From: Andi Kleen <andi@firstfloor.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
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>,
"Frank Ch. Eigler" <fche@redhat.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: Tue, 05 Jun 2012 14:51:18 -0700 [thread overview]
Message-ID: <m2ehptjull.fsf@firstfloor.org> (raw)
In-Reply-To: <20120605102802.27845.49309.stgit@localhost.localdomain> (Masami Hiramatsu's message of "Tue, 05 Jun 2012 19:28:02 +0900")
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> writes:
>
> + .macro FTRACE_SAVE_ALL
> + /* eflags is saved on cs */
> + subl $8, %esp /* skip ip and orig_ax */
> + pushl %gs
> + pushl %fs
For pure in kernel use you don't need to save/restore fs/gs
This is only needed on kernel/user space boundaries.
And for this usage probably also not flags
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2012-06-05 21:51 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
2012-06-05 21:51 ` Andi Kleen [this message]
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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