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Date: Thu, 19 Jul 2012 18:19:14 +0800
From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, Michal Hocko <mhocko@suse.cz>,
        Johannes Weiner <hannes@cmpxchg.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Gavin Shan <shangw@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org,
        "Kirill A. Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH] mm/memcg: wrap mem_cgroup_from_css function
Message-ID: <20120719101914.GA13612@kernel>
Reply-To: Wanpeng Li <liwanp@linux.vnet.ibm.com>
References: <a>
 <1342580730-25703-1-git-send-email-liwanp@linux.vnet.ibm.com>
 <20120719091420.GA2549@shutemov.name>
 <20120719092309.GA12409@kernel>
 <20120719093835.GA3776@shangw.(null)>
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On Thu, Jul 19, 2012 at 05:38:35PM +0800, Gavin Shan wrote:
>On Thu, Jul 19, 2012 at 05:23:09PM +0800, Wanpeng Li wrote:
>>On Thu, Jul 19, 2012 at 12:14:20PM +0300, Kirill A. Shutemov wrote:
>>>On Wed, Jul 18, 2012 at 11:05:30AM +0800, Wanpeng Li wrote:
>>>> wrap mem_cgroup_from_css function to clarify get mem cgroup
>>>> from cgroup_subsys_state.
>>>> 
>>>> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>>>> Cc: Michal Hocko <mhocko@suse.cz>
>>>> Cc: Johannes Weiner <hannes@cmpxchg.org>
>>>> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>>>> Cc: Andrew Morton <akpm@linux-foundation.org>
>>>> Cc: Gavin Shan <shangw@linux.vnet.ibm.com>
>>>> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>>>> Cc: linux-kernel@vger.kernel.org
>>>> ---
>>>>  mm/memcontrol.c |   14 ++++++++++----
>>>>  1 files changed, 10 insertions(+), 4 deletions(-)
>>>> 
>>>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>>>> index 58a08fc..20f6a15 100644
>>>> --- a/mm/memcontrol.c
>>>> +++ b/mm/memcontrol.c
>>>> @@ -396,6 +396,12 @@ static void mem_cgroup_put(struct mem_cgroup *memcg);
>>>>  #include <net/sock.h>
>>>>  #include <net/ip.h>
>>>>  
>>>> +static inline
>>>> +struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
>>>> +{
>>>> +	return container_of(s, struct mem_cgroup, css);
>>>> +}
>>>> +
>>>>  static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
>>>>  void sock_update_memcg(struct sock *sk)
>>>>  {
>>>> @@ -820,7 +826,7 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
>>>>  
>>>>  struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
>>>>  {
>>>> -	return container_of(cgroup_subsys_state(cont,
>>>> +	return mem_cgroup_from_css(cgroup_subsys_state(cont,
>>>>  				mem_cgroup_subsys_id), struct mem_cgroup,
>>>>  				css);
>>>
>>>Hm?.. Here and below too many args to mem_cgroup_from_css().
>>>Have you tested the code?
>>
>>Hi, what's the meaning of "two many"?
>>
>
>It might be the typo for "two" here. I think it would be
>"too". However, it seems that you had pass "two" more arguments
>here to mem_cgroup_from_css() since the function only takes "one"
>parameter as you implemented before.
>
>+struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
>
>+   return mem_cgroup_from_css(cgroup_subsys_state(cont,
>+		mem_cgroup_subsys_id), struct mem_cgroup,
>+		css);
>

Hi Andrew, 

Sorry for make a mistake. Please drop this patch from linux-mm 
and merged the new one. BTW, thanks Gavin and Kirill.

