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block: skip automatic zero-init of large array in ioq_submit

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The 'ioq_submit' method has a struct array that is 8k in size.
Skip the automatic zero-init of this array to eliminate the
performance overhead in the I/O hot path.

The 'iocbs' array will selectively initialized when processing
the I/O data.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-4-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:41 +01:00 committed by Stefan Hajnoczi
parent ba2868ce09
commit 83750c1da8
1 changed files with 1 additions and 1 deletions
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block/linux-aio.c
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@ -291,7 +291,7 @@ static void ioq_submit(LinuxAioState *s)
{ {
int ret, len; int ret, len;
struct qemu_laiocb *aiocb; struct qemu_laiocb *aiocb;
struct iocb *iocbs[MAX_EVENTS]; QEMU_UNINITIALIZED struct iocb *iocbs[MAX_EVENTS];
QSIMPLEQ_HEAD(, qemu_laiocb) completed; QSIMPLEQ_HEAD(, qemu_laiocb) completed;
do { do {