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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-12-28 23:30:36 +0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-03-26 19:04:51 +0400 |
| commit | c0f4dfd4f90f1667d234d21f15153ea09a2eaa66 (patch) | |
| tree | e06fa6eef015a373849855249752ec525ca8ad4b /include/linux/rcupdate.h | |
| parent | b11cc5760a9c48c870ad286e8a6d8fdb998fa58d (diff) | |
| download | linux-c0f4dfd4f90f1667d234d21f15153ea09a2eaa66.tar.xz | |
rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks
Because RCU callbacks are now associated with the number of the grace
period that they must wait for, CPUs can now take advance callbacks
corresponding to grace periods that ended while a given CPU was in
dyntick-idle mode. This eliminates the need to try forcing the RCU
state machine while entering idle, thus reducing the CPU intensiveness
of RCU_FAST_NO_HZ, which should increase its energy efficiency.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index b758ce17b309..9ed2c9a4de45 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -80,6 +80,7 @@ extern void do_trace_rcu_torture_read(char *rcutorturename, #define UINT_CMP_LT(a, b) (UINT_MAX / 2 < (a) - (b)) #define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) #define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b)) +#define ulong2long(a) (*(long *)(&(a))) /* Exported common interfaces */ |