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Kernel: Serialize debug output

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Tom 2020-06-05 22:01:30 -06:00 • committed by Andreas Kling
parent 1da7fea602
commit 3ac6d31b45
5 changed files with 177 additions and 20 deletions
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26
Kernel/Heap/SlabAllocator.cpp
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@ -28,6 +28,7 @@
#include <AK/Memory.h>
#include <Kernel/Heap/SlabAllocator.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/SpinLock.h>
#include <Kernel/VM/Region.h>
#define SANITIZE_SLABS
@ -50,22 +51,22 @@ public:
}
slabs[0].next = nullptr;
m_freelist = &slabs[slab_count - 1];
m_num_allocated = 0;
m_num_free = slab_count;
m_num_allocated.store(0, AK::MemoryOrder::memory_order_release);
m_num_free.store(slab_count, AK::MemoryOrder::memory_order_release);
}
constexpr size_t slab_size() const { return templated_slab_size; }
void* alloc()
{
InterruptDisabler disabler;
ScopedSpinLock lock(m_lock);
if (!m_freelist)
return kmalloc(slab_size());
ASSERT(m_freelist);
void* ptr = m_freelist;
m_freelist = m_freelist->next;
++m_num_allocated;
--m_num_free;
m_num_allocated.fetch_add(1, AK::MemoryOrder::memory_order_acq_rel);
m_num_free.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
#ifdef SANITIZE_SLABS
memset(ptr, SLAB_ALLOC_SCRUB_BYTE, slab_size());
#endif
@ -74,7 +75,7 @@ public:
void dealloc(void* ptr)
{
InterruptDisabler disabler;
ScopedSpinLock lock(m_lock);
ASSERT(ptr);
if (ptr < m_base || ptr >= m_end) {
kfree(ptr);
@ -86,12 +87,12 @@ public:
memset(((FreeSlab*)ptr)->padding, SLAB_DEALLOC_SCRUB_BYTE, sizeof(FreeSlab::padding));
#endif
m_freelist = (FreeSlab*)ptr;
++m_num_allocated;
--m_num_free;
m_num_allocated.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
m_num_free.fetch_add(1, AK::MemoryOrder::memory_order_acq_rel);
}
size_t num_allocated() const { return m_num_allocated; }
size_t num_free() const { return m_num_free; }
size_t num_allocated() const { return m_num_allocated.load(AK::MemoryOrder::memory_order_consume); }
size_t num_free() const { return m_num_free.load(AK::MemoryOrder::memory_order_consume); }
private:
struct FreeSlab {
@ -101,10 +102,11 @@ private:
// NOTE: These are not default-initialized to prevent an init-time constructor from overwriting them
FreeSlab* m_freelist;
size_t m_num_allocated;
size_t m_num_free;
Atomic<size_t> m_num_allocated;
Atomic<size_t> m_num_free;
void* m_base;
void* m_end;
SpinLock<u32> m_lock;
static_assert(sizeof(FreeSlab) == templated_slab_size);
};