Wind River Support Network

Description

While looking at the block I/O tracing utilities and the below command helps in dumping per process disk read/write in KB/sec which would be very helpful debug/analysis.

This utility is working fine in wrl6 but  on wrl9 seems to be hitting this minor bug ([https://bugzilla.redhat.com/show_bug.cgi?id=1321875]). (this is fixed in upstream later),

On wrl9 ->

root@tahoma-node:~# btrace -s /dev/sda5

FAILED to start thread on CPU 8: 22/Invalid argument

FAILED to start thread on CPU 9: 22/Invalid argument

FAILED to start thread on CPU 10: 22/Invalid argument

FAILED to start thread on CPU 11: 22/Invalid argument

FAILED to start thread on CPU 12: 22/Invalid argument

FAILED to start thread on CPU 13: 22/Invalid argument

FAILED to start thread on CPU 14: 22/Invalid argument

FAILED to start thread on CPU 15: 22/Invalid argument

(curtailed output for reference after running for less than a minute)

# cat /proc/cmdline

BOOT_IMAGE=/vmlinuz root=LABEL=jrootb_P ro quiet pcie_port_pm=off libata.force=noncq isolcpus=2-7 enforcing=0 pci=resource_alignment=00:1f.3;09:0d.0 rootdelay=5 unknown_nmi_panic=1 ro max_loop=255 console=ttyS0,9600 crashkernel=512M {color:#FF0000}*maxcpus=8*{color} acpi_enforce_resources=lax

root@tahoma-node:~# cat /sys/devices/system/cpu/online

0-7

root@tahoma-node:~#

root@tahoma-node:~# cat /sys/devices/system/cpu/offline

8-15

-----

Looking into source code for "blktrace" I observed upstream fix 80c4041b2e7a7d5afb75df563bf51bb27773c095 is missing in WRL9 whereas it is available in LTS18,

https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/blktrace/+/80c4041b2e7a7d5afb75df563bf51bb27773c095%5E!/

https://bugzilla.redhat.com/show_bug.cgi?id=1321875

Workaround

NA

Steps to Reproduce

Active in customer env.

Host - WR9.0.0.20_ovp 

Project configration:
 --dl-layers --distros wrlinux-ovp --machines intel-x86-64 --templates feature/initramfs,feature/kdump,feature/kexec,feature/kernel-ovp-kvm,feature/sysklogd,feature/dpdk,feature/package-management --layers wr-kernel wr-ovp

Add "blktrace" into build by adding IMAGE_INSTALL_append = " blktrace"

bitbake wrlinux-image-ovp-kvm

Deploy host image to target.

# blktrace -w 1 -d /dev/sda

OR

# btrace -s /dev/sda