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

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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>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:43 +01:00 • committed by Stefan Hajnoczi
parent a503bdc22b
commit 45bb7fb21c
1 changed files with 1 additions and 1 deletions
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2
chardev/char-pty.c
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@ -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);