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Message-ID: <SG2PR02MB3098361719B67448CB6FF28CE8470@SG2PR02MB3098.apcprd02.prod.outlook.com>
Date: Mon, 18 Mar 2019 07:45:22 +0000
From: Pankaj Suryawanshi <pankaj.suryawanshi@...fochips.com>
To: Kirill Tkhai <ktkhai@...tuozzo.com>,
Michal Hocko <mhocko@...nel.org>,
"aneesh.kumar@...ux.ibm.com" <aneesh.kumar@...ux.ibm.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"minchan@...nel.org" <minchan@...nel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"khandual@...ux.vnet.ibm.com" <khandual@...ux.vnet.ibm.com>,
"vbabka@...e.cz" <vbabka@...e.cz>
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
It fixes the below issue.
1. Large size buffer allocation using cma_alloc successful with unevictable pages.
cma_alloc of current kernel will fail due to unevictable pages.
Solved the below issue of cma_alloc
-----------------------------------------------------------------------------------------------------------------------------------------
[ 24.718792] page dumped because: VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page))
[ 24.726949] page->mem_cgroup:bd008c00
[ 24.730693] ------------[ cut here ]------------
[ 24.735304] kernel BUG at mm/vmscan.c:1350!
[ 24.739478] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
-----------------------------------------------------------------------------------------------------------------------------------------
From: Pankaj Suryawanshi
Sent: 15 March 2019 15:41:57
To: Kirill Tkhai; Michal Hocko; aneesh.kumar@...ux.ibm.com
Cc: linux-kernel@...r.kernel.org; minchan@...nel.org; linux-mm@...ck.org; khandual@...ux.vnet.ibm.com; hillf.zj@...baba-inc.com; vbabka@...e.cz
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
[ cc Aneesh kumar, Anshuman, Hillf, Vlastimil]
From: Pankaj Suryawanshi
Sent: 15 March 2019 11:35:05
To: Kirill Tkhai; Michal Hocko
Cc: linux-kernel@...r.kernel.org; minchan@...nel.org; linux-mm@...ck.org
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
[ cc linux-mm ]
From: Pankaj Suryawanshi
Sent: 14 March 2019 19:14:40
To: Kirill Tkhai; Michal Hocko
Cc: linux-kernel@...r.kernel.org; minchan@...nel.org
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
Hello ,
Please ignore the curly braces, they are just for debugging.
Below is the updated patch.
diff --git a/mm/vmscan.c b/mm/vmscan.c
index be56e2e..12ac353 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -998,7 +998,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
sc->nr_scanned++;
if (unlikely(!page_evictable(page)))
- goto activate_locked;
+ goto cull_mlocked;
if (!sc->may_unmap && page_mapped(page))
goto keep_locked;
@@ -1331,7 +1331,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
} else
list_add(&page->lru, &free_pages);
continue;
-
+cull_mlocked:
+ if (PageSwapCache(page))
+ try_to_free_swap(page);
+ unlock_page(page);
+ list_add(&page->lru, &ret_pages);
+ continue;
activate_locked:
/* Not a candidate for swapping, so reclaim swap space. */
if (PageSwapCache(page) && (mem_cgroup_swap_full(page) ||
Regards,
Pankaj
From: Kirill Tkhai <ktkhai@...tuozzo.com>
Sent: 14 March 2019 14:55:34
To: Pankaj Suryawanshi; Michal Hocko
Cc: linux-kernel@...r.kernel.org; minchan@...nel.org
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
On 14.03.2019 11:52, Pankaj Suryawanshi wrote:
>
> I am using kernel version 4.14.65 (on Android pie [ARM]).
>
> No additional patches applied on top of vanilla.(Core MM).
>
> If I change in the vmscan.c as below patch, it will work.
Sorry, but 4.14.65 does not have braces around trylock_page(),
like in your patch below.
See https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/mm/vmscan.c?h=v4.14.65
[...]
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index be56e2e..2e51edc 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -990,15 +990,17 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>> page = lru_to_page(page_list);
>> list_del(&page->lru);
>>
>> if (!trylock_page(page)) {
>> goto keep;
>> }
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