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From: Tom Zanussi <tom.zanussi@linux.intel.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: rostedt@goodmis.org, daniel.wagner@bmw-carit.de,
	masami.hiramatsu.pt@hitachi.com, josh@joshtriplett.org,
	andi@firstfloor.org, mathieu.desnoyers@efficios.com,
	peterz@infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v11 22/28] tracing: Add enable_hist/disable_hist triggers
Date: Tue, 03 Nov 2015 19:58:26 -0600	[thread overview]
Message-ID: <1446602306.17120.172.camel@tzanussi-mobl.amr.corp.intel.com> (raw)
In-Reply-To: <20151103085555.GC20951@danjae.kornet>

On Tue, 2015-11-03 at 17:55 +0900, Namhyung Kim wrote:
> On Thu, Oct 22, 2015 at 01:14:26PM -0500, Tom Zanussi wrote:
> > Similar to enable_event/disable_event triggers, these triggers enable
> > and disable the aggregation of events into maps rather than enabling
> > and disabling their writing into the trace buffer.
> > 
> > They can be used to automatically start and stop hist triggers based
> > on a matching filter condition.
> > 
> > If there's a paused hist trigger on system:event, the following would
> > start it when the filter condition was hit:
> > 
> >   # echo enable_hist:system:event [ if filter] > event/trigger
> > 
> > And the following would disable a running system:event hist trigger:
> > 
> >   # echo disable_hist:system:event [ if filter] > event/trigger
> 
> What about named hist triggers?  Maybe worth adding
> "enable/disable_hist_name" too?
> 

enable_disable_hist should work fine with both named and unnamed hist
triggers.  As an example, the below sets a couple each of both named and
unnamed triggers and enables and disables them using
enable/disable_hist.  Running this I got the expected output i.e. there
were events captured in both named and unnamed histograms:

echo 'hist:name=foo:keys=skbaddr.hex:vals=len:pause if len < 0' > /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
echo 'hist:name=foo:keys=skbaddr.hex:vals=len:pause if len > 256' > /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
echo 'hist:keys=skbaddr.hex:vals=len:pause if len == 256' > /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
echo 'hist:keys=skbaddr.hex:vals=len:pause' > /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger

echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger
echo 'disable_hist:net:netif_receive_skb if comm==wget' > /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger

Thanks,

Tom

> Thanks,
> Namhyung
> 
> 
> > 
> > See Documentation/trace/events.txt for real examples.
> > 
> > Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
> > Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>



  reply	other threads:[~2015-11-04  1:58 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-22 18:14 [PATCH 00/28] tracing: 'hist' triggers Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 01/28] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 02/28] tracing: Make ftrace_event_field checking functions available Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 03/28] tracing: Make event trigger " Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 04/28] tracing: Add event record param to trigger_ops.func() Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 05/28] tracing: Add get_syscall_name() Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 06/28] tracing: Add a per-event-trigger 'paused' field Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 07/28] tracing: Add needs_rec flag to event triggers Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 08/28] tracing: Add lock-free tracing_map Tom Zanussi
2015-10-29  8:31   ` Namhyung Kim
2015-10-29 18:35     ` Tom Zanussi
2015-11-02  7:08       ` Namhyung Kim
2015-11-04  1:47         ` Tom Zanussi
2015-11-04  2:26           ` Namhyung Kim
2015-11-04  2:56             ` Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 09/28] tracing: Add 'hist' event trigger command Tom Zanussi
2015-10-29  9:11   ` Namhyung Kim
2015-10-29 18:37     ` Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 10/28] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi
2015-11-02  7:42   ` Namhyung Kim
2015-10-22 18:14 ` [PATCH v11 11/28] tracing: Add hist trigger support for compound keys Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 12/28] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi
2015-11-02  8:03   ` Namhyung Kim
2015-10-22 18:14 ` [PATCH v11 13/28] tracing: Add hist trigger support for pausing and continuing a trace Tom Zanussi
2015-11-03  8:38   ` Namhyung Kim
2015-11-04  1:53     ` Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 14/28] tracing: Add hist trigger support for clearing " Tom Zanussi
2015-11-03  8:43   ` Namhyung Kim
2015-10-22 18:14 ` [PATCH v11 15/28] tracing: Add hist trigger 'hex' modifier for displaying numeric fields Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 16/28] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 17/28] tracing: Add hist trigger 'execname' modifier Tom Zanussi
2015-11-02 14:10   ` Namhyung Kim
2015-11-04  2:37     ` Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 18/28] tracing: Add hist trigger 'syscall' modifier Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 19/28] tracing: Add hist trigger support for stacktraces as keys Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 20/28] tracing: Support string type key properly Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 21/28] tracing: Remove restriction on string position in hist trigger keys Tom Zanussi
2015-11-02 14:40   ` Namhyung Kim
2015-10-22 18:14 ` [PATCH v11 22/28] tracing: Add enable_hist/disable_hist triggers Tom Zanussi
2015-11-03  8:55   ` Namhyung Kim
2015-11-04  1:58     ` Tom Zanussi [this message]
2015-10-22 18:14 ` [PATCH v11 23/28] tracing: Add 'hist' trigger Documentation Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 24/28] tracing: Add support for multiple hist triggers per event Tom Zanussi
2015-11-03  0:34   ` Namhyung Kim
2015-11-04  1:52     ` Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 25/28] tracing: Add support for named triggers Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 26/28] tracing: Add support for named hist triggers Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 27/28] kselftests/ftrace : Add event trigger testcases Tom Zanussi
2015-10-22 18:14 ` [PATCH v11 28/28] kselftests/ftrace: Add hist " Tom Zanussi
2015-10-22 18:21 ` [PATCH 00/28] tracing: 'hist' triggers Steven Rostedt
2015-10-22 18:31   ` Tom Zanussi
2015-11-05 14:43 ` Namhyung Kim
2015-11-05 14:59   ` 平松雅巳 / HIRAMATU，MASAMI
2015-11-05 22:13   ` Tom Zanussi
2015-11-05 23:18     ` Namhyung Kim

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