Messages in this thread | | | Date | Wed, 20 Nov 2013 12:56:49 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH -tip v3 00/23] kprobes: introduce NOKPROBE_SYMBOL() and general cleaning of kprobe blacklist |
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On Wed, 20 Nov 2013 12:36:00 -0500 "Frank Ch. Eigler" <fche@redhat.com> wrote:
> Hi - > > > > Does this new blacklist cover enough that the kernel now survives a > > > broadly wildcarded perf-probe, e.g. over e.g. all of its kallsyms? > > > > That's generally the purpose of the annotations - if it doesn't then > > that's a bug. > > AFAIK, no kernel since kprobes was introduced has ever stood up to > that test. perf probe lacks the wildcarding powers of systemtap, so > one needs to resort to something like: > > # cat /proc/kallsyms | grep ' [tT] ' | while read addr type symbol; do > perf probe $symbol > done
I'm curious to why one would do that. IIUC, perf now has function tracing support.
-- Steve
> > then wait for a few hours for that to finish. Then, or while the loop > is still running, run > > # perf record -e 'probe:*' -aR sleep 1 > > to take a kernel down. > > > - FChE
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