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Kernel: Use KBuffers for ProcFS and SynthFS

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Instead of generating ByteBuffers and keeping those lying around, have
these filesystems generate KBuffers instead. These are way less spooky
to leave around for a while.

Since FileDescription will keep a generated file buffer around until
userspace has read the whole thing, this prevents trivially exhausting
the kmalloc heap by opening many files in /proc for example.

The code responsible for generating each /proc file is not perfectly
efficient and many of them still use ByteBuffers internally but they
at least go away when we return now. :^)
This commit is contained in:
Andreas Kling 2019-08-05 11:35:49 +02:00
parent 6b6b86fbf3
commit 79e22acb22
7 changed files with 58 additions and 43 deletions
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7
Kernel/VM/MemoryManager.h
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@ -6,8 +6,8 @@
#include <AK/ByteBuffer.h>
#include <AK/HashTable.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/RefPtr.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <AK/Weakable.h>
@ -20,6 +20,7 @@
#define PAGE_ROUND_UP(x) ((((u32)(x)) + PAGE_SIZE - 1) & (~(PAGE_SIZE - 1)))
class KBuffer;
class SynthFSInode;
enum class PageFaultResponse {
@ -36,8 +37,8 @@ class MemoryManager {
friend class PhysicalRegion;
friend class Region;
friend class VMObject;
friend ByteBuffer procfs$mm(InodeIdentifier);
friend ByteBuffer procfs$memstat(InodeIdentifier);
friend Optional<KBuffer> procfs$mm(InodeIdentifier);
friend Optional<KBuffer> procfs$memstat(InodeIdentifier);
public:
static MemoryManager& the();