60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From c54e986675b32bda66a071c2f8061c8260f5e0a5 Mon Sep 17 00:00:00 2001
|
|
Message-Id: <c54e986675b32bda66a071c2f8061c8260f5e0a5.1601675153.git.zanussi@kernel.org>
|
|
In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
|
|
References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
|
|
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Date: Fri, 21 Feb 2020 18:15:15 +0100
|
|
Subject: [PATCH 321/333] tracing: make preempt_lazy and migrate_disable
|
|
counter smaller
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
|
|
|
|
[ Upstream commit dd430bf5ecb40f9a89679c85868826475d71de54 ]
|
|
|
|
The migrate_disable counter should not exceed 255 so it is enough to
|
|
store it in an 8bit field.
|
|
With this change we can move the `preempt_lazy_count' member into the
|
|
gap so the whole struct shrinks by 4 bytes to 12 bytes in total.
|
|
Remove the `padding' field, it is not needed.
|
|
Update the tracing fields in trace_define_common_fields() (it was
|
|
missing the preempt_lazy_count field).
|
|
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
|
|
---
|
|
include/linux/trace_events.h | 3 +--
|
|
kernel/trace/trace_events.c | 4 ++--
|
|
2 files changed, 3 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
|
|
index 72864a11cec0..e26a85c1b7ba 100644
|
|
--- a/include/linux/trace_events.h
|
|
+++ b/include/linux/trace_events.h
|
|
@@ -62,8 +62,7 @@ struct trace_entry {
|
|
unsigned char flags;
|
|
unsigned char preempt_count;
|
|
int pid;
|
|
- unsigned short migrate_disable;
|
|
- unsigned short padding;
|
|
+ unsigned char migrate_disable;
|
|
unsigned char preempt_lazy_count;
|
|
};
|
|
|
|
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
|
|
index 7b59bc9077de..f1ca52d19b7a 100644
|
|
--- a/kernel/trace/trace_events.c
|
|
+++ b/kernel/trace/trace_events.c
|
|
@@ -188,8 +188,8 @@ static int trace_define_common_fields(void)
|
|
__common_field(unsigned char, flags);
|
|
__common_field(unsigned char, preempt_count);
|
|
__common_field(int, pid);
|
|
- __common_field(unsigned short, migrate_disable);
|
|
- __common_field(unsigned short, padding);
|
|
+ __common_field(unsigned char, migrate_disable);
|
|
+ __common_field(unsigned char, preempt_lazy_count);
|
|
|
|
return ret;
|
|
}
|
|
--
|
|
2.17.1
|
|
|