linux-kernel - [PATCH] trace:add "gfp_t" support in synthetic

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Message-Id: <20190704025506.30199-1-zhengjun.xing@linux.intel.com>
Date:   Thu,  4 Jul 2019 10:55:06 +0800
From:   Zhengjun Xing <zhengjun.xing@...ux.intel.com>
To:     rostedt@...dmis.org, mingo@...hat.com, tom.zanussi@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, zhengjun.xing@...ux.intel.com
Subject: [PATCH] trace:add "gfp_t" support in synthetic_events

Add "gfp_t" support in synthetic_events, then the "gfp_t" type
parameter in some functions can be traced.

Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
---
 kernel/trace/trace_events_hist.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index ca6b0dff60c5..0d3ab01b7cb5 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -752,6 +752,8 @@ static int synth_field_size(char *type)
 		size = sizeof(unsigned long);
 	else if (strcmp(type, "pid_t") == 0)
 		size = sizeof(pid_t);
+	else if (strcmp(type, "gfp_t") == 0)
+		size = sizeof(gfp_t);
 	else if (synth_field_is_string(type))
 		size = synth_field_string_size(type);
 
@@ -792,6 +794,8 @@ static const char *synth_field_fmt(char *type)
 		fmt = "%lu";
 	else if (strcmp(type, "pid_t") == 0)
 		fmt = "%d";
+	else if (strcmp(type, "gfp_t") == 0)
+		fmt = "%u";
 	else if (synth_field_is_string(type))
 		fmt = "%s";
 
-- 
2.14.1