From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Zhengjun Xing <zhengjun.xing@linux.intel.com>,
Tom Zanussi <zanussi@kernel.org>
Subject: [for-next][PATCH 25/25] tracing: Add "gfp_t" support in synthetic_events
Date: Thu, 05 Sep 2019 11:43:23 -0400 [thread overview]
Message-ID: <20190905154344.177680295@goodmis.org> (raw)
In-Reply-To: 20190905154258.573706229@goodmis.org
From: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Add "gfp_t" support in synthetic_events, then the "gfp_t" type
parameter in some functions can be traced.
Prints the gfp flags as hex in addition to the human-readable flag
string. Example output:
whoopsie-630 [000] ...1 78.969452: testevent: bar=b20 (GFP_ATOMIC|__GFP_ZERO)
rcuc/0-11 [000] ...1 81.097555: testevent: bar=a20 (GFP_ATOMIC)
rcuc/0-11 [000] ...1 81.583123: testevent: bar=a20 (GFP_ATOMIC)
Link: http://lkml.kernel.org/r/20190712015308.9908-1-zhengjun.xing@linux.intel.com
Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>
[ Added printing of flag names ]
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_hist.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 65e7d071ed28..3a6e42aa08e6 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -13,6 +13,10 @@
#include <linux/rculist.h>
#include <linux/tracefs.h>
+/* for gfp flag names */
+#include <linux/trace_events.h>
+#include <trace/events/mmflags.h>
+
#include "tracing_map.h"
#include "trace.h"
#include "trace_dynevent.h"
@@ -752,6 +756,8 @@ 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 +798,8 @@ 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 = "%x";
else if (synth_field_is_string(type))
fmt = "%s";
@@ -834,9 +842,20 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter,
i == se->n_fields - 1 ? "" : " ");
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
} else {
+ struct trace_print_flags __flags[] = {
+ __def_gfpflag_names, {-1, NULL} };
+
trace_seq_printf(s, print_fmt, se->fields[i]->name,
entry->fields[n_u64],
i == se->n_fields - 1 ? "" : " ");
+
+ if (strcmp(se->fields[i]->type, "gfp_t") == 0) {
+ trace_seq_puts(s, " (");
+ trace_print_flags_seq(s, "|",
+ entry->fields[n_u64],
+ __flags);
+ trace_seq_putc(s, ')');
+ }
n_u64++;
}
}
--
2.20.1
prev parent reply other threads:[~2019-09-05 15:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-05 15:42 [for-next][PATCH 00/25] tracing: Updates for 5.4 Steven Rostedt
2019-09-05 15:42 ` [for-next][PATCH 01/25] kprobes: Allow kprobes coexist with livepatch Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 02/25] recordmcount: Remove redundant strcmp Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 03/25] recordmcount: Remove uread() Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 04/25] recordmcount: Remove unused fd from uwrite() and ulseek() Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 05/25] tracing/probe: Split trace_event related data from trace_probe Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 06/25] tracing/dynevent: Delete all matched events Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 07/25] tracing/dynevent: Pass extra arguments to match operation Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 08/25] tracing/kprobe: Add multi-probe per event support Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 09/25] tracing/uprobe: Add multi-probe per uprobe " Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 10/25] tracing/kprobe: Add per-probe delete from event Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 11/25] tracing/uprobe: " Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 12/25] tracing/probe: Add immediate parameter support Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 13/25] tracing/probe: Add immediate string " Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 14/25] selftests/ftrace: Add a testcase for kprobe multiprobe event Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 15/25] selftests/ftrace: Add syntax error test for immediates Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 16/25] selftests/ftrace: Add syntax error test for multiprobe Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 17/25] recordmcount: Rewrite error/success handling Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 18/25] recordmcount: Kernel style function signature formatting Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 19/25] recordmcount: Kernel style formatting Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 20/25] recordmcount: Remove redundant cleanup() calls Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 21/25] recordmcount: Clarify what cleanup() does Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 22/25] tracing/arm64: Have max stack tracer handle the case of return address after data Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 23/25] tracing: Document the stack trace algorithm in the comments Steven Rostedt
2019-09-05 15:43 ` [for-next][PATCH 24/25] tracing: Rename tracing_reset() to tracing_reset_cpu() Steven Rostedt
2019-09-05 15:43 ` Steven Rostedt [this message]
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