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metrics: boot time: kernel 'last line' has changed upstream #1036
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grahamwhaley
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Jan 10, 2019
The kernel dmesg output has changed around the 'Freeing kernel memory', which we search for to try and identify the 'end of kernel' boot time. Update the search expression we use to find the last instance of these lines - which was as easy as trimming the 'memory' word from the end of the expression, which now works for both older and newer kernel demsg outputs. As an example of how the outputs changed, here is a grep of two logs (taken from bare metal hosts btw, not Kata Container boots): $ grep "Freeing unused kernel" *log newlog:[ 2.243048] Freeing unused kernel image memory: 2180K newlog:[ 2.248191] Freeing unused kernel image memory: 2012K newlog:[ 2.248337] Freeing unused kernel image memory: 120K oldlog:[ 2.462519] Freeing unused kernel memory: 1528K oldlog:[ 2.483732] Freeing unused kernel memory: 1664K oldlog:[ 2.484299] Freeing unused kernel memory: 92K Fixes: kata-containers#1036 Signed-off-by: Graham Whaley <graham.whaley@intel.com>
GabyCT
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Feb 27, 2019
The kernel dmesg output has changed around the 'Freeing kernel memory', which we search for to try and identify the 'end of kernel' boot time. Update the search expression we use to find the last instance of these lines - which was as easy as trimming the 'memory' word from the end of the expression, which now works for both older and newer kernel demsg outputs. As an example of how the outputs changed, here is a grep of two logs (taken from bare metal hosts btw, not Kata Container boots): $ grep "Freeing unused kernel" *log newlog:[ 2.243048] Freeing unused kernel image memory: 2180K newlog:[ 2.248191] Freeing unused kernel image memory: 2012K newlog:[ 2.248337] Freeing unused kernel image memory: 120K oldlog:[ 2.462519] Freeing unused kernel memory: 1528K oldlog:[ 2.483732] Freeing unused kernel memory: 1664K oldlog:[ 2.484299] Freeing unused kernel memory: 92K Fixes: kata-containers#1036 Signed-off-by: Graham Whaley <graham.whaley@intel.com>
GabyCT
pushed a commit
to GabyCT/tests-1
that referenced
this issue
Feb 27, 2019
The kernel dmesg output has changed around the 'Freeing kernel memory', which we search for to try and identify the 'end of kernel' boot time. Update the search expression we use to find the last instance of these lines - which was as easy as trimming the 'memory' word from the end of the expression, which now works for both older and newer kernel demsg outputs. As an example of how the outputs changed, here is a grep of two logs (taken from bare metal hosts btw, not Kata Container boots): $ grep "Freeing unused kernel" *log newlog:[ 2.243048] Freeing unused kernel image memory: 2180K newlog:[ 2.248191] Freeing unused kernel image memory: 2012K newlog:[ 2.248337] Freeing unused kernel image memory: 120K oldlog:[ 2.462519] Freeing unused kernel memory: 1528K oldlog:[ 2.483732] Freeing unused kernel memory: 1664K oldlog:[ 2.484299] Freeing unused kernel memory: 92K Fixes: kata-containers#1036 Signed-off-by: Graham Whaley <graham.whaley@intel.com>
GabyCT
pushed a commit
to GabyCT/tests-1
that referenced
this issue
Feb 27, 2019
The kernel dmesg output has changed around the 'Freeing kernel memory', which we search for to try and identify the 'end of kernel' boot time. Update the search expression we use to find the last instance of these lines - which was as easy as trimming the 'memory' word from the end of the expression, which now works for both older and newer kernel demsg outputs. As an example of how the outputs changed, here is a grep of two logs (taken from bare metal hosts btw, not Kata Container boots): $ grep "Freeing unused kernel" *log newlog:[ 2.243048] Freeing unused kernel image memory: 2180K newlog:[ 2.248191] Freeing unused kernel image memory: 2012K newlog:[ 2.248337] Freeing unused kernel image memory: 120K oldlog:[ 2.462519] Freeing unused kernel memory: 1528K oldlog:[ 2.483732] Freeing unused kernel memory: 1664K oldlog:[ 2.484299] Freeing unused kernel memory: 92K Fixes: kata-containers#1036 Signed-off-by: Graham Whaley <graham.whaley@intel.com>
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Looks like the kernel has changed the exact lines it prints out when finally freeing up un-used memory after initial boot - which we use in the boot time metrics test to grab a timestamp...
Should be easy enough to make that check handle both the old and the new style with some extra grepping or some regexp etc.
I've not tracked down specifically which kernel version the change got merged in, but the patch is here I think.
This cropped up over at kata-containers/runtime#1100
where you can see the output of a newer kernel:
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