diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-10-04 02:17:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-04 07:55:31 -0700 |
| commit | 20e9751bd9dd6b832fd84ada27840360f7e877f1 (patch) | |
| tree | c598ff9cb9e540da7f8595f2c130f3674065e018 /mm/allocpercpu.c | |
| parent | 4b6c2cca6eef9cc4a15350bf1c61839e12e08b84 (diff) | |
[PATCH] rcu: simplify/improve batch tuning
Kill a hard-to-calculate 'rsinterval' boot parameter and per-cpu
rcu_data.last_rs_qlen. Instead, it adds adds a flag rcu_ctrlblk.signaled,
which records the fact that one of CPUs has sent a resched IPI since the
last rcu_start_batch().
Roughly speaking, we need two rcu_start_batch()s in order to move callbacks
from ->nxtlist to ->donelist. This means that when ->qlen exceeds qhimark
and continues to grow, we should send a resched IPI, and then do it again
after we gone through a quiescent state.
On the other hand, if it was already sent, we don't need to do it again
when another CPU detects overflow of the queue.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/allocpercpu.c')
0 files changed, 0 insertions, 0 deletions