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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:36:53 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:15 -0400 |
| commit | ce14f24611aa0469b464a9512e192b4fd51dca2b (patch) | |
| tree | 05bec02e104d284a14a9c09d7867e87296667405 | |
| parent | 8b1dac1ad57082611419b0e2f347acd96115d25f (diff) | |
| download | qemu-ce14f24611aa0469b464a9512e192b4fd51dca2b.zip qemu-ce14f24611aa0469b464a9512e192b4fd51dca2b.tar.gz qemu-ce14f24611aa0469b464a9512e192b4fd51dca2b.tar.bz2 | |
hw/dma/xlnx_csu_dma: skip automatic zero-init of large array
The 'xlnx_csu_dma_src_notify' method has a 4k byte array used for
copying DMA data. Skip the automatic zero-init of this array to
eliminate the performance overhead in the I/O hot path.
The 'buf' array will be fully initialized when data is copied.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-16-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | hw/dma/xlnx_csu_dma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/dma/xlnx_csu_dma.c b/hw/dma/xlnx_csu_dma.c index 3db3904..d8c7da1 100644 --- a/hw/dma/xlnx_csu_dma.c +++ b/hw/dma/xlnx_csu_dma.c @@ -287,7 +287,7 @@ static uint32_t xlnx_csu_dma_advance(XlnxCSUDMA *s, uint32_t len) static void xlnx_csu_dma_src_notify(void *opaque) { XlnxCSUDMA *s = XLNX_CSU_DMA(opaque); - unsigned char buf[4 * 1024]; + QEMU_UNINITIALIZED unsigned char buf[4 * 1024]; size_t rlen = 0; ptimer_transaction_begin(s->src_timer); |