* Ananth N Mavinakayanahalli ana...@in.ibm.com wrote:
On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote:
...
When we merged kprobes ~10 years ago we made the (rather bad) mistake of
merging a raw, opaque facility and leaving 'the rest' up to some other
entity.
IBM
* Ananth N Mavinakayanahalli ana...@in.ibm.com wrote:
On Fri, Jan 29, 2010 at 10:11:16AM +0100, Ingo Molnar wrote:
* Ananth N Mavinakayanahalli ana...@in.ibm.com wrote:
On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote:
...
When we merged kprobes ~10 years
* Jim Keniston jkeni...@us.ibm.com wrote:
On Wed, 2010-01-27 at 09:54 +0100, Ingo Molnar wrote:
...
I think the best solution for user probes (by far) is to use a simplified
in-kernel instruction emulator for the few common probes instruction.
(Kprobes
already partially decodes x86
* Peter Zijlstra pet...@infradead.org wrote:
On Tue, 2010-01-26 at 15:37 -0800, Linus Torvalds wrote:
On Tue, 26 Jan 2010, Tom Tromey wrote:
In non-stop mode (where you can stop one thread but leave the others
running), gdb wants to have the breakpoints always inserted. So,
* Avi Kivity a...@redhat.com wrote:
On 01/27/2010 10:24 AM, Ingo Molnar wrote:
Not to mention that that process could wreck the trace data rendering it
utterly unreliable.
It could, but it also might not. Are we going to deny high performance
tracing to users just because it doesn't
* Avi Kivity a...@redhat.com wrote:
If so then you ignore the obvious solution to _that_ problem: dont use
INT3 at all, but rebuild (or re-JIT) your program with explicit callbacks.
It's _MUCH_ faster than _any_ breakpoint based solution - literally just
the cost of a function call
* Thomas Gleixner t...@linutronix.de wrote:
On Mon, 25 Jan 2010, Steven Rostedt wrote:
On Mon, 2010-01-25 at 10:12 -0800, Linus Torvalds wrote:
But on the whole, I think it's actually worked out pretty well for them.
I think the mainline kernel has improved in the process, but I
* Kyle Moffett k...@moffetthome.net wrote:
On Fri, Jan 22, 2010 at 19:22, Linus Torvalds
torva...@linux-foundation.org wrote:
There are cases where we really _want_ to have common code. We want to
have a common VFS interface because we want to show _one_ interface to
user space across a
* Ingo Molnar mi...@elte.hu wrote:
* Ananth N Mavinakayanahalli ana...@in.ibm.com wrote:
On Wed, Jan 20, 2010 at 06:49:50AM +0100, Ingo Molnar wrote:
Ingo,
Note, i'm not yet convinced that this (and the rest: uprobes and
systemtap,
etc.) can go uptream in its present
* Frank Ch. Eigler f...@redhat.com wrote:
[...]
If the in-kernel gdb stub replaced kgdb functionally you'd hear no
complaints from me.
Let's leave it as an idea for the future.
We came a full circle - that's the argument. We say overlap, duplication
and incomplete implementation in
* Frank Ch. Eigler f...@redhat.com wrote:
Hi -
Only in name. One is highly invasive, for debugging the kernel across
serial consoles. The other is highly noninvasive, for debugging user
processes across normal userspace channels. They both happen to talk
to gdb, but that's
* Frank Ch. Eigler f...@redhat.com wrote:
peterz wrote:
Hmm,. wouldn't it make much more sense to extend the current kgdb stub
to include userspace debugging, providing an all-in-one solution?
I think it would be much more powerful to be able to observe the full
software stack and
* Christoph Hellwig h...@infradead.org wrote:
[...] Given that's it's pretty much too later for the 2.6.33 cycle
anyway I'd suggest you make sure the remaining two major architectures
(arm and mips) get converted, and if the remaining minor architectures
don't manage to get their
* Christoph Hellwig h...@infradead.org wrote:
On Thu, Nov 26, 2009 at 10:10:52AM +0100, Ingo Molnar wrote:
[...] Given that's it's pretty much too later for the 2.6.33 cycle
anyway I'd suggest you make sure the remaining two major architectures
(arm and mips) get converted
* Oleg Nesterov o...@redhat.com wrote:
Much better. But in this case please note that most of tracehooks just
do:
if (unlikely(task_utrace_flags(current) SOME_EVENT))
utrace_report_some_event();
I really don't understand why we shouldn't have
* Roland McGrath rol...@redhat.com wrote:
Here is a trivial module to implement the seccomp guts via utrace.
I haven't tested it at all. (AFAIK it was only ever used by
cpushare, and that project might be defunct now.)
I'm not sure what Ingo had in mind for integrating this. If it's
* Ananth N Mavinakayanahalli ana...@in.ibm.com wrote:
nice! The simplification factor is already significant:
18 files changed, 116 insertions(+), 175 deletions(-)
That is what we want - to remove special TIF flag uses and replace
them with utrace driven machinery.
Another
* Roland McGrath rol...@redhat.com wrote:
Regarding ptrace-via-utrace. What is the plan there? Am i looking
the right branch:
| earth4:~/linux.trees.git git diff --stat
| linus/master..utrace/utrace-ptrace kernel/ptrace.c
arch/x86/kernel/ptrace.c
| kernel/ptrace.c | 803
* Roland McGrath rol...@redhat.com wrote:
kernel/utrace.c should probably be introduced as
kernel/trace/utrace.c not kernel/utrace.c. It also overlaps pending
work in the tracing tree and cooperation would be nice and desired.
Of course I would like to cooperate with everyone. And of
* Frank Ch. Eigler f...@redhat.com wrote:
Hi -
On Sat, Mar 21, 2009 at 04:45:01PM +0100, Ingo Molnar wrote:
[...]
To me personally there are two big direct usability issues with
SystemTap:
1) It relies on DEBUG_INFO for any reasonable level of utility.
Yes, it will limp
* Linus Torvalds torva...@linux-foundation.org wrote:
On Sat, 21 Mar 2009, Frank Ch. Eigler wrote:
If testing utrace against its main application requires installation
of a complete enterprise distro from a distro [...]
This has *never* been a requirement.
You guys are getting
* Ingo Molnar mi...@elte.hu wrote:
Total download size: 329 M
That size of a _compressed_ debuginfo kernel package is obscene.
We can fit 4 years of full Linux kernel Git history into that size
- 60,000+ commits, full metadata and full 20 million lines of code
flux included
* Roland McGrath rol...@redhat.com wrote:
From: Frank Ch. Eigler f...@redhat.com
This is v2 of the prototype utrace-ftrace interface. This code is
based on Roland McGrath's utrace API, which provides programmatic
hooks to the in-tree tracehook layer. This new patch interfaces
many of
Acked-by: Roland McGrath [EMAIL PROTECTED]
Signed-off-by: Ingo Molnar [EMAIL PROTECTED]
---
include/asm-x86/syscall.h |3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/include/asm-x86/syscall.h b/include/asm-x86/syscall.h
index 6f29389..04c47dc 100644
--- a/include/asm-x86
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