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[PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event_local) reading functions

Chen Ridong posted 4 patches 11 months ago
There is a newer version of this series
[PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event_local) reading functions
Posted by Chen Ridong 11 months ago 
From: Chen Ridong <chenridong@huawei.com>

The only difference between 'lruvec_page_state' and
'lruvec_page_state_local' is that they read 'state' and 'state_local',
respectively. Factor out an inner functions to make the code more concise.
Do the same for reading 'memcg_page_stat' and 'memcg_events'.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
---
 mm/memcontrol.c | 72 +++++++++++++++++++++----------------------------
 1 file changed, 30 insertions(+), 42 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b10e0a8f3375..14541610cad0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -375,7 +375,8 @@ struct lruvec_stats {
 	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
 };
 
-unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
+static unsigned long __lruvec_page_state(struct lruvec *lruvec,
+		enum node_stat_item idx, bool local)
 {
 	struct mem_cgroup_per_node *pn;
 	long x;
@@ -389,7 +390,8 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
 		return 0;
 
 	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
-	x = READ_ONCE(pn->lruvec_stats->state[i]);
+	x = local ? READ_ONCE(pn->lruvec_stats->state_local[i]) :
+		    READ_ONCE(pn->lruvec_stats->state[i]);
 #ifdef CONFIG_SMP
 	if (x < 0)
 		x = 0;
@@ -397,27 +399,16 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
 	return x;
 }
 
+
+unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
+{
+	return __lruvec_page_state(lruvec, idx, false);
+}
+
 unsigned long lruvec_page_state_local(struct lruvec *lruvec,
 				      enum node_stat_item idx)
 {
-	struct mem_cgroup_per_node *pn;
-	long x;
-	int i;
-
-	if (mem_cgroup_disabled())
-		return node_page_state(lruvec_pgdat(lruvec), idx);
-
-	i = memcg_stats_index(idx);
-	if (WARN_ONCE(BAD_STAT_IDX(i), "%s: missing stat item %d\n", __func__, idx))
-		return 0;
-
-	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
-	x = READ_ONCE(pn->lruvec_stats->state_local[i]);
-#ifdef CONFIG_SMP
-	if (x < 0)
-		x = 0;
-#endif
-	return x;
+	return __lruvec_page_state(lruvec, idx, true);
 }
 
 /* Subset of vm_event_item to report for memcg event stats */
@@ -651,7 +642,7 @@ static void flush_memcg_stats_dwork(struct work_struct *w)
 	queue_delayed_work(system_unbound_wq, &stats_flush_dwork, FLUSH_TIME);
 }
 
-unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
+static unsigned long __memcg_page_state(struct mem_cgroup *memcg, int idx, bool local)
 {
 	long x;
 	int i = memcg_stats_index(idx);
@@ -659,7 +650,9 @@ unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
 	if (WARN_ONCE(BAD_STAT_IDX(i), "%s: missing stat item %d\n", __func__, idx))
 		return 0;
 
-	x = READ_ONCE(memcg->vmstats->state[i]);
+	x = local ? READ_ONCE(memcg->vmstats->state_local[i]) :
+		    READ_ONCE(memcg->vmstats->state[i]);
+
 #ifdef CONFIG_SMP
 	if (x < 0)
 		x = 0;
@@ -667,6 +660,11 @@ unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
 	return x;
 }
 
+unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
+{
+	return __memcg_page_state(memcg, idx, false);
+}
+
 static int memcg_page_state_unit(int item);
 
 /*
@@ -709,18 +707,7 @@ void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
 /* idx can be of type enum memcg_stat_item or node_stat_item. */
 unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx)
 {
-	long x;
-	int i = memcg_stats_index(idx);
-
-	if (WARN_ONCE(BAD_STAT_IDX(i), "%s: missing stat item %d\n", __func__, idx))
-		return 0;
-
-	x = READ_ONCE(memcg->vmstats->state_local[i]);
-#ifdef CONFIG_SMP
-	if (x < 0)
-		x = 0;
-#endif
-	return x;
+	return __memcg_page_state(memcg, idx, true);
 }
 
 static void __mod_memcg_lruvec_state(struct lruvec *lruvec,
@@ -859,24 +846,25 @@ void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
 	memcg_stats_unlock();
 }
 
