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| author | Li Zefan <lizefan@huawei.com> | 2013-03-05 12:06:09 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-03-06 14:24:30 +0400 |
| commit | cc1f4b1f3faed9f2040eff2a75f510b424b3cf18 (patch) | |
| tree | c894d67bfca2ff5aebf09cc1f3cc8b0f8f88ddd6 /kernel/sched | |
| parent | 090b582f27ac7b6714661020033160130e5297bd (diff) | |
| download | linux-cc1f4b1f3faed9f2040eff2a75f510b424b3cf18.tar.xz | |
sched: Move SCHED_LOAD_SHIFT macros to kernel/sched/sched.h
They are used internally only.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/5135A771.4070104@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/sched.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index cc03cfdf469f..709a30cdfd85 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -33,6 +33,31 @@ extern __read_mostly int scheduler_running; */ #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) +/* + * Increase resolution of nice-level calculations for 64-bit architectures. + * The extra resolution improves shares distribution and load balancing of + * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup + * hierarchies, especially on larger systems. This is not a user-visible change + * and does not change the user-interface for setting shares/weights. + * + * We increase resolution only if we have enough bits to allow this increased + * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution + * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the + * increased costs. + */ +#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ +# define SCHED_LOAD_RESOLUTION 10 +# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) +# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) +#else +# define SCHED_LOAD_RESOLUTION 0 +# define scale_load(w) (w) +# define scale_load_down(w) (w) +#endif + +#define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) +#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) + #define NICE_0_LOAD SCHED_LOAD_SCALE #define NICE_0_SHIFT SCHED_LOAD_SHIFT @@ -784,7 +809,6 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev) } #endif /* __ARCH_WANT_UNLOCKED_CTXSW */ - static inline void update_load_add(struct load_weight *lw, unsigned long inc) { lw->weight += inc; |