On Fri, Aug 21, 2015 at 10:34:41AM -0300, Arnaldo Carvalho dn Melo wrote:
> Em Thu, Aug 20, 2015 at 11:16:32AM -0400, Dean Nelson escreveu:
> > Running the following perf-stat command on an arm64 system produces the
> > following result...
>
> > [root@aarch64 ~]# perf stat -e kmem:mm_page_alloc -a sleep 1
> > Warning: [kmem:mm_page_alloc] function sizeof not defined
> > Warning: Error: expected type 4 but read 0
> > Segmentation fault
> > [root@aarch64 ~]#
>
> Jiri, while testing this I noticed that when running as !root I get:
>
> $ perf stat -e kmem:mm_page_alloc -a sleep 1
> event syntax error: 'kmem:mm_page_alloc'
> \___ unknown tracepoint
> Run 'perf list' for a list of valid events
yep, we need to hook it in.. I recall we discussed this already ;-)
so would something like this be ok:
$ perf stat -e kmem:mm_page_alloc -a sleep 1
event syntax error: 'kmem:mm_page_alloc'
\___ No permissions to read
/sys/kernel/debug/tracing/events/raw_syscalls/sys_(enter|exit)
Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug'
Run 'perf list' for a list of valid events
jirka
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