From: Jiri Olsa <jolsa@redhat.com>
To: Martin Ichilevici de Oliveira <martin.i.oliveira@gmail.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>,
linux-perf-users@vger.kernel.org
Subject: Re: Interrupt caused by software events
Date: Sat, 12 Jul 2014 23:15:12 +0200 [thread overview]
Message-ID: <20140712211512.GA29028@krava.redhat.com> (raw)
In-Reply-To: <20140711142058.GA27580@gamayun>
On Fri, Jul 11, 2014 at 11:20:58AM -0300, Martin Ichilevici de Oliveira wrote:
> On Wed, Jul 09, 2014 at 10:05:55AM -0400, Vince Weaver wrote:
> > Not really sure by what you mean by "real-time", but you can theoretically
> > set up the perf_event mmap buffer with a low threshold, and have it
> > configured to send a signal to your program whenever an event comes in.
> > In theory you can get the PEBS-like info out that way. It's going to have
> > fairly high overhead though, especially if you set the sample rate high.
SNIP
>
> Jiri:
> I'm under the impression I'd have to be in a kernel module (or in kernel
> mode in general) to use perf_event_create_kernel_counter(). Is that
> correct?
yep, thats kernel space only
jirka
next prev parent reply other threads:[~2014-07-12 21:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-08 14:42 Interrupt caused by software events Martin Ichilevici de Oliveira
2014-07-09 13:54 ` Jiri Olsa
2014-07-09 14:05 ` Vince Weaver
2014-07-11 14:20 ` Martin Ichilevici de Oliveira
2014-07-11 15:26 ` Vince Weaver
2014-07-12 21:15 ` Jiri Olsa [this message]
2014-07-13 3:34 ` Andi Kleen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140712211512.GA29028@krava.redhat.com \
--to=jolsa@redhat.com \
--cc=linux-perf-users@vger.kernel.org \
--cc=martin.i.oliveira@gmail.com \
--cc=vincent.weaver@maine.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).