptr = arg2;
#ifdef VERY_DEBUG
dbg() << "PERF_EVENT_MALLOC: " << (void*)event.data.malloc.ptr << " (" << event.data.malloc.size << ")";
#endif
break;
case PERF_EVENT_FREE:
event.data.free.ptr = arg1;
#ifdef VERY_DEBUG
dbg() << "PERF_EVENT_FREE: " << (void*)event.data.free.ptr;
#endif
break;
default:
return KResult(-EINVAL);
}
FlatPtr ebp;
asm volatile("movl %%ebp, %%eax"
: "=a"(ebp));
FlatPtr eip;
copy_from_user(&eip, (FlatPtr*)&Thread::current->get_register_dump_from_stack().eip);
Vector<FlatPtr> backtrace;
{
SmapDisabler disabler;
backtrace = Thread::current->raw_backtrace(ebp, eip);
}
event.stack_size = min(sizeof(event.stack) / sizeof(FlatPtr), static_cast<size_t>(backtrace.size()));
memcpy(event.stack, backtrace.data(), event.stack_size * sizeof(FlatPtr));
#ifdef VERY_DEBUG
for (size_t i = 0; i < event.stack_size; ++i)
dbg() << " " << (void*)event.stack[i];
#endif
event.timestamp = g_uptime;
at(m_count++) = event;
return KSuccess;
}
PerformanceEvent& PerformanceEventBuffer::at(size_t index)
{
ASSERT(index < capacity());
auto* events = reinterpret_cast<PerformanceEvent*>(m_buffer.data());
return events[index];
}
KBuffer PerformanceEventBuffer::to_json(pid_t pid, const String& executable_path) const
{
KBufferBuilder builder;
JsonObjectSerializer object(builder);
object.add("pid", pid);
object.add("executable", executable_path);
auto array = object.add_array("events");
for (size_t i = 0; i < m_count; ++i) {
auto& event = at(i);
auto event_object = array.add_object();
switch (event.type) {
case PERF_EVENT_MALLOC:
event_object.add("type", "malloc");
event_object.add("ptr", static_cast<u64>(event.data.malloc.ptr));
event_object.add("size", static_cast<u64>(event.data.malloc.size));
break;
case PERF_EVENT_FREE:
event_object.add("type", "free");
event_object.add("ptr", static_cast<u64>(event.data.free.ptr));
break;
}
event_object.add("timestamp", event.timestamp);
auto stack_array = event_object.add_array("stack");
for (size_t j = 0; j < event.stack_size; ++j) {
stack_array.add(event.stack[j]);
}
stack_array.finish();
event_object.finish();
}
array.finish();
object.finish();
return builder.build();
}
}
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