* [PATCH] memcg: modify swap accounting function to support THP
@ 2013-01-10 11:43 Sha Zhengju
2013-01-10 13:39 ` Michal Hocko
0 siblings, 1 reply; 3+ messages in thread
From: Sha Zhengju @ 2013-01-10 11:43 UTC (permalink / raw)
To: linux-kernel, cgroups, linux-mm
Cc: mhocko, akpm, kamezawa.hiroyu, Sha Zhengju
From: Sha Zhengju <handai.szj@taobao.com>
Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
---
mm/memcontrol.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3817460..674cf21 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -914,10 +914,9 @@ static long mem_cgroup_read_stat(struct mem_cgroup *memcg,
}
static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
- bool charge)
+ int nr_pages)
{
- int val = (charge) ? 1 : -1;
- this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], val);
+ this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], nr_pages);
}
static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
@@ -4107,7 +4106,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
*/
memcg_check_events(memcg, page);
if (do_swap_account && ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) {
- mem_cgroup_swap_statistics(memcg, true);
+ mem_cgroup_swap_statistics(memcg, nr_pages);
mem_cgroup_get(memcg);
}
/*
@@ -4238,7 +4237,7 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent)
*/
if (!mem_cgroup_is_root(memcg))
res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
- mem_cgroup_swap_statistics(memcg, false);
+ mem_cgroup_swap_statistics(memcg, -1);
mem_cgroup_put(memcg);
}
rcu_read_unlock();
@@ -4267,8 +4266,8 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry,
new_id = css_id(&to->css);
if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
- mem_cgroup_swap_statistics(from, false);
- mem_cgroup_swap_statistics(to, true);
+ mem_cgroup_swap_statistics(from, -1);
+ mem_cgroup_swap_statistics(to, 1);
/*
* This function is only called from task migration context now.
* It postpones res_counter and refcount handling till the end
--
1.7.9.5
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] memcg: modify swap accounting function to support THP
2013-01-10 11:43 [PATCH] memcg: modify swap accounting function to support THP Sha Zhengju
@ 2013-01-10 13:39 ` Michal Hocko
2013-01-11 3:45 ` Sha Zhengju
0 siblings, 1 reply; 3+ messages in thread
From: Michal Hocko @ 2013-01-10 13:39 UTC (permalink / raw)
To: Sha Zhengju
Cc: linux-kernel, cgroups, linux-mm, akpm, kamezawa.hiroyu, Sha Zhengju
On Thu 10-01-13 19:43:58, Sha Zhengju wrote:
> From: Sha Zhengju <handai.szj@taobao.com>
THP are not swapped out because they are split before so this change
doesn't make much sense to me.
> Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
> ---
> mm/memcontrol.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3817460..674cf21 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -914,10 +914,9 @@ static long mem_cgroup_read_stat(struct mem_cgroup *memcg,
> }
>
> static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
> - bool charge)
> + int nr_pages)
> {
> - int val = (charge) ? 1 : -1;
> - this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], val);
> + this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], nr_pages);
> }
>
> static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
> @@ -4107,7 +4106,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
> */
> memcg_check_events(memcg, page);
> if (do_swap_account && ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) {
> - mem_cgroup_swap_statistics(memcg, true);
> + mem_cgroup_swap_statistics(memcg, nr_pages);
> mem_cgroup_get(memcg);
> }
> /*
> @@ -4238,7 +4237,7 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent)
> */
> if (!mem_cgroup_is_root(memcg))
> res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
> - mem_cgroup_swap_statistics(memcg, false);
> + mem_cgroup_swap_statistics(memcg, -1);
> mem_cgroup_put(memcg);
> }
> rcu_read_unlock();
> @@ -4267,8 +4266,8 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry,
> new_id = css_id(&to->css);
>
> if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
> - mem_cgroup_swap_statistics(from, false);
> - mem_cgroup_swap_statistics(to, true);
> + mem_cgroup_swap_statistics(from, -1);
> + mem_cgroup_swap_statistics(to, 1);
> /*
> * This function is only called from task migration context now.
> * It postpones res_counter and refcount handling till the end
> --
> 1.7.9.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Michal Hocko
SUSE Labs
--
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] memcg: modify swap accounting function to support THP
2013-01-10 13:39 ` Michal Hocko
@ 2013-01-11 3:45 ` Sha Zhengju
0 siblings, 0 replies; 3+ messages in thread
From: Sha Zhengju @ 2013-01-11 3:45 UTC (permalink / raw)
To: Michal Hocko
Cc: linux-kernel, cgroups, linux-mm, akpm, kamezawa.hiroyu, Sha Zhengju
On Thu, Jan 10, 2013 at 9:39 PM, Michal Hocko <mhocko@suse.cz> wrote:
> On Thu 10-01-13 19:43:58, Sha Zhengju wrote:
>> From: Sha Zhengju <handai.szj@taobao.com>
>
> THP are not swapped out because they are split before so this change
> doesn't make much sense to me.
Yes... I have been puzzled by 'nr_pages' in __mem_cgroup_uncharge_common..
Sorry for the noise. : )
>
>> Signed-off-by: Sha Zhengju <handai.szj@taobao.com>
>> ---
>> mm/memcontrol.c | 13 ++++++-------
>> 1 file changed, 6 insertions(+), 7 deletions(-)
>>
>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>> index 3817460..674cf21 100644
>> --- a/mm/memcontrol.c
>> +++ b/mm/memcontrol.c
>> @@ -914,10 +914,9 @@ static long mem_cgroup_read_stat(struct mem_cgroup *memcg,
>> }
>>
>> static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
>> - bool charge)
>> + int nr_pages)
>> {
>> - int val = (charge) ? 1 : -1;
>> - this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], val);
>> + this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_SWAP], nr_pages);
>> }
>>
>> static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
>> @@ -4107,7 +4106,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
>> */
>> memcg_check_events(memcg, page);
>> if (do_swap_account && ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) {
>> - mem_cgroup_swap_statistics(memcg, true);
>> + mem_cgroup_swap_statistics(memcg, nr_pages);
>> mem_cgroup_get(memcg);
>> }
>> /*
>> @@ -4238,7 +4237,7 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent)
>> */
>> if (!mem_cgroup_is_root(memcg))
>> res_counter_uncharge(&memcg->memsw, PAGE_SIZE);
>> - mem_cgroup_swap_statistics(memcg, false);
>> + mem_cgroup_swap_statistics(memcg, -1);
>> mem_cgroup_put(memcg);
>> }
>> rcu_read_unlock();
>> @@ -4267,8 +4266,8 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry,
>> new_id = css_id(&to->css);
>>
>> if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
>> - mem_cgroup_swap_statistics(from, false);
>> - mem_cgroup_swap_statistics(to, true);
>> + mem_cgroup_swap_statistics(from, -1);
>> + mem_cgroup_swap_statistics(to, 1);
>> /*
>> * This function is only called from task migration context now.
>> * It postpones res_counter and refcount handling till the end
>> --
>> 1.7.9.5
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>
> --
> Michal Hocko
> SUSE Labs
--
Thanks,
Sha
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-01-10 13:39 ` Michal Hocko
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