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Groups > linux.kernel > #1742177
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT |
| Date | 2017-09-29 16:50 +0200 |
| Message-ID | <uv4M3-7tm-51@gated-at.bofh.it> (permalink) |
| References | <urntU-3th-5@gated-at.bofh.it> <urnDA-3YD-3@gated-at.bofh.it> <uuBqG-5Tq-9@gated-at.bofh.it> <uuXUe-3aS-29@gated-at.bofh.it> <uuY3T-3eu-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 29 Sep 2017 09:37:55 +0200 Ingo Molnar <mingo@kernel.org> wrote: > > * Masami Hiramatsu <mhiramat@kernel.org> wrote: > > > On Thu, 28 Sep 2017 09:22:20 +0200 > > Ingo Molnar <mingo@kernel.org> wrote: > > > > > > > > * Masami Hiramatsu <mhiramat@kernel.org> wrote: > > > > > > > To enable jump optimized probe with CONFIG_PREEMPT, use > > > > synchronize_rcu_tasks() to wait for all tasks preempted > > > > on trampoline code back on track. > > > > > > This sentence does not parse. It's missing a verb, but I'm not sure. > > > > Hmm, how about this? > > > > Use synchthnize_rcu_tasks() to wait for all tasks preempted > > on trampoline code back on track so that jump optimized probe > > can be enabled with CONFIG_PREEMPT. > > What's "synchthnize"? ... Oops, it's my typo. my XPS touch pad is really unstable... > > More seriously, I still don't understand it. What is 'back on track'? > > Do you mean to say: > > We want to wait for all potentially preempted kprobes trampoline execution to > have completed. This guarantees that any freed trampoline memory is not in use > by any task in the system anymore. synchronize_rcu_tasks() gives such a > guarantee, so use it. Exactly, this is correct! Thank you, > > or something else? > > Thanks, > > Ingo -- Masami Hiramatsu <mhiramat@kernel.org>
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Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Ingo Molnar <mingo@kernel.org> - 2017-09-28 09:30 +0200
Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-29 09:30 +0200
Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Ingo Molnar <mingo@kernel.org> - 2017-09-29 09:40 +0200
Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-29 16:50 +0200
Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Ingo Molnar <mingo@kernel.org> - 2017-09-29 19:50 +0200
Re: [PATCH -tip v3 7/7] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-30 07:20 +0200
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