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Groups > linux.kernel > #1517788
| From | Byungchul Park <byungchul.park@lge.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 2/2] rcu: Force resched_cpu when jiffies >= rcu_state.jiffies_resched |
| Date | 2016-11-09 07:40 +0100 |
| Message-ID | <sBuI9-3HT-1@gated-at.bofh.it> (permalink) |
| References | <sBuI9-3HT-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Currently rcu code forces CPU into scheduler when jiffies >= rcu_state.gp_start + jiffies_till_sched_qs, via resched_cpu(). It would be better to force CPU into scheduler when jiffies >= rcu_state.jiffies_resched, too. Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- kernel/rcu/tree.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index d8e8859..287f468 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1217,11 +1217,10 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, READ_ONCE(*rcrmp) + rdp->rsp->flavor_mask); } rdp->rsp->jiffies_resched += 5; /* Re-enable beating. */ - } - /* And if it has been a really long time, kick the CPU as well. */ - if (ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs)) + /* And if it has been a really long time, kick the CPU as well. */ resched_cpu(rdp->cpu); /* Force CPU into scheduler. */ + } return 0; } -- 1.9.1
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[PATCH 2/2] rcu: Force resched_cpu when jiffies >= rcu_state.jiffies_resched Byungchul Park <byungchul.park@lge.com> - 2016-11-09 07:40 +0100
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