60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From 72f14300c084d95060cc958277f83f2f15f88de3 Mon Sep 17 00:00:00 2001
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Message-Id: <72f14300c084d95060cc958277f83f2f15f88de3.1596234184.git.zanussi@kernel.org>
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In-Reply-To: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
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References: <378ee68279f6a7631221f2670a9298620148690d.1596234183.git.zanussi@kernel.org>
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Fri, 21 Feb 2020 18:15:15 +0100
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Subject: [PATCH 321/329] tracing: make preempt_lazy and migrate_disable
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counter smaller
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.135-rt60.tar.xz
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[ Upstream commit dd430bf5ecb40f9a89679c85868826475d71de54 ]
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The migrate_disable counter should not exceed 255 so it is enough to
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store it in an 8bit field.
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With this change we can move the `preempt_lazy_count' member into the
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gap so the whole struct shrinks by 4 bytes to 12 bytes in total.
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Remove the `padding' field, it is not needed.
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Update the tracing fields in trace_define_common_fields() (it was
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missing the preempt_lazy_count field).
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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---
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include/linux/trace_events.h | 3 +--
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kernel/trace/trace_events.c | 4 ++--
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2 files changed, 3 insertions(+), 4 deletions(-)
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diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
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index 72864a11cec0..e26a85c1b7ba 100644
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--- a/include/linux/trace_events.h
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+++ b/include/linux/trace_events.h
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@@ -62,8 +62,7 @@ struct trace_entry {
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unsigned char flags;
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unsigned char preempt_count;
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int pid;
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- unsigned short migrate_disable;
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- unsigned short padding;
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+ unsigned char migrate_disable;
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unsigned char preempt_lazy_count;
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};
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diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
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index 1febb0ca4c81..07b8f5bfd263 100644
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--- a/kernel/trace/trace_events.c
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+++ b/kernel/trace/trace_events.c
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@@ -188,8 +188,8 @@ static int trace_define_common_fields(void)
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__common_field(unsigned char, flags);
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__common_field(unsigned char, preempt_count);
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__common_field(int, pid);
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- __common_field(unsigned short, migrate_disable);
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- __common_field(unsigned short, padding);
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+ __common_field(unsigned char, migrate_disable);
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+ __common_field(unsigned char, preempt_lazy_count);
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return ret;
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}
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--
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2.17.1
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