RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-06-19 11:12:11 +00:00
Code Issues Activity Actions

Kernel: Allocate profiling memory upfront

Browse source 
We need to allocate all pages for the profiler right away so that
we don't trigger page faults in the timer interrupt handler to
allocate them.

Fixes #4734
This commit is contained in:
Tom 2021-01-01 20:15:06 -07:00 • committed by Andreas Kling
parent 06da50afc7
commit 60f5f48dd1
2 changed files with 14 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Kernel/Profiling.cpp
View file

@ -25,6 +25,7 @@
*/
#include <AK/Demangle.h>
#include <AK/Singleton.h>
#include <AK/StringBuilder.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/KBuffer.h>
@ -36,8 +37,13 @@ namespace Kernel {
namespace Profiling {
static KBufferImpl* s_profiling_buffer;
static size_t s_slot_count;
static AK::Singleton<KBuffer, []() -> KBuffer* {
auto buffer = KBuffer::try_create_with_size(8 * MiB, Region::Access::Read | Region::Access::Write, "Profiling Buffer", AllocationStrategy::AllocateNow);
s_slot_count = buffer->size() / sizeof(Sample);
return buffer.leak_ptr();
}>
s_profiling_buffer;
static size_t s_next_slot_index;
static ProcessID s_pid { -1 };
@ -62,10 +68,7 @@ void start(Process& process)
executable_path() = {};
s_pid = process.pid();
if (!s_profiling_buffer) {
s_profiling_buffer = RefPtr<KBufferImpl>(KBuffer::create_with_size(8 * MiB).impl()).leak_ref();
s_slot_count = s_profiling_buffer->size() / sizeof(Sample);
}
s_profiling_buffer.ensure_instance();
s_next_slot_index = 0;
}