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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:37:01 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:16 -0400 |
| commit | 7eeb1d3acc175813ad3d5e824f26123e0992093a (patch) | |
| tree | bc6520979fcbd5902d2fa3a9a868ea8a2c78fd37 /hw/avr/arduino.c | |
| parent | 8b723287b84a62bb5d1a7799ef0959ca8e6c293a (diff) | |
| download | qemu-7eeb1d3acc175813ad3d5e824f26123e0992093a.zip qemu-7eeb1d3acc175813ad3d5e824f26123e0992093a.tar.gz qemu-7eeb1d3acc175813ad3d5e824f26123e0992093a.tar.bz2 | |
hw/nvme/ctrl: skip automatic zero-init of large arrays
The 'nvme_map_sgl' method has a 256 element array used for copying
data from the device. Skip the automatic zero-init of this array
to eliminate the performance overhead in the I/O hot path.
The 'segment' array will be fully initialized when reading data from
the device.
The 'nme_changed_nslist' method has a 4k byte array that is manually
initialized with memset(). The compiler ought to be intelligent
enough to turn the memset() into a static initialization operation,
and thus not duplicate the automatic zero-init. Replacing memset()
with '{}' makes it unambiguous that the array is statically initialized.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Message-id: 20250610123709.835102-24-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'hw/avr/arduino.c')
0 files changed, 0 insertions, 0 deletions