Commit-ID: 799ba82de01e7543f6b2042e1a739f3a20255f23
Gitweb: https://git.kernel.org/tip/799ba82de01e7543f6b2042e1a739f3a20255f23
Author: luca abeni <luca.abeni@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 7 Sep 2017 12:09:31 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 10 Oct 2017 11:45:26 +0200
sched/deadline: Use C bitfields for the state flags
Ask the compiler to use a single bit for storing true / false values,
instead of wasting the size of a whole int value.
Tested with gcc 5.4.0 on x86_64, and the compiler produces the expected
Assembly (similar to the Assembly code generated when explicitly accessing
the bits with bitmasks, "&" and "|").
Signed-off-by: luca abeni <luca.abeni@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1504778971-13573-5-git-send-email-luca.abeni@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/sched.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 33a01f4..0f897df 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -474,10 +474,10 @@ struct sched_dl_entity {
* conditions between the inactive timer handler and the wakeup
* code.
*/
- int dl_throttled;
- int dl_boosted;
- int dl_yielded;
- int dl_non_contending;
+ int dl_throttled : 1;
+ int dl_boosted : 1;
+ int dl_yielded : 1;
+ int dl_non_contending : 1;
/*
* Bandwidth enforcement timer. Each -deadline task has its
--
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