All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tom Zanussi <tom.zanussi@linux.intel.com>
To: rostedt@goodmis.org
Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org,
	vedang.patel@intel.com, bigeasy@linutronix.de,
	joel.opensrc@gmail.com, joelaf@google.com,
	mathieu.desnoyers@efficios.com, baohong.liu@intel.com,
	rajvi.jingar@intel.com, julia@ni.com, fengguang.wu@intel.com,
	linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
	Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH v6 35/37] tracing: Increase trace_recursive_lock() limit for synthetic events
Date: Fri, 17 Nov 2017 14:33:14 -0600	[thread overview]
Message-ID: <b1f42c5434a321884027364b0c23bfca3b861c14.1510948725.git.tom.zanussi@linux.intel.com> (raw)
In-Reply-To: <cover.1510948725.git.tom.zanussi@linux.intel.com>
In-Reply-To: <cover.1510948725.git.tom.zanussi@linux.intel.com>

Synthetic event generation needs to happen while the current event is
still in progress, so add 1 to the trace_recursive_lock() recursion
limit to account for that.

Because we also want to allow for the possibility of a synthetic event
being generated from another synthetic event, add an additional
increment for that as well.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
---
 kernel/trace/ring_buffer.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 763b3fb..8c862ea 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2589,16 +2589,16 @@ static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
  *  IRQ context
  *  NMI context
  *
- * If for some reason the ring buffer starts to recurse, we
- * only allow that to happen at most 4 times (one for each
- * context). If it happens 5 times, then we consider this a
- * recusive loop and do not let it go further.
+ * If for some reason the ring buffer starts to recurse, we only allow
+ * that to happen at most 6 times (one for each context, plus possibly
+ * two levels of synthetic event generation). If it happens 7 times,
+ * then we consider this a recusive loop and do not let it go further.
  */
 
 static __always_inline int
 trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer)
 {
-	if (cpu_buffer->current_context >= 4)
+	if (cpu_buffer->current_context >= 6)
 		return 1;
 
 	cpu_buffer->current_context++;
-- 
1.9.3

  parent reply	other threads:[~2017-11-17 20:38 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-17 20:32 [PATCH v6 00/37] tracing: Inter-event (e.g. latency) support Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 01/37] tracing: Move hist trigger Documentation to histogram.txt Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 02/37] tracing: Add Documentation for log2 modifier Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 03/37] tracing: Add support to detect and avoid duplicates Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 04/37] tracing: Remove code which merges duplicates Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 05/37] ring-buffer: Add interface for setting absolute time stamps Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 06/37] ring-buffer: Redefine the unimplemented RINGBUF_TYPE_TIME_STAMP Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 07/37] tracing: Add timestamp_mode trace file Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 08/37] tracing: Give event triggers access to ring_buffer_event Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 09/37] tracing: Add ring buffer event param to hist field functions Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 10/37] tracing: Break out hist trigger assignment parsing Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 11/37] tracing: Add hist trigger timestamp support Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 12/37] tracing: Add per-element variable support to tracing_map Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 13/37] tracing: Add hist_data member to hist_field Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 14/37] tracing: Add usecs modifier for hist trigger timestamps Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 15/37] tracing: Add variable support to hist triggers Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 16/37] tracing: Account for variables in named trigger compatibility Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 17/37] tracing: Move get_hist_field_flags() Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 18/37] tracing: Add simple expression support to hist triggers Tom Zanussi
2017-11-20  6:05   ` Namhyung Kim
2017-11-17 20:32 ` [PATCH v6 19/37] tracing: Generalize per-element hist trigger data Tom Zanussi
2017-11-17 20:32 ` [PATCH v6 20/37] tracing: Pass tracing_map_elt to hist_field accessor functions Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 21/37] tracing: Add hist_field 'type' field Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 22/37] tracing: Add variable reference handling to hist triggers Tom Zanussi
2017-11-21 10:53   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 23/37] tracing: Add hist trigger action hook Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 24/37] tracing: Add support for 'synthetic' events Tom Zanussi
2017-11-21 11:32   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 25/37] tracing: Add support for 'field variables' Tom Zanussi
2017-11-21 12:08   ` Namhyung Kim
2017-11-22  6:05   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 26/37] tracing: Add 'onmatch' hist trigger action support Tom Zanussi
2017-11-22  9:49   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 27/37] tracing: Add 'onmax' " Tom Zanussi
2017-11-23  5:09   ` Namhyung Kim
2017-11-29 20:53     ` Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 28/37] tracing: Allow whitespace to surround hist trigger filter Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 29/37] tracing: Add cpu field for hist triggers Tom Zanussi
2017-11-23  5:25   ` Namhyung Kim
2017-11-29 21:02     ` Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 30/37] tracing: Add hist trigger support for variable reference aliases Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 31/37] tracing: Add 'last error' error facility for hist triggers Tom Zanussi
2017-11-23  6:22   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 32/37] tracing: Add inter-event hist trigger Documentation Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 33/37] tracing: Make tracing_set_clock() non-static Tom Zanussi
2017-11-17 20:33 ` [PATCH v6 34/37] tracing: Add a clock attribute for hist triggers Tom Zanussi
2017-11-17 20:33 ` Tom Zanussi [this message]
2017-11-17 20:33 ` [PATCH v6 36/37] tracing: Add inter-event blurb to HIST_TRIGGERS config option Tom Zanussi
2017-11-23  6:57   ` Namhyung Kim
2017-11-17 20:33 ` [PATCH v6 37/37] selftests: ftrace: Add inter-event hist triggers testcases Tom Zanussi

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=b1f42c5434a321884027364b0c23bfca3b861c14.1510948725.git.tom.zanussi@linux.intel.com \
    --to=tom.zanussi@linux.intel.com \
    --cc=baohong.liu@intel.com \
    --cc=bigeasy@linutronix.de \
    --cc=fengguang.wu@intel.com \
    --cc=joel.opensrc@gmail.com \
    --cc=joelaf@google.com \
    --cc=julia@ni.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rt-users@vger.kernel.org \
    --cc=mathieu.desnoyers@efficios.com \
    --cc=mhiramat@kernel.org \
    --cc=namhyung@kernel.org \
    --cc=rajvi.jingar@intel.com \
    --cc=rostedt@goodmis.org \
    --cc=tglx@linutronix.de \
    --cc=vedang.patel@intel.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.