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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:37:06 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:16 -0400 |
| commit | ca0559e2350c618048f7caf80cb79c1259e7cfd2 (patch) | |
| tree | 35c7f7bb952ec7810b1c2753702435aa767ca547 /scripts/tracetool/backend/ust.py | |
| parent | 55243edf42ee87bce9f36ca251f3ab9cda1563e4 (diff) | |
| download | focaccia-qemu-ca0559e2350c618048f7caf80cb79c1259e7cfd2.tar.gz focaccia-qemu-ca0559e2350c618048f7caf80cb79c1259e7cfd2.zip | |
hw/scsi/megasas: skip automatic zero-init of large arrays
The 'megasas_dcmd_pd_get_list' and 'megasas_dcmd_get_properties'
methods have 4k structs 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 'info' structs are 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 arrays are 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>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-id: 20250610123709.835102-29-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'scripts/tracetool/backend/ust.py')
0 files changed, 0 insertions, 0 deletions