From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
yrl.pp-manager.tt@hitachi.com
Subject: Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386
Date: Wed, 06 Jun 2012 10:46:26 -0400 [thread overview]
Message-ID: <1338993986.13348.549.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <4FCF6B27.2020008@hitachi.com>
On Wed, 2012-06-06 at 23:37 +0900, Masami Hiramatsu wrote:
> I agree with Frank. Register restoring should be done as far as the
> ftrace is used for kprobes. Of course, one reason is for the fault
> injection, which is very useful for debugging system failure. And
> another technical reason is that we should do "optimization"
> transparently. IMHO, kprobes works normally doing something,
> optimized kprobes also should do so.
>
> But if you introduce FTRACE_OPS_FL_RSTR_REGS flag for restoring
> registers, it could be possible to provide corresponding flag
> from kprobes side. (perhaps KPROBE_FLAG_NOMODREGS? :))
That's fine, my patch set restores the regs anyway.
-- Steve
next prev parent reply other threads:[~2012-06-06 14:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-05 10:27 [PATCH -tip v2 0/9]ftrace,kprobes: Ftrace-based kprobe optimization Masami Hiramatsu
2012-06-05 10:27 ` [PATCH -tip v2 1/9] ftrace: Add pt_regs acceptable trace callback Masami Hiramatsu
2012-06-05 10:27 ` [PATCH -tip v2 2/9] ftrace/x86-64: support SAVE_REGS feature on x86-64 Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386 Masami Hiramatsu
2012-06-05 20:37 ` Steven Rostedt
2012-06-05 21:24 ` Frank Ch. Eigler
2012-06-05 23:37 ` Steven Rostedt
2012-06-05 23:41 ` Frank Ch. Eigler
2012-06-06 14:37 ` Masami Hiramatsu
2012-06-06 14:46 ` Steven Rostedt [this message]
2012-06-05 21:51 ` Andi Kleen
2012-06-06 14:24 ` Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 4/9] ftrace: add ftrace_set_filter_ip() for address based filter Masami Hiramatsu
2012-08-21 15:09 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 5/9] kprobes: Inverse taking of module_mutex with kprobe_mutex Masami Hiramatsu
2012-08-21 15:09 ` [tip:perf/core] " tip-bot for Steven Rostedt
2012-06-05 10:28 ` [PATCH -tip v2 6/9] kprobes: cleanup to separate probe-able check Masami Hiramatsu
2012-08-21 15:10 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 7/9] kprobes: Move locks into appropriate functions Masami Hiramatsu
2012-08-21 15:11 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 8/9] kprobes: introduce ftrace based optimization Masami Hiramatsu
2012-08-21 15:13 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2012-06-05 10:28 ` [PATCH -tip v2 9/9] kprobes/x86: ftrace based optimization for x86 Masami Hiramatsu
2012-08-21 15:14 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2012-06-05 11:48 ` [PATCH -tip v2 0/9]ftrace,kprobes: Ftrace-based kprobe optimization Steven Rostedt
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