On Thu, Nov 08, 2007 at 02:42:33PM -0500, Avishay Traeger wrote:
> Sorry for reviving a thread from two months ago... :)
>
> On Wed, 2007-09-26 at 10:09 +0530, Ananth N Mavinakayanahalli wrote:
> > On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> > > Hello,
> > > I am trying to
On Thu, Nov 08, 2007 at 02:42:33PM -0500, Avishay Traeger wrote:
Sorry for reviving a thread from two months ago... :)
On Wed, 2007-09-26 at 10:09 +0530, Ananth N Mavinakayanahalli wrote:
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes
Sorry for reviving a thread from two months ago... :)
On Wed, 2007-09-26 at 10:09 +0530, Ananth N Mavinakayanahalli wrote:
> On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> > Hello,
> > I am trying to use kprobes to measure the latency of a function by
> > instrumenting its
Sorry for reviving a thread from two months ago... :)
On Wed, 2007-09-26 at 10:09 +0530, Ananth N Mavinakayanahalli wrote:
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site.
On Wed, 2007-09-26 at 10:28 -0700, Keshavamurthy, Anil S wrote:
> On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
> > On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> > > Hello,
> > > I am trying to use kprobes to measure the latency of a function by
>
On Wed, 2007-09-26 at 22:57 +0530, Ananth N Mavinakayanahalli wrote:
> On Wed, Sep 26, 2007 at 12:09:35PM -0400, Avishay Traeger wrote:
> > On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
> > > What happens when the "call" is singlestepped is that the instruction
> > > pointer
On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
> On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> > Hello,
> > I am trying to use kprobes to measure the latency of a function by
> > instrumenting its call site. Basically, I find the call instruction,
On Wed, Sep 26, 2007 at 12:09:35PM -0400, Avishay Traeger wrote:
> On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
> > What happens when the "call" is singlestepped is that the instruction
> > pointer is moved to the call target. That explains the lower latency you
> > are
On 9/26/07, Ananth N Mavinakayanahalli <[EMAIL PROTECTED]> wrote:
> PS: There was a thought of providing a facility to run a handler at
> function entry even when just a kretprobe is used. Maybe we need to
> relook at that; it'd have been useful in this case.
That would be really useful. I was
On 9/26/07, Avishay Traeger <[EMAIL PROTECTED]> wrote:
> So to measure the latency of foo(), I basically want kprobes to do this:
> pre_handler();
> foo();
> post_handler();
>
> The problem is that the latencies that I am getting are consistently low
> (~10,000 cycles). When I manually instrument
On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
> What happens when the "call" is singlestepped is that the instruction
> pointer is moved to the call target. That explains the lower latency you
> are seeing. You'll need to do something along the lines I suggested in
> the
On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
> On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> > Hello,
> > I am trying to use kprobes to measure the latency of a function by
> > instrumenting its call site. Basically, I find the call instruction,
On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site. Basically, I find the call instruction,
and
On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
What happens when the call is singlestepped is that the instruction
pointer is moved to the call target. That explains the lower latency you
are seeing. You'll need to do something along the lines I suggested in
the earlier
On 9/26/07, Avishay Traeger [EMAIL PROTECTED] wrote:
So to measure the latency of foo(), I basically want kprobes to do this:
pre_handler();
foo();
post_handler();
The problem is that the latencies that I am getting are consistently low
(~10,000 cycles). When I manually instrument the
On 9/26/07, Ananth N Mavinakayanahalli [EMAIL PROTECTED] wrote:
PS: There was a thought of providing a facility to run a handler at
function entry even when just a kretprobe is used. Maybe we need to
relook at that; it'd have been useful in this case.
That would be really useful. I was
On Wed, Sep 26, 2007 at 12:09:35PM -0400, Avishay Traeger wrote:
On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
What happens when the call is singlestepped is that the instruction
pointer is moved to the call target. That explains the lower latency you
are seeing.
On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site. Basically, I find the call instruction,
and
On Wed, 2007-09-26 at 22:57 +0530, Ananth N Mavinakayanahalli wrote:
On Wed, Sep 26, 2007 at 12:09:35PM -0400, Avishay Traeger wrote:
On Wed, 2007-09-26 at 14:33 +0530, Ananth N Mavinakayanahalli wrote:
What happens when the call is singlestepped is that the instruction
pointer is moved
On Wed, 2007-09-26 at 10:28 -0700, Keshavamurthy, Anil S wrote:
On Wed, Sep 26, 2007 at 10:09:33AM +0530, Ananth N Mavinakayanahalli wrote:
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes to measure the latency of a function by
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
> Hello,
> I am trying to use kprobes to measure the latency of a function by
> instrumenting its call site. Basically, I find the call instruction,
> and insert a kprobe with a pre-handler and post-handler at that point.
> The
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site. Basically, I find the call instruction,
and insert a kprobe with a pre-handler and post-handler at that point.
The pre-handler measures the latency (reads the TSC counter). The
post-handler
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site. Basically, I find the call instruction,
and insert a kprobe with a pre-handler and post-handler at that point.
The pre-handler measures the latency (reads the TSC counter). The
post-handler
On Tue, Sep 25, 2007 at 06:12:38PM -0400, Avishay Traeger wrote:
Hello,
I am trying to use kprobes to measure the latency of a function by
instrumenting its call site. Basically, I find the call instruction,
and insert a kprobe with a pre-handler and post-handler at that point.
The
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