Messages in this thread | | | Date | Fri, 21 Aug 2015 16:03:10 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH v3] tools lib traceevent: add checks for returned EVENT_ERROR type |
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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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