diff options
author | Eric Dumazet <dada1@cosmosbay.com> | 2005-10-17 20:01:21 +0200 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-17 15:27:58 -0700 |
commit | 5ee832dbc6770135ec8d63296af0a4374557bb79 (patch) | |
tree | 80ffdc157100df18f1c18d39f5036a9b798f2c06 | |
parent | cc675230a9ca17010694bc8bd3c69ca9adf2efef (diff) | |
download | kernel_samsung_tuna-5ee832dbc6770135ec8d63296af0a4374557bb79.zip kernel_samsung_tuna-5ee832dbc6770135ec8d63296af0a4374557bb79.tar.gz kernel_samsung_tuna-5ee832dbc6770135ec8d63296af0a4374557bb79.tar.bz2 |
[PATCH] rcu: keep rcu callback event counter
This makes call_rcu() keep track of how many events there are on the RCU
list, and cause a reschedule event when the list gets too long.
This helps keep RCU event lists down.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | include/linux/rcupdate.h | 1 | ||||
-rw-r--r-- | kernel/rcupdate.c | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 4e65eb4..70191a5 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -94,6 +94,7 @@ struct rcu_data { long batch; /* Batch # for current RCU batch */ struct rcu_head *nxtlist; struct rcu_head **nxttail; + long count; /* # of queued items */ struct rcu_head *curlist; struct rcu_head **curtail; struct rcu_head *donelist; diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c index dd99415..2559d4b 100644 --- a/kernel/rcupdate.c +++ b/kernel/rcupdate.c @@ -109,6 +109,10 @@ void fastcall call_rcu(struct rcu_head *head, rdp = &__get_cpu_var(rcu_data); *rdp->nxttail = head; rdp->nxttail = &head->next; + + if (unlikely(++rdp->count > 10000)) + set_need_resched(); + local_irq_restore(flags); } @@ -140,6 +144,12 @@ void fastcall call_rcu_bh(struct rcu_head *head, rdp = &__get_cpu_var(rcu_bh_data); *rdp->nxttail = head; rdp->nxttail = &head->next; + rdp->count++; +/* + * Should we directly call rcu_do_batch() here ? + * if (unlikely(rdp->count > 10000)) + * rcu_do_batch(rdp); + */ local_irq_restore(flags); } @@ -157,6 +167,7 @@ static void rcu_do_batch(struct rcu_data *rdp) next = rdp->donelist = list->next; list->func(list); list = next; + rdp->count--; if (++count >= maxbatch) break; } |