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[host] use a local copy of the header and then update it all in one go

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Writing to shared memory is much faster then reading as the shared
memory is not cached, this change ensures we are using a local copy
of the header performing the final update all in one go.
This commit is contained in:
Geoffrey McRae 2017-12-16 10:04:56 +11:00
parent b89a8fee04
commit 758b7af754
2 changed files with 41 additions and 32 deletions
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70
host/Service.cpp
View file

@ -40,7 +40,7 @@ Service::Service() :
m_memory(NULL),
m_timer(NULL),
m_capture(NULL),
m_header(NULL),
m_shmHeader(NULL),
m_frameIndex(0),
m_cursorDataSize(0),
m_cursorData(NULL),
@ -92,15 +92,15 @@ bool Service::Initialize(ICapture * captureDevice)
}
// update everything except for the hostID
memcpy(m_header->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_header->version = KVMFR_HEADER_VERSION;
m_header->guestID = m_ivshmem->GetPeerID();
m_header->updateCount = 0;
memcpy(m_shmHeader->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_shmHeader->version = KVMFR_HEADER_VERSION;
m_shmHeader->guestID = m_ivshmem->GetPeerID();
m_shmHeader->updateCount = 0;
// clear but retain the restart flag if it was set by the client
INTERLOCKED_AND8((char *)&m_header->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_header->frame , sizeof(KVMFRFrame ));
ZeroMemory(&m_header->cursor, sizeof(KVMFRCursor));
INTERLOCKED_AND8((char *)&m_shmHeader->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_shmHeader->frame , sizeof(KVMFRFrame ));
ZeroMemory(&m_shmHeader->cursor, sizeof(KVMFRCursor));
m_initialized = true;
return true;
@ -108,7 +108,7 @@ bool Service::Initialize(ICapture * captureDevice)
bool Service::InitPointers()
{
m_header = reinterpret_cast<KVMFRHeader *>(m_memory);
m_shmHeader = reinterpret_cast<KVMFRHeader *>(m_memory);
m_frame[0] = (uint8_t *)(((uintptr_t)m_memory + sizeof(KVMFRHeader *) + 0x7F) & ~0x7F);
m_frameSize = ((m_ivshmem->GetSize() - (m_frame[0] - m_memory)) & ~0x7F) >> 1;
m_frame[1] = m_frame[0] + m_frameSize;
@ -142,7 +142,7 @@ void Service::DeInitialize()
m_cursorData = NULL;
}
m_header = NULL;
m_shmHeader = NULL;
m_frame[0] = NULL;
m_frame[1] = NULL;
m_dataOffset[0] = 0;
@ -171,7 +171,7 @@ bool Service::Process()
frame.buffer = m_frame[m_frameIndex];
frame.bufferSize = m_frameSize;
volatile uint8_t *flags = &m_header->flags;
volatile uint8_t *flags = &m_shmHeader->flags;
// wait for the host to notify that is it is ready to proceed
while (true)
@ -181,7 +181,7 @@ bool Service::Process()
// check if the client has flagged a restart
if (f & KVMFR_HEADER_FLAG_RESTART)
{
m_header->updateCount = 0;
m_shmHeader->updateCount = 0;
INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_RESTART));
restart = true;
break;
@ -252,17 +252,17 @@ bool Service::Process()
}
uint8_t updateFlags = 0;
m_header->cursor.flags = 0;
m_header.cursor.flags = 0;
if (!cursorOnly)
{
// signal a frame update
updateFlags |= KVMFR_HEADER_FLAG_FRAME;
m_header->frame.type = m_capture->GetFrameType();
m_header->frame.width = frame.width;
m_header->frame.height = frame.height;
m_header->frame.stride = frame.stride;
m_header->frame.dataPos = m_dataOffset[m_frameIndex];
m_header.frame.type = m_capture->GetFrameType();
m_header.frame.width = frame.width;
m_header.frame.height = frame.height;
m_header.frame.stride = frame.stride;
m_header.frame.dataPos = m_dataOffset[m_frameIndex];
if (++m_frameIndex == 2)
m_frameIndex = 0;
}
@ -280,11 +280,11 @@ bool Service::Process()
// tell the host where the cursor is
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_POS;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_POS;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.x = m_cursor.x;
m_header->cursor.y = m_cursor.y;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header.cursor.x = m_cursor.x;
m_header.cursor.y = m_cursor.y;
}
if (frame.cursor.hasShape || m_shapePending || (m_cursor.hasShape && restart))
@ -323,15 +323,15 @@ bool Service::Process()
{
// give the host the new cursor shape
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.type = m_cursor.type;
m_header->cursor.w = m_cursor.w;
m_header->cursor.h = m_cursor.h;
m_header->cursor.pitch = m_cursor.pitch;
m_header->cursor.dataPos = m_dataOffset[m_frameIndex];
m_header.cursor.type = m_cursor.type;
m_header.cursor.w = m_cursor.w;
m_header.cursor.h = m_cursor.h;
m_header.cursor.pitch = m_cursor.pitch;
m_header.cursor.dataPos = m_dataOffset[m_frameIndex];
memcpy(m_frame[m_frameIndex], m_cursorData, m_cursor.dataSize);
m_shapePending = false;
@ -344,8 +344,16 @@ bool Service::Process()
INTERLOCKED_AND8((volatile char *)flags, KVMFR_HEADER_FLAG_RESTART);
INTERLOCKED_OR8 ((volatile char *)flags, updateFlags);
// increment the update count to resume the host
++m_header->updateCount;
// update the shared header but don't touch the setup fields
const size_t offset = (uintptr_t)&m_header.frame - (uintptr_t)&m_header;
memcpy(
(uint8_t *)m_shmHeader + offset,
(uint8_t *)&m_header + offset,
sizeof(KVMFRHeader) - offset
);
// increment the update count so the guest stops waiting
++m_shmHeader->updateCount;
return true;
}

3
host/Service.h
View file

@ -54,7 +54,8 @@ private:
HANDLE m_timer;
ICapture * m_capture;
KVMFRHeader * m_header;
KVMFRHeader m_header;
KVMFRHeader * m_shmHeader;
uint8_t * m_frame[2];
size_t m_frameSize;
uint64_t m_dataOffset[2];