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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-05-05 23:56:17 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-05-05 23:56:17 +0200 |
| commit | e05510d01ad1565e5e086a939261084d67ba2b10 (patch) | |
| tree | f6a8d27f2ad546c98079c8868d914de46a77994f /kernel | |
| parent | a992241de614dd2b7c97a9ba64e28c0e563f19bf (diff) | |
| download | lwn-e05510d01ad1565e5e086a939261084d67ba2b10.tar.gz lwn-e05510d01ad1565e5e086a939261084d67ba2b10.zip | |
sched: optimize calc_delta_mine()
Joel noticed that the !lw->inv_weight contition isn't unlikely anymore so
remove the unlikely annotation. Also, remove the two div64_u64() inv_weight
calculations, which makes them rely on the calc_delta_mine() path as well.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Joel Schopp <jschopp@austin.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 34bcc5bc120e..00c1ba706a5a 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1438,8 +1438,8 @@ calc_delta_mine(unsigned long delta_exec, unsigned long weight, { u64 tmp; - if (unlikely(!lw->inv_weight)) - lw->inv_weight = (WMULT_CONST-lw->weight/2) / (lw->weight+1); + if (!lw->inv_weight) + lw->inv_weight = 1 + (WMULT_CONST-lw->weight/2)/(lw->weight+1); tmp = (u64)delta_exec * weight; /* @@ -8025,7 +8025,7 @@ static void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq, se->my_q = cfs_rq; se->load.weight = tg->shares; - se->load.inv_weight = div64_u64(1ULL<<32, se->load.weight); + se->load.inv_weight = 0; se->parent = parent; } #endif @@ -8692,7 +8692,7 @@ static void __set_se_shares(struct sched_entity *se, unsigned long shares) dequeue_entity(cfs_rq, se, 0); se->load.weight = shares; - se->load.inv_weight = div64_u64((1ULL<<32), shares); + se->load.inv_weight = 0; if (on_rq) enqueue_entity(cfs_rq, se, 0); |