diff options
Diffstat (limited to 'debian/patches-rt/0321-tracing-make-preempt_lazy-and-migrate_disable-counte.patch')
| -rw-r--r-- | debian/patches-rt/0321-tracing-make-preempt_lazy-and-migrate_disable-counte.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/debian/patches-rt/0321-tracing-make-preempt_lazy-and-migrate_disable-counte.patch b/debian/patches-rt/0321-tracing-make-preempt_lazy-and-migrate_disable-counte.patch new file mode 100644 index 000000000..937b26b3c --- /dev/null +++ b/debian/patches-rt/0321-tracing-make-preempt_lazy-and-migrate_disable-counte.patch @@ -0,0 +1,56 @@ +From 8f58969bec3bc125c8257b4aea667ebb352cc73a Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Fri, 21 Feb 2020 18:15:15 +0100 +Subject: [PATCH 321/347] tracing: make preempt_lazy and migrate_disable + counter smaller +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.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 fbb04cf1d5bc..9b1b1c6de2bd 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; + } +-- +2.36.1 + |