chardev/char-pty: skip automatic zero-init of large array

The 'pty_chr_read' method has a 4k byte array used for copying
data between the PTY and device. 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 reading data off
the PTY.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-6-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/chardev/char-pty.c b/chardev/char-pty.c
index c28554e6e02ec738df4f65dee1a655205ede5ad9..674e9b3f1448fc400ec67d832242f72e4f825153 100644 (file)
--- a/chardev/char-pty.c
+++ b/chardev/char-pty.c
@@ -154,7 +154,7 @@ static gboolean pty_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
     Chardev *chr = CHARDEV(opaque);
     PtyChardev *s = PTY_CHARDEV(opaque);
     gsize len;
-    uint8_t buf[CHR_READ_BUF_LEN];
+    QEMU_UNINITIALIZED uint8_t buf[CHR_READ_BUF_LEN];
     ssize_t ret;
 
     len = sizeof(buf);