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Kernel: Avoid allocations when receiving network packets

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This avoids two allocations when receiving network packets. One for
inserting a PacketWithTimestamp into m_packet_queue and another one
when inserting buffers into the list of unused packet buffers.

With this fixed the only allocations in NetworkTask happen when
initially allocating the PacketWithTimestamp structs and when switching
contexts.
This commit is contained in:
Gunnar Beutner 2021-05-14 09:52:49 +02:00 • committed by Andreas Kling
parent b66f91e7d3
commit 093818de62
2 changed files with 37 additions and 23 deletions
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20
Kernel/Net/NetworkAdapter.h
View file

@ -8,8 +8,8 @@
#include <AK/ByteBuffer.h>
#include <AK/Function.h>
#include <AK/IntrusiveList.h>
#include <AK/MACAddress.h>
#include <AK/SinglyLinkedList.h>
#include <AK/Types.h>
#include <AK/WeakPtr.h>
#include <AK/Weakable.h>
@ -86,18 +86,26 @@ private:
IPv4Address m_ipv4_netmask;
IPv4Address m_ipv4_gateway;
struct PacketWithTimestamp {
KBuffer packet;
struct PacketWithTimestamp : public RefCounted<PacketWithTimestamp> {
PacketWithTimestamp(KBuffer buffer, Time timestamp)
: buffer(move(buffer))
, timestamp(timestamp)
{
}
KBuffer buffer;
Time timestamp;
IntrusiveListNode<PacketWithTimestamp, RefPtr<PacketWithTimestamp>> packet_node;
};
// FIXME: Make this configurable
static constexpr size_t max_packet_buffers = 1024;
SinglyLinkedList<PacketWithTimestamp> m_packet_queue;
using PacketList = IntrusiveList<PacketWithTimestamp, RefPtr<PacketWithTimestamp>, &PacketWithTimestamp::packet_node>;
PacketList m_packet_queue;
size_t m_packet_queue_size { 0 };
SinglyLinkedList<KBuffer> m_unused_packet_buffers;
size_t m_unused_packet_buffers_count { 0 };
PacketList m_unused_packets;
String m_name;
u32 m_packets_in { 0 };
u32 m_bytes_in { 0 };