Hello,
On Sun, 8 Jan 2017 13:22:42 +0900
Masami Hiramatsu wrote:
> > > Would you have any good benchmark to measure it?
> >
> > Not trivially so; what I did was cobble together a debugfs file that
> > measures the average of the PMI time in perf_sample_event_took(), and a
> > module that has a 1
On Wed, 4 Jan 2017 11:01:02 +0100
Peter Zijlstra wrote:
> On Wed, Jan 04, 2017 at 02:06:04PM +0900, Masami Hiramatsu wrote:
> > On Tue, 3 Jan 2017 11:54:02 +0100
> > Peter Zijlstra wrote:
>
> > > How many entries should one expect on that list? I spend quite a bit of
> > > time reducing the cos
On Tue, 3 Jan 2017 11:54:02 +0100
Peter Zijlstra wrote:
> How many entries should one expect on that list? I spend quite a bit of
> time reducing the cost of is_module_text_address() a while back and see
> that both ftrace (which actually needs this to be fast) and now
> kprobes have linear list
On Wed, Jan 04, 2017 at 02:06:04PM +0900, Masami Hiramatsu wrote:
> On Tue, 3 Jan 2017 11:54:02 +0100
> Peter Zijlstra wrote:
> > How many entries should one expect on that list? I spend quite a bit of
> > time reducing the cost of is_module_text_address() a while back and see
> > that both ftrac
On Tue, 3 Jan 2017 11:54:02 +0100
Peter Zijlstra wrote:
> On Tue, Dec 27, 2016 at 03:14:10PM +0900, Masami Hiramatsu wrote:
>
> > diff --git a/kernel/extable.c b/kernel/extable.c
> > index e820cce..81c9633 100644
> > --- a/kernel/extable.c
> > +++ b/kernel/extable.c
>
> > @@ -123,7 +126,11 @@ i
On Tue, Dec 27, 2016 at 03:14:10PM +0900, Masami Hiramatsu wrote:
> diff --git a/kernel/extable.c b/kernel/extable.c
> index e820cce..81c9633 100644
> --- a/kernel/extable.c
> +++ b/kernel/extable.c
> @@ -123,7 +126,11 @@ int kernel_text_address(unsigned long addr)
> return 1;
>
Make __kernel_text_address()/kernel_text_address() returns
true if the given address is on a kprobe's instruction slot,
which is generated by kprobes as a trampoline code.
This can help stacktraces to determine the address is on a
text area or not.
To implement this without any sleep in is_kprobe_
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