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Message-ID: <20220315190242.813090716@goodmis.org>
Date: Tue, 15 Mar 2022 15:02:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Daniel Bristot de Oliveira <bristot@...nel.org>,
Clark Williams <williams@...hat.com>,
Juri Lelli <juri.lelli@...hat.com>,
Jonathan Corbet <corbet@....net>
Subject: [for-next][PATCH 01/15] rtla/osnoise: Add support to adjust the tracing_thresh
From: Daniel Bristot de Oliveira <bristot@...nel.org>
osnoise uses the tracing_thresh parameter to define the delta between
two reads of the time to be considered a noise.
Add support to get and set the tracing_thresh from osnoise tools.
Link: https://lkml.kernel.org/r/715ad2a53fd40e41bab8c3f1214c1a94e12fb595.1646247211.git.bristot@kernel.org
Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Clark Williams <williams@...hat.com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
tools/tracing/rtla/src/osnoise.c | 83 ++++++++++++++++++++++++++++++++
tools/tracing/rtla/src/osnoise.h | 8 +++
2 files changed, 91 insertions(+)
diff --git a/tools/tracing/rtla/src/osnoise.c b/tools/tracing/rtla/src/osnoise.c
index e60f1862bad0..b8ec6c15bccb 100644
--- a/tools/tracing/rtla/src/osnoise.c
+++ b/tools/tracing/rtla/src/osnoise.c
@@ -655,6 +655,85 @@ void osnoise_put_print_stack(struct osnoise_context *context)
context->orig_print_stack = OSNOISE_OPTION_INIT_VAL;
}
+/*
+ * osnoise_get_tracing_thresh - read and save the original "tracing_thresh"
+ */
+static long long
+osnoise_get_tracing_thresh(struct osnoise_context *context)
+{
+ long long tracing_thresh;
+
+ if (context->tracing_thresh != OSNOISE_OPTION_INIT_VAL)
+ return context->tracing_thresh;
+
+ if (context->orig_tracing_thresh != OSNOISE_OPTION_INIT_VAL)
+ return context->orig_tracing_thresh;
+
+ tracing_thresh = osnoise_read_ll_config("tracing_thresh");
+ if (tracing_thresh < 0)
+ goto out_err;
+
+ context->orig_tracing_thresh = tracing_thresh;
+ return tracing_thresh;
+
+out_err:
+ return OSNOISE_OPTION_INIT_VAL;
+}
+
+/*
+ * osnoise_set_tracing_thresh - set "tracing_thresh"
+ */
+int osnoise_set_tracing_thresh(struct osnoise_context *context, long long tracing_thresh)
+{
+ long long curr_tracing_thresh = osnoise_get_tracing_thresh(context);
+ int retval;
+
+ if (curr_tracing_thresh == OSNOISE_OPTION_INIT_VAL)
+ return -1;
+
+ retval = osnoise_write_ll_config("tracing_thresh", tracing_thresh);
+ if (retval < 0)
+ return -1;
+
+ context->tracing_thresh = tracing_thresh;
+
+ return 0;
+}
+
+/*
+ * osnoise_restore_tracing_thresh - restore the original "tracing_thresh"
+ */
+void osnoise_restore_tracing_thresh(struct osnoise_context *context)
+{
+ int retval;
+
+ if (context->orig_tracing_thresh == OSNOISE_OPTION_INIT_VAL)
+ return;
+
+ if (context->orig_tracing_thresh == context->tracing_thresh)
+ goto out_done;
+
+ retval = osnoise_write_ll_config("tracing_thresh", context->orig_tracing_thresh);
+ if (retval < 0)
+ err_msg("Could not restore original tracing_thresh\n");
+
+out_done:
+ context->tracing_thresh = OSNOISE_OPTION_INIT_VAL;
+}
+
+/*
+ * osnoise_put_tracing_thresh - restore original values and cleanup data
+ */
+void osnoise_put_tracing_thresh(struct osnoise_context *context)
+{
+ osnoise_restore_tracing_thresh(context);
+
+ if (context->orig_tracing_thresh == OSNOISE_OPTION_INIT_VAL)
+ return;
+
+ context->orig_tracing_thresh = OSNOISE_OPTION_INIT_VAL;
+}
+
/*
* enable_osnoise - enable osnoise tracer in the trace_instance
*/
@@ -716,6 +795,9 @@ struct osnoise_context *osnoise_context_alloc(void)
context->orig_print_stack = OSNOISE_OPTION_INIT_VAL;
context->print_stack = OSNOISE_OPTION_INIT_VAL;
+ context->orig_tracing_thresh = OSNOISE_OPTION_INIT_VAL;
+ context->tracing_thresh = OSNOISE_OPTION_INIT_VAL;
+
osnoise_get_context(context);
return context;
@@ -741,6 +823,7 @@ void osnoise_put_context(struct osnoise_context *context)
osnoise_put_stop_total_us(context);
osnoise_put_timerlat_period_us(context);
osnoise_put_print_stack(context);
+ osnoise_put_tracing_thresh(context);
free(context);
}
diff --git a/tools/tracing/rtla/src/osnoise.h b/tools/tracing/rtla/src/osnoise.h
index 9e4b2e2a4559..04a4384cc544 100644
--- a/tools/tracing/rtla/src/osnoise.h
+++ b/tools/tracing/rtla/src/osnoise.h
@@ -23,6 +23,10 @@ struct osnoise_context {
long long orig_timerlat_period_us;
long long timerlat_period_us;
+ /* 0 as init value */
+ long long orig_tracing_thresh;
+ long long tracing_thresh;
+
/* -1 as init value because 0 is disabled */
long long orig_stop_us;
long long stop_us;
@@ -67,6 +71,10 @@ int osnoise_set_timerlat_period_us(struct osnoise_context *context,
long long timerlat_period_us);
void osnoise_restore_timerlat_period_us(struct osnoise_context *context);
+int osnoise_set_tracing_thresh(struct osnoise_context *context,
+ long long tracing_thresh);
+void osnoise_restore_tracing_thresh(struct osnoise_context *context);
+
void osnoise_restore_print_stack(struct osnoise_context *context);
int osnoise_set_print_stack(struct osnoise_context *context,
long long print_stack);
--
2.35.1
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