Best Regards,
Wanpeng Li


>Thanks,
>Gavin
>
>>cgroup_subsys_state(cont, mem_cgroup_subsys_id) and 
>>task_subsys_state(p, mem_cgroup_subsys_id) both are 
>>just one arg in mem_cgroup_from_css. :-)
>>
>>>
>>>>  }
>>>> @@ -835,7 +841,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
>>>>  	if (unlikely(!p))
>>>>  		return NULL;
>>>>  
>>>> -	return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
>>>> +	return mem_cgroup_from_css(task_subsys_state(p, mem_cgroup_subsys_id),
>>>>  				struct mem_cgroup, css);
>>>>  }
>>>>  
>>>> @@ -922,7 +928,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
>>>>  		css = css_get_next(&mem_cgroup_subsys, id + 1, &root->css, &id);
>>>>  		if (css) {
>>>>  			if (css == &root->css || css_tryget(css))
>>>> -				memcg = container_of(css,
>>>> +				memcg = mem_cgroup_from_css(css,
>>>>  						     struct mem_cgroup, css);
>>>>  		} else
>>>>  			id = 0;
>>>> @@ -2406,7 +2412,7 @@ static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
>>>>  	css = css_lookup(&mem_cgroup_subsys, id);
>>>>  	if (!css)
>>>>  		return NULL;
>>>> -	return container_of(css, struct mem_cgroup, css);
>>>> +	return mem_cgroup_from_css(css, struct mem_cgroup, css);
>>>>  }
>>>>  
>>>>  struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
>>>> -- 
>>>> 1.7.5.4
>>>> 
>>>> --
>>>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
>>>> the body to majordomo@kvack.org.  For more info on Linux MM,
>>>> see: http://www.linux-mm.org/ .
>>>> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>>>
>>>-- 
>>> Kirill A. Shutemov
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org.  For more info on Linux MM,
>see: http://www.linux-mm.org/ .
>Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

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Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment; filename="0001-memcg-add-mem_cgroup_from_css-helper.patch"

>>From ca3849a5633d578d6a924817fad5602641707285 Mon Sep 17 00:00:00 2001
From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Date: Thu, 19 Jul 2012 18:08:31 +0800
Subject: [PATCH] memcg: add mem_cgroup_from_css() helper

Add a mem_cgroup_from_css() helper to replace open-coded invokations of
container_of().  To clarify the code and to add a little more type safety.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 mm/memcontrol.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f72b5e5..2136560 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -412,6 +412,12 @@ static void mem_cgroup_put(struct mem_cgroup *memcg);
 #include <net/sock.h>
 #include <net/ip.h>
 
+static inline
+struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
+{
+	return container_of(s, struct mem_cgroup, css);
+}
+
 static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
 void sock_update_memcg(struct sock *sk)
 {
@@ -864,9 +870,8 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
 
 struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
 {
-	return container_of(cgroup_subsys_state(cont,
-				mem_cgroup_subsys_id), struct mem_cgroup,
-				css);
+	return mem_cgroup_from_css(cgroup_subsys_state(cont,
+				mem_cgroup_subsys_id));
 }
 
 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
@@ -879,8 +884,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
 	if (unlikely(!p))
 		return NULL;
 
-	return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
-				struct mem_cgroup, css);
+	return mem_cgroup_from_css(task_subsys_state(p, mem_cgroup_subsys_id));
 }
 
 struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
@@ -966,8 +970,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
 		css = css_get_next(&mem_cgroup_subsys, id + 1, &root->css, &id);
 		if (css) {
 			if (css == &root->css || css_tryget(css))
-				memcg = container_of(css,
-						     struct mem_cgroup, css);
+				memcg = mem_cgroup_from_css(css);
 		} else
 			id = 0;
 		rcu_read_unlock();
@@ -2429,7 +2432,7 @@ static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
 	css = css_lookup(&mem_cgroup_subsys, id);
 	if (!css)
 		return NULL;
-	return container_of(css, struct mem_cgroup, css);
+	return mem_cgroup_from_css(css);
 }
 
 struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
-- 
1.7.7.6


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Date: Thu, 19 Jul 2012 18:19:14 +0800
From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Subject: Re: [PATCH] mm/memcg: wrap mem_cgroup_from_css function
Message-ID: <20120719101914.GA13612@kernel>
Reply-To: Wanpeng Li <liwanp@linux.vnet.ibm.com>
References: <a>
 <1342580730-25703-1-git-send-email-liwanp@linux.vnet.ibm.com>
 <20120719091420.GA2549@shutemov.name>
 <20120719092309.GA12409@kernel>
 <20120719093835.GA3776@shangw.(null)>
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List-ID: <linux-mm.kvack.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, Michal Hocko <mhocko@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Gavin Shan <shangw@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" <kirill@shutemov.name>

