Em Tue, Oct 20, 2015 at 12:23:48AM +0900, Namhyung Kim escreveu: > Currently, when perf test is run by a normal user, it'll fail to access > tracepoint events. However the output is somewhat messy since it tries > to be nice with long error messages and hints. IMHO it's not needed > for 'perf test' by default and AFAIK the perf test uses pr_debug() > rather than pr_err() for such messages so that one can use -v option to > see further details on failed testcases if needed. > > Before: > $ perf test > 1: vmlinux symtab matches kallsyms : FAILED! > 2: detect openat syscall event :Error: > No permissions to read > /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat > Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' > FAILED! > 3: detect openat syscall event on all cpus :Error: > No permissions to read > /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat > Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' > FAILED! > ... > > After: > $ perf test > 1: vmlinux symtab matches kallsyms : FAILED! > 2: detect openat syscall event : FAILED! > 3: detect openat syscall event on all cpus : FAILED! > ... > > $ perf test -v 2 > 2: detect openat syscall event : > --- start --- > test child forked, pid 30575 > Error: No permissions to read > /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat > Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' > > test child finished with -1 > ---- end ---- > detect openat syscall event: FAILED!
Here I get useless informational messages about registering plugins, guess those should move to pr_debug2, no? Anyway, applying the patch, the common case is to run 'perf test'. [acme@zoo linux]$ perf test -v 2 2: detect openat syscall event : --- start --- test child forked, pid 22866 registering plugin: /home/acme/.traceevent/plugins/plugin_function.so registering plugin: /home/acme/.traceevent/plugins/plugin_mac80211.so registering plugin: /home/acme/.traceevent/plugins/plugin_scsi.so registering plugin: /home/acme/.traceevent/plugins/plugin_hrtimer.so registering plugin: /home/acme/.traceevent/plugins/plugin_sched_switch.so registering plugin: /home/acme/.traceevent/plugins/plugin_cfg80211.so registering plugin: /home/acme/.traceevent/plugins/plugin_kmem.so registering plugin: /home/acme/.traceevent/plugins/plugin_kvm.so registering plugin: /home/acme/.traceevent/plugins/plugin_xen.so registering plugin: /home/acme/.traceevent/plugins/plugin_jbd2.so Error: No permissions to read /sys/kernel/debug/tracing/events/syscalls/sys_enter_openat Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' test child finished with -1 ---- end ---- detect openat syscall event: FAILED! [acme@zoo linux]$ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