-unsigned long memcg_events(struct mem_cgroup *memcg, int event)
+static unsigned long __memcg_events(struct mem_cgroup *memcg, int event, bool local)
 {
 	int i = memcg_events_index(event);
 
 	if (WARN_ONCE(BAD_STAT_IDX(i), "%s: missing stat item %d\n", __func__, event))
 		return 0;
 
-	return READ_ONCE(memcg->vmstats->events[i]);
+	return local ? READ_ONCE(memcg->vmstats->events_local[i]) :
+		    READ_ONCE(memcg->vmstats->events[i]);
 }
 
-unsigned long memcg_events_local(struct mem_cgroup *memcg, int event)
+unsigned long memcg_events(struct mem_cgroup *memcg, int event)
 {
-	int i = memcg_events_index(event);
-
-	if (WARN_ONCE(BAD_STAT_IDX(i), "%s: missing stat item %d\n", __func__, event))
-		return 0;
+	return __memcg_events(memcg, event, false);
+}
 
-	return READ_ONCE(memcg->vmstats->events_local[i]);
+unsigned long memcg_events_local(struct mem_cgroup *memcg, int event)
+{
+	return __memcg_events(memcg, event, true);
 }
 
 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
-- 
2.34.1
Re: [PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event_local) reading functions
Posted by Roman Gushchin 11 months ago 
On Tue, Jan 14, 2025 at 12:25:19PM +0000, Chen Ridong wrote:
> From: Chen Ridong <chenridong@huawei.com>
> 
> The only difference between 'lruvec_page_state' and
> 'lruvec_page_state_local' is that they read 'state' and 'state_local',
> respectively. Factor out an inner functions to make the code more concise.
> Do the same for reading 'memcg_page_stat' and 'memcg_events'.
> 
> Signed-off-by: Chen Ridong <chenridong@huawei.com>
> ---
>  mm/memcontrol.c | 72 +++++++++++++++++++++----------------------------
>  1 file changed, 30 insertions(+), 42 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index b10e0a8f3375..14541610cad0 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -375,7 +375,8 @@ struct lruvec_stats {
>  	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
>  };
>  
> -unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> +static unsigned long __lruvec_page_state(struct lruvec *lruvec,
> +		enum node_stat_item idx, bool local)
>  {
>  	struct mem_cgroup_per_node *pn;
>  	long x;
> @@ -389,7 +390,8 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>  		return 0;
>  
>  	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
> -	x = READ_ONCE(pn->lruvec_stats->state[i]);
> +	x = local ? READ_ONCE(pn->lruvec_stats->state_local[i]) :
> +		    READ_ONCE(pn->lruvec_stats->state[i]);
>  #ifdef CONFIG_SMP
>  	if (x < 0)
>  		x = 0;
> @@ -397,27 +399,16 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>  	return x;
>  }
>  
> +
> +unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> +{
> +	return __lruvec_page_state(lruvec, idx, false);
> +}

I'd move these wrapper function definitions to memcontrol.h and make them
static inline.

Other than that, lgtm.

