Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Pankaj Suryawanshi <pankaj.suryawanshi@einfochips.com>
To:     Kirill Tkhai <ktkhai@virtuozzo.com>,
        Michal Hocko <mhocko@kernel.org>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "minchan@kernel.org" <minchan@kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
Thread-Topic: Re: [External] Re: vmscan: Reclaim unevictable pages
Thread-Index: AQHU2jnLyCfGly2dbEuVu40O8aA4saYKwYIOgAACnP2AAArTAIAAAt0egAAJfgCAABwNcoAAK5EogAESNQY=
Date:   Fri, 15 Mar 2019 06:05:05 +0000
Message-ID: <SG2PR02MB3098AB587F4BFCD6B9D042FDE8440@SG2PR02MB3098.apcprd02.prod.outlook.com>
References: <SG2PR02MB3098A05E09B0D3F3CB1C3B9BE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>
 <SG2PR02MB309806967AE91179CAFEC34BE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>
 <SG2PR02MB3098B751EC6B8E32806A42FBE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>
 <20190314084120.GF7473@dhcp22.suse.cz>
 <SG2PR02MB309894F6D7DF9148846088F3E84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>,<226a92b9-94c5-b859-c54b-3aacad3089cc@virtuozzo.com>,<SG2PR02MB3098299456FB6AE2FD822C4CE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>,<SG2PR02MB30988333AD658F8124070ABEE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>
In-Reply-To: <SG2PR02MB30988333AD658F8124070ABEE84B0@SG2PR02MB3098.apcprd02.prod.outlook.com>
Accept-Language: en-GB, en-US
Content-Language: en-GB
received-spf: None (protection.outlook.com: einfochips.com does not designate
 permitted sender hosts)
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: 854f0f83-831c-480a-ca60-08d6a90c2c03
X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Mar 2019 06:05:05.9118
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 0adb040b-ca22-4ca6-9447-ab7b049a22ff
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SG2PR02MB4217
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


[ cc linux-mm ]


From: Pankaj Suryawanshi
Sent: 14 March 2019 19:14:40
To: Kirill Tkhai; Michal Hocko
Cc: linux-kernel@vger.kernel.org; minchan@kernel.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_he=
ad *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@virtuozzo.com>
Sent: 14 March 2019 14:55:34
To: Pankaj Suryawanshi; Michal Hocko
Cc: linux-kernel@vger.kernel.org; minchan@kernel.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/tre=
e/mm/vmscan.c?h=3Dv4.14.65

[...]

>> 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 =3D lru_to_page(page_list);
>>                  list_del(&page->lru);
>>
>>                 if (!trylock_page(page)) {
>>                          goto keep;
>>                 }

***************************************************************************=
***************************************************************************=
******* eInfochips Business Disclaimer: This e-mail message and all attachm=
ents transmitted with it are intended solely for the use of the addressee a=
nd may contain legally privileged and confidential information. If the read=
er of this message is not the intended recipient, or an employee or agent r=
esponsible for delivering this message to the intended recipient, you are h=
ereby notified that any dissemination, distribution, copying, or other use =
of this message or its attachments is strictly prohibited. If you have rece=
ived this message in error, please notify the sender immediately by replyin=
g to this message and please delete it from your computer. Any views expres=
sed in this message are those of the individual sender unless otherwise sta=
ted. