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tracing: make preempt_lazy and migrate_disable counter smaller 

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>
This commit is contained in:
Sebastian Andrzej Siewior 2020-02-21 18:15:15 +01:00 committed by Alibek Omarov
parent e56519fc8a
commit 3af424b7f4
2 changed files with 3 additions and 4 deletions
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3
include/linux/trace_events.h
View File

@ -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;
};

4
kernel/trace/trace_events.c
View File

@ -181,8 +181,8 @@ 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;
}