Thank you!
Re: [PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event_local) reading functions
Posted by Shakeel Butt 11 months ago 
On Tue, Jan 14, 2025 at 06:45:20PM +0000, Roman Gushchin wrote:
> On Tue, Jan 14, 2025 at 12:25:19PM +0000, Chen Ridong wrote:
> > From: Chen Ridong <chenridong@huawei.com>
> > 
> > The only difference between 'lruvec_page_state' and
> > 'lruvec_page_state_local' is that they read 'state' and 'state_local',
> > respectively. Factor out an inner functions to make the code more concise.
> > Do the same for reading 'memcg_page_stat' and 'memcg_events'.
> > 
> > Signed-off-by: Chen Ridong <chenridong@huawei.com>
> > ---
> >  mm/memcontrol.c | 72 +++++++++++++++++++++----------------------------
> >  1 file changed, 30 insertions(+), 42 deletions(-)
> > 
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index b10e0a8f3375..14541610cad0 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -375,7 +375,8 @@ struct lruvec_stats {
> >  	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
> >  };
> >  
> > -unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> > +static unsigned long __lruvec_page_state(struct lruvec *lruvec,
> > +		enum node_stat_item idx, bool local)
> >  {
> >  	struct mem_cgroup_per_node *pn;
> >  	long x;
> > @@ -389,7 +390,8 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> >  		return 0;
> >  
> >  	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
> > -	x = READ_ONCE(pn->lruvec_stats->state[i]);
> > +	x = local ? READ_ONCE(pn->lruvec_stats->state_local[i]) :
> > +		    READ_ONCE(pn->lruvec_stats->state[i]);
> >  #ifdef CONFIG_SMP
> >  	if (x < 0)
> >  		x = 0;
> > @@ -397,27 +399,16 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> >  	return x;
> >  }
> >  
> > +
> > +unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
> > +{
> > +	return __lruvec_page_state(lruvec, idx, false);
> > +}
> 
> I'd move these wrapper function definitions to memcontrol.h and make them
> static inline.

+1

> 
> Other than that, lgtm.
> 
> Thank you!
Re: [PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event_local) reading functions
Posted by Chen Ridong 11 months ago 

On 2025/1/16 8:57, Shakeel Butt wrote:
> On Tue, Jan 14, 2025 at 06:45:20PM +0000, Roman Gushchin wrote:
>> On Tue, Jan 14, 2025 at 12:25:19PM +0000, Chen Ridong wrote:
>>> From: Chen Ridong <chenridong@huawei.com>
>>>
>>> The only difference between 'lruvec_page_state' and
>>> 'lruvec_page_state_local' is that they read 'state' and 'state_local',
>>> respectively. Factor out an inner functions to make the code more concise.
>>> Do the same for reading 'memcg_page_stat' and 'memcg_events'.
>>>
>>> Signed-off-by: Chen Ridong <chenridong@huawei.com>
>>> ---
>>>  mm/memcontrol.c | 72 +++++++++++++++++++++----------------------------
>>>  1 file changed, 30 insertions(+), 42 deletions(-)
>>>
>>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>>> index b10e0a8f3375..14541610cad0 100644
>>> --- a/mm/memcontrol.c
>>> +++ b/mm/memcontrol.c
>>> @@ -375,7 +375,8 @@ struct lruvec_stats {
>>>  	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
>>>  };
>>>  
>>> -unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>> +static unsigned long __lruvec_page_state(struct lruvec *lruvec,
>>> +		enum node_stat_item idx, bool local)
>>>  {
>>>  	struct mem_cgroup_per_node *pn;
>>>  	long x;
>>> @@ -389,7 +390,8 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>>  		return 0;
>>>  
>>>  	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
>>> -	x = READ_ONCE(pn->lruvec_stats->state[i]);
>>> +	x = local ? READ_ONCE(pn->lruvec_stats->state_local[i]) :
>>> +		    READ_ONCE(pn->lruvec_stats->state[i]);
>>>  #ifdef CONFIG_SMP
>>>  	if (x < 0)
>>>  		x = 0;
>>> @@ -397,27 +399,16 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>>  	return x;
>>>  }
>>>  
>>> +
>>> +unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>> +{
>>> +	return __lruvec_page_state(lruvec, idx, false);
>>> +}
>>
>> I'd move these wrapper function definitions to memcontrol.h and make them
>> static inline.
> 
> +1
> 

Thank you.

Will update.

Best regards,
Ridong
>>
>> Other than that, lgtm.
>>
>> Thank you!

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