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Date: Tue, 06 Feb 2007 11:10:44 +0100
From: Arjan van de Ven <arjan@...radead.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: v2.6.20-rt1, yum/rpm
On Mon, 2007-02-05 at 07:56 +0100, Ingo Molnar wrote:
> i have released the v2.6.20-rt1 kernel, which can be downloaded from the
> usual place:
>
> http://redhat.com/~mingo/realtime-preempt/
>
> more info about the -rt patchset can be found in the RT wiki:
>
> http://rt.wiki.kernel.org
>
> This is a fixes-only release. Since the -rt tree has been closely
> tracking Linus' upstream kernel since -rc1, no new issues are expected -
> please re-report if anything is still unfixed.
patch below has 2 tweaks
1) the new RCU feature wakes up once per second, make sure this is using
the new round_jiffies() infrastructure
2) the slab background reap code is waking up once per 2 seconds per
cpu. The patch makes this more dynamic; if no work was done (no activity
on the cpu happened) then this is made to be 4 seconds
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
Index: linux-2.6.20-rt2/kernel/rcupreempt.c
===================================================================
--- linux-2.6.20-rt2.orig/kernel/rcupreempt.c
+++ linux-2.6.20-rt2/kernel/rcupreempt.c
@@ -465,7 +465,7 @@ static int rcu_booster(void *arg)
* adjust, or eliminate in case of OOM.
*/
- schedule_timeout_interruptible(HZ);
+ schedule_timeout_interruptible(round_jiffies_relative(HZ));
/* Print stats if enough time has passed. */
Index: linux-2.6.20-rt2/kernel/rcutorture.c
===================================================================
--- linux-2.6.20-rt2.orig/kernel/rcutorture.c
+++ linux-2.6.20-rt2/kernel/rcutorture.c
@@ -288,7 +288,7 @@ static int rcu_torture_preempt(void *arg
cond_resched();
if (rcu_torture_completed() == completedstart)
rcu_torture_preempt_errors++;
- schedule_timeout_interruptible(HZ);
+ schedule_timeout_interruptible(round_jiffies_relative(HZ));
} while (!kthread_should_stop());
return 0;
}
@@ -660,7 +660,7 @@ rcu_torture_reader(void *arg)
if (p == NULL) {
/* Wait for rcu_torture_writer to get underway */
cur_ops->readunlock(idx);
- schedule_timeout_interruptible(HZ);
+ schedule_timeout_interruptible(round_jiffies_relative(HZ));
continue;
}
if (p->rtort_mbtest == 0)
Index: linux-2.6.20-rt2/mm/slab.c
===================================================================
--- linux-2.6.20-rt2.orig/mm/slab.c
+++ linux-2.6.20-rt2/mm/slab.c
@@ -1062,7 +1062,7 @@ static int transfer_objects(struct array
#ifndef CONFIG_NUMA
#define drain_alien_cache(cachep, alien) do { } while (0)
-#define reap_alien(cachep, l3, this_cpu) do { } while (0)
+#define reap_alien(cachep, l3, this_cpu) 0
static inline struct array_cache **alloc_alien_cache(int node, int limit)
{
@@ -1160,7 +1160,7 @@ static void __drain_alien_cache(struct k
/*
* Called from cache_reap() to regularly drain alien caches round robin.
*/
-static void
+static int
reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3, int *this_cpu)
{
int node = per_cpu(reap_node, *this_cpu);
@@ -1171,8 +1171,10 @@ reap_alien(struct kmem_cache *cachep, st
if (ac && ac->avail && spin_trylock_irq(&ac->lock)) {
__drain_alien_cache(cachep, ac, node, this_cpu);
spin_unlock_irq(&ac->lock);
+ return 1;
}
}
+ return 0;
}
static void drain_alien_cache(struct kmem_cache *cachep,
@@ -2473,7 +2475,7 @@ static void check_spinlock_acquired_node
#define check_spinlock_acquired_node(x, y) do { } while(0)
#endif
-static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
+static int drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
struct array_cache *ac,
int force, int node);
@@ -4114,15 +4116,16 @@ static int enable_cpucache(struct kmem_c
* Drain an array if it contains any elements taking the l3 lock only if
* necessary. Note that the l3 listlock also protects the array_cache
* if drain_array() is used on the shared array.
+ * returns non-zero if some work is done
*/
-void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
+int drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
struct array_cache *ac, int force, int node)
{
int this_cpu = smp_processor_id();
int tofree;
if (!ac || !ac->avail)
- return;
+ return 0;
if (ac->touched && !force) {
ac->touched = 0;
} else {
@@ -4138,6 +4141,7 @@ void drain_array(struct kmem_cache *cach
}
slab_spin_unlock_irq(&l3->list_lock, this_cpu);
}
+ return 1;
}
/**
@@ -4157,6 +4161,7 @@ static void cache_reap(struct work_struc
int this_cpu = raw_smp_processor_id(), node = cpu_to_node(this_cpu);
struct kmem_cache *searchp;
struct kmem_list3 *l3;
+ int work_done = 0;
if (!mutex_trylock(&cache_chain_mutex)) {
/* Give up. Setup the next iteration. */
@@ -4175,10 +4180,10 @@ static void cache_reap(struct work_struc
*/
l3 = searchp->nodelists[node];
- reap_alien(searchp, l3, &this_cpu);
+ work_done += reap_alien(searchp, l3, &this_cpu);
- drain_array(searchp, l3, cpu_cache_get(searchp, this_cpu),
- 0, node);
+ work_done += drain_array(searchp, l3,
+ cpu_cache_get(searchp, this_cpu), 0, node);
/*
* These are racy checks but it does not matter
@@ -4189,7 +4194,7 @@ static void cache_reap(struct work_struc
l3->next_reap = jiffies + REAPTIMEOUT_LIST3;
- drain_array(searchp, l3, l3->shared, 0, node);
+ work_done += drain_array(searchp, l3, l3->shared, 0, node);
if (l3->free_touched)
l3->free_touched = 0;
@@ -4207,9 +4212,10 @@ next:
mutex_unlock(&cache_chain_mutex);
next_reap_node();
refresh_cpu_vm_stats(smp_processor_id());
+
/* Set up the next iteration */
schedule_delayed_work(&__get_cpu_var(reap_work),
- round_jiffies_relative(REAPTIMEOUT_CPUC));
+ round_jiffies_relative((1+!work_done) * REAPTIMEOUT_CPUC));
}
#ifdef CONFIG_PROC_FS
-
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