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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:36:42 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:39:08 -0400 |
| commit | a503bdc22b91869e3bf45522e36b122889465306 (patch) | |
| tree | d4a07aceaf614c6ce86a2c23ee6f608d9ea993e9 /chardev/char-fd.c | |
| parent | 83750c1da807c973b0b11d977d61df7e41122d03 (diff) | |
| download | focaccia-qemu-a503bdc22b91869e3bf45522e36b122889465306.tar.gz focaccia-qemu-a503bdc22b91869e3bf45522e36b122889465306.zip | |
chardev/char-fd: skip automatic zero-init of large array
The 'fd_chr_read' method has a 4k byte array used for copying data between the socket 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 network socket. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20250610123709.835102-5-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'chardev/char-fd.c')
| -rw-r--r-- | chardev/char-fd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/chardev/char-fd.c b/chardev/char-fd.c index 23bfe3c0b1..6f03adf872 100644 --- a/chardev/char-fd.c +++ b/chardev/char-fd.c @@ -50,7 +50,7 @@ static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque) Chardev *chr = CHARDEV(opaque); FDChardev *s = FD_CHARDEV(opaque); int len; - uint8_t buf[CHR_READ_BUF_LEN]; + QEMU_UNINITIALIZED uint8_t buf[CHR_READ_BUF_LEN]; ssize_t ret; len = sizeof(buf); |