| From: |
| Srikar Dronamraju <srikar@linux.vnet.ibm.com> |
| To: |
| Ingo Molnar <mingo@elte.hu> |
| Subject: |
| [RFC] [PATCH 0/7] UBP, XOL and Uprobes |
| Date: |
| Mon, 11 Jan 2010 17:55:21 +0530 |
| Message-ID: |
| <20100111122521.22050.3654.sendpatchset@srikar.in.ibm.com> |
| Cc: |
| Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Peter Zijlstra <peterz@infradead.org>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
utrace-devel <utrace-devel@redhat.com>,
Mark Wielaard <mjw@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Masami Hiramatsu <mhiramat@redhat.com>,
Maneesh Soni <maneesh@in.ibm.com>,
Jim Keniston <jkenisto@us.ibm.com>,
LKML <linux-kernel@vger.kernel.org> |
| Archive‑link: | |
Article |
Hi,
This patchset implements Uprobes which enables you to dynamically
break into any routine in a user space application and collect
information non-disruptively. Uprobes is based on utrace and uses
x86 instruction decoder.
When a uprobe is registered, Uprobes makes a copy of the probed
instruction, stops the probed application, replaces the first
byte(s) of the probed instruction with a breakpoint instruction and
allows the probed application to continue. (Uprobes uses the same
copy-on-write mechanism so that the breakpoint affects only that
process.)
When a CPU hits the breakpoint instruction, Uprobes intercepts the
SIGTRAP and finds the associated uprobe. It then executes the
associated handler. Uprobes single-steps its copy of the probed
instruction and resumes execution of the probed process at the
instruction following the probepoint. Instruction copies to be
single-stepped are stored in a per-process "single-step out of line
(XOL) area,"
Uprobes can be used to take advantage of static markers available
in user space applications.
Advantages of uprobes over conventional debugging include:
1. Non-disruptive.
2. Uses Execution out of line(XOL),
3. Much better handling of multithreaded programs because of XOL.
4. No context switch between tracer, tracee.
Here is the list of TODO Items.
- Provide a perf interface to uprobes.
- Return probes.
- Support for Other Architectures.
- Jump optimization.
This patchset provides
Subject: [RFC] [PATCH 0/7] UBP, XOL and Uprobes
Subject: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
Subject: [RFC] [PATCH 2/7] x86 support for UBP
Subject: [RFC] [PATCH 3/7] Execution out of line (XOL)
Subject: [RFC] [PATCH 4/7] Uprobes Implementation
Subject: [RFC] [PATCH 5/7] X86 Support for Uprobes
Subject: [RFC] [PATCH 6/7] Uprobes Documentation
Subject: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes
This patchset is based on
git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-utrace.git
If and when utrace gets accepted into tip tree or Mainline, I will rebase
this patchset.
Please do provide your valuable comments.
--
Thanks and Regards
Srikar
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