2015-09-11 16:22 GMT-04:00 Arnaldo Carvalho de Melo <arnaldo.m...@gmail.com>: > Em Fri, Sep 11, 2015 at 03:56:44PM -0400, Raphaël Beamonte escreveu: >> Another possibility would be to have another perf command, sort of a >> "perf remountfs", to run with sudo and that would make itself both >> checks and remount accordingly the two fs. > > This part maybe more interesting, so I'll focus on it, yeah, having a: > 'perf fixperms' command (have a better name? :) ) may make sense, would > need context tho, i.e. something like: > > perf fixperms trace > > Or: > > perf fixperms top > > But then, perhaps in that case: > > $ trace ls > Error: 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' > > We could just add some more text saying that please check as well that > the other parts of the path we're trying to access are available once > the suggestion is followed.
Wouldn't it be almost the same as your "Something is wrong with tracefs and/or debugfs, figure it out and try again" ? ;o) I think that if the 'fixperms' need a context, we could as well give the 'perf fixperms' command to type directly in the Hint, such as: $ trace ls Error: No permissions to read /sys/kernel/debug/tracing/events/raw_syscalls/sys_(enter|exit) Hint: Try 'sudo perf fixperms trace' It would be the same as the current copy/paste, but one command that would fix the situation directly, instead of having to check the permissions of each level in the path. A little bit user-friendlier! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
