linux-kernel - [PATCH v2 0/6] mips-specific ftrace support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <cover.1243604390.git.wuzj@lemote.com>
Date:	Fri, 29 May 2009 22:58:08 +0800
From:	wuzhangjin@...il.com
To:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Cc:	Wu Zhangjin <wuzj@...ote.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: [PATCH v2 0/6] mips-specific ftrace support

From: Wu Zhangjin <wuzj@...ote.com>

ftrace is a mcount based kernel tracing tool/framework, which is originally
from RT_PREEMPT(http://rt.wiki.kernel.org).

ftrace is short for function tracer, this is its original name, but now, it
becomes a kernel tracing framework, lots of kernel tracers are built on it,
such as irqoff tracer, wakeup tracer and so forth.  these tracers are
arch-independent(?), but some of them are arch-dependent, such as the original
ftrace: function tracer, and dynamic function tracer, function graph tracer,
and also, system call tracer.

here is the mips porting of these four arch-dependent tracers, it will enable
the following new kernel config options in linux-mips system.

kernel hacking --->
           Tracers -->
                [*] Kernel Function Tracer
                [*]   Kernel Function Graph Tracer
                ...
                [*] Trace syscalls
                                ...
                [*] enable/disable ftrace tracepoints dynamically

in reality, because the timestamp getting function are arch-dependent, lots of
the tracers are arch-dependent. the arch-dependent part is that: sched_clock.
the original sched_clock in mips is jiffes based, only give 10ms precision in
1000HZ, which is not enough for ftrace. to get high-precise timestamp, we must
implement a new native_sched_clock via reading the MIPS clock counter, but
since it is only 32bit long, so, overflow should be handled carefully.

this -v2 patch series is based on the -v1 patch series and incorporates the
feedback from Steven Rostedt and Thomas Gleixner.

read the following document, and play with it:
        Documentation/trace/ftrace.txt

Wu Zhangjin (6):
  mips static function tracer support
  mips dynamic function tracer support
  add an endian argument to scripts/recordmcount.pl
  mips function graph tracer support
  mips specific clock function to get precise timestamp
  mips specific system call tracer

 arch/mips/Kconfig                   |    7 +
 arch/mips/Makefile                  |    2 +
 arch/mips/include/asm/ftrace.h      |   35 ++++-
 arch/mips/include/asm/ptrace.h      |    2 +
 arch/mips/include/asm/reg.h         |    5 +
 arch/mips/include/asm/syscall.h     |   84 +++++++++
 arch/mips/include/asm/thread_info.h |    5 +-
 arch/mips/kernel/Makefile           |   12 ++
 arch/mips/kernel/csrc-r4k.c         |    2 +-
 arch/mips/kernel/entry.S            |    2 +-
 arch/mips/kernel/ftrace.c           |  350 +++++++++++++++++++++++++++++++++++
 arch/mips/kernel/ftrace_clock.c     |   71 +++++++
 arch/mips/kernel/mcount.S           |  185 ++++++++++++++++++
 arch/mips/kernel/mips_ksyms.c       |    5 +
 arch/mips/kernel/ptrace.c           |   14 ++-
 arch/mips/kernel/scall64-o32.S      |    2 +-
 arch/mips/kernel/vmlinux.lds.S      |    1 +
 kernel/trace/trace_clock.c          |    2 +-
 scripts/Makefile.build              |    1 +
 scripts/recordmcount.pl             |   32 +++-
 20 files changed, 805 insertions(+), 14 deletions(-)
 create mode 100644 arch/mips/include/asm/syscall.h
 create mode 100644 arch/mips/kernel/ftrace.c
 create mode 100644 arch/mips/kernel/ftrace_clock.c
 create mode 100644 arch/mips/kernel/mcount.S

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/