Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page reference manipulation

From	Joonsoo Kim <iamjoonsoo.kim@lge.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page reference manipulation
Date	2015-12-10 05:30 +0100
Message-ID	<qE11D-17Q-7@gated-at.bofh.it> (permalink)
References	(5 earlier) <qybn5-1PG-9@gated-at.bofh.it> <qBtx7-8sd-7@gated-at.bofh.it> <qDTdN-4yA-33@gated-at.bofh.it> <qDZCx-8tE-5@gated-at.bofh.it> <qE0ff-AZ-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, Dec 09, 2015 at 10:36:48PM -0500, Steven Rostedt wrote:
> On Thu, 10 Dec 2015 11:50:15 +0900
> Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
> 
> > Output of cpu 3, 7 are mixed and it's not easy to analyze it.
> > 
> > I think that it'd be better not to sort stack trace. How do
> > you think about it? Could you fix it, please?
> 
> It may not be that easy to fix because of the sorting algorithm. That
> would require looking going ahead one more event each time and then
> checking if its a stacktrace. I may look at it and see if I can come up
> with something that's not too invasive in the algorithms.

Okay.

> That said, for now you can use the --cpu option. I'm not sure I ever
> documented it as it was originally added for debugging, but I use it
> enough that it may be worth while to officially support it.
> 
>  trace-cmd report --cpu 3
> 
> Will show you just cpu 3 and nothing else. Which is what I use a lot.

Thanks for the input. It works but it's not sufficient to me.
Page reference is manipulated by multiple cpus so it's better to
analyze unified output.

> 
> But doing the stack trace thing may be something to fix as well. I'll
> see what I can do, but no guarantees.

Okay. Don't be hurry. :)
trace-cmd is excellent and works well for me as it is.

Thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page  reference manipulation Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-12-03 05:20 +0100
  Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page  reference manipulation Steven Rostedt <rostedt@goodmis.org> - 2015-12-09 21:10 +0100
    Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page  reference manipulation Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-12-10 04:00 +0100
      Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page  reference manipulation Steven Rostedt <rostedt@goodmis.org> - 2015-12-10 04:40 +0100
        Re: [PATCH 2/2] mm/page_ref: add tracepoint to track down page  reference manipulation Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2015-12-10 05:30 +0100

csiph-web