linux-kernel - [PATCH -tip 0/5] kprobes: batch (un)optimization support

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Message-ID: <20100510175313.27396.34605.stgit@localhost6.localdomain6>
Date:	Mon, 10 May 2010 13:53:13 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jim Keniston <jkenisto@...ibm.com>,
	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: [PATCH -tip 0/5] kprobes: batch (un)optimization support


Hi,

Since current kprobes jump optimization calls stop_machine() for each
probe, it will almost freeze machine when registering a lot of probes
(~1000) at once.
For avoiding this issue, this patch series enhances kprobes and
text_poke.

- Introduces text_poke_smp_batch() which modifies multiple codes
  with one stop_machine().
- Limits how many probes can be optimized at once.
- Introduce delayed unoptimization for batch processing.

text_poke_smp_batch() also helps Jason's Jump label to reduce
its overhead coming from text_poke_smp().

Currently, this patch allocates working memory static, however,
it is possible to allocate dynamically, because its not in
a critical section. it will be done by the next step, or next version.

Thank you,

---

Masami Hiramatsu (5):
      kprobes: Support delayed unoptimization
      kprobes/x86: Use text_poke_smp_batch
      x86: Introduce text_poke_smp_batch() for batch-code modifying
      kprobes: Limit maximum number of optimization at once
      [CLEANUP] kprobes: Remove redundant text_mutex lock in optimize


 arch/x86/include/asm/alternative.h |    7 +
 arch/x86/include/asm/kprobes.h     |    4 
 arch/x86/kernel/alternative.c      |   49 +++-
 arch/x86/kernel/kprobes.c          |   78 ++++++
 include/linux/kprobes.h            |    4 
 kernel/kprobes.c                   |  437 ++++++++++++++++++++++++------------
 6 files changed, 416 insertions(+), 163 deletions(-)

-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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