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On Thu, Jul 19, 2012 at 05:38:35PM +0800, Gavin Shan wrote:
>On Thu, Jul 19, 2012 at 05:23:09PM +0800, Wanpeng Li wrote:
>>On Thu, Jul 19, 2012 at 12:14:20PM +0300, Kirill A. Shutemov wrote:
>>>On Wed, Jul 18, 2012 at 11:05:30AM +0800, Wanpeng Li wrote:
>>>> wrap mem_cgroup_from_css function to clarify get mem cgroup
>>>> from cgroup_subsys_state.
>>>> 
>>>> Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>>>> Cc: Michal Hocko <mhocko@suse.cz>
>>>> Cc: Johannes Weiner <hannes@cmpxchg.org>
>>>> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
>>>> Cc: Andrew Morton <akpm@linux-foundation.org>
>>>> Cc: Gavin Shan <shangw@linux.vnet.ibm.com>
>>>> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
>>>> Cc: linux-kernel@vger.kernel.org
>>>> ---
>>>>  mm/memcontrol.c |   14 ++++++++++----
>>>>  1 files changed, 10 insertions(+), 4 deletions(-)
>>>> 
>>>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>>>> index 58a08fc..20f6a15 100644
>>>> --- a/mm/memcontrol.c
>>>> +++ b/mm/memcontrol.c
>>>> @@ -396,6 +396,12 @@ static void mem_cgroup_put(struct mem_cgroup *memcg);
>>>>  #include <net/sock.h>
>>>>  #include <net/ip.h>
>>>>  
>>>> +static inline
>>>> +struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
>>>> +{
>>>> +	return container_of(s, struct mem_cgroup, css);
>>>> +}
>>>> +
>>>>  static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
>>>>  void sock_update_memcg(struct sock *sk)
>>>>  {
>>>> @@ -820,7 +826,7 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
>>>>  
>>>>  struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
>>>>  {
>>>> -	return container_of(cgroup_subsys_state(cont,
>>>> +	return mem_cgroup_from_css(cgroup_subsys_state(cont,
>>>>  				mem_cgroup_subsys_id), struct mem_cgroup,
>>>>  				css);
>>>
>>>Hm?.. Here and below too many args to mem_cgroup_from_css().
>>>Have you tested the code?
>>
>>Hi, what's the meaning of "two many"?
>>
>
>It might be the typo for "two" here. I think it would be
>"too". However, it seems that you had pass "two" more arguments
>here to mem_cgroup_from_css() since the function only takes "one"
>parameter as you implemented before.
>
>+struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
>
>+   return mem_cgroup_from_css(cgroup_subsys_state(cont,
>+		mem_cgroup_subsys_id), struct mem_cgroup,
>+		css);
>

Hi Andrew, 

Sorry for make a mistake. Please drop this patch from linux-mm 
and merged the new one. BTW, thanks Gavin and Kirill.

Best Regards,
Wanpeng Li


>Thanks,
>Gavin
>
>>cgroup_subsys_state(cont, mem_cgroup_subsys_id) and 
>>task_subsys_state(p, mem_cgroup_subsys_id) both are 
>>just one arg in mem_cgroup_from_css. :-)
>>
>>>
>>>>  }
>>>> @@ -835,7 +841,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
>>>>  	if (unlikely(!p))
>>>>  		return NULL;
>>>>  
>>>> -	return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
>>>> +	return mem_cgroup_from_css(task_subsys_state(p, mem_cgroup_subsys_id),
>>>>  				struct mem_cgroup, css);
>>>>  }
>>>>  
>>>> @@ -922,7 +928,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
>>>>  		css = css_get_next(&mem_cgroup_subsys, id + 1, &root->css, &id);
>>>>  		if (css) {
>>>>  			if (css == &root->css || css_tryget(css))
>>>> -				memcg = container_of(css,
>>>> +				memcg = mem_cgroup_from_css(css,
>>>>  						     struct mem_cgroup, css);
>>>>  		} else
>>>>  			id = 0;
>>>> @@ -2406,7 +2412,7 @@ static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
>>>>  	css = css_lookup(&mem_cgroup_subsys, id);
>>>>  	if (!css)
>>>>  		return NULL;
>>>> -	return container_of(css, struct mem_cgroup, css);
>>>> +	return mem_cgroup_from_css(css, struct mem_cgroup, css);
>>>>  }
>>>>  
>>>>  struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
>>>> -- 
>>>> 1.7.5.4
>>>> 
>>>> --
>>>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
>>>> the body to majordomo@kvack.org.  For more info on Linux MM,
>>>> see: http://www.linux-mm.org/ .
>>>> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
>>>
>>>-- 
>>> Kirill A. Shutemov
>
>--
>To unsubscribe, send a message with 'unsubscribe linux-mm' in
>the body to majordomo@kvack.org.  For more info on Linux MM,
>see: http://www.linux-mm.org/ .
>Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

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