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authorluca abeni <luca.abeni@santannapisa.it>2017-09-07 12:09:31 +0200
committerIngo Molnar <mingo@kernel.org>2017-10-10 11:45:26 +0200
commit799ba82de01e7543f6b2042e1a739f3a20255f23 (patch)
treeb28040f9a227eb73af78a698dda7a83defdd2068 /include/linux/sched.h
parent8c0944cee7af55291df0b28e6e2eeac0930e93c9 (diff)
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@santannapisa.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Juri Lelli <juri.lelli@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1504778971-13573-5-git-send-email-luca.abeni@santannapisa.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 33a01f4deb00..0f897dfc195e 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