All of lore.kernel.org
 help / color / mirror / Atom feed
From: Karim Yaghmour <karim.yaghmour@opersys.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: lttng-dev@lists.lttng.org
Subject: Re: [RFC PATCH lttng-modules] LTTng logger ABI
Date: Mon, 17 Feb 2014 10:09:37 -0500	[thread overview]
Message-ID: <53022631.90209__30644.3808753558$1392649852$gmane$org@opersys.com> (raw)
In-Reply-To: <1392502096-1900-1-git-send-email-mathieu.desnoyers@efficios.com>


That was quick :)

On 14-02-15 05:08 PM, Mathieu Desnoyers wrote:
> Add a user-space ABI (new file /proc/lttng-logger) to lttng-modules
> which can be written into by any user on the system. The content is
> saved into the kernel trace stream into the "lttng_logger" kernel event.

Nice. I think this would do for the use-case we discussed (i.e. feedback
Android's "ATRACE" events into lttng instead of ftrace's "trace_marker"
file.)

> The content of a single write is written into an lttng_logger event,
> provided the packet size is large enough to store the content. If it is
> not large enough, it won't be logged. However we cannot return any error
> to the caller, since there may be more than one trace session listening
> to this event.

Can we just truncate instead of dropping if the event is too large?

-- 
Karim Yaghmour
CEO - Opersys inc. / www.opersys.com
http://twitter.com/karimyaghmour

       reply	other threads:[~2014-02-17 15:09 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1392502096-1900-1-git-send-email-mathieu.desnoyers@efficios.com>
2014-02-17 15:09 ` Karim Yaghmour [this message]
     [not found] ` <53022631.90209@opersys.com>
2014-02-17 16:08   ` [RFC PATCH lttng-modules] LTTng logger ABI Mathieu Desnoyers
     [not found]   ` <1718413437.26031.1392653324422.JavaMail.zimbra@efficios.com>
2014-02-17 16:13     ` Karim Yaghmour
     [not found]     ` <53023536.9050007@opersys.com>
2014-02-17 16:21       ` Mathieu Desnoyers
     [not found]       ` <1098265448.26099.1392654107038.JavaMail.zimbra@efficios.com>
2014-02-17 16:26         ` Karim Yaghmour
     [not found]         ` <53023832.6010005@opersys.com>
2014-02-17 16:40           ` Mathieu Desnoyers
     [not found]           ` <1299774859.26113.1392655235092.JavaMail.zimbra@efficios.com>
2014-02-17 16:41             ` Karim Yaghmour
2014-02-15 22:08 Mathieu Desnoyers

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='53022631.90209__30644.3808753558$1392649852$gmane$org@opersys.com' \
    --to=karim.yaghmour@opersys.com \
    --cc=lttng-dev@lists.lttng.org \
    --cc=mathieu.desnoyers@efficios.com \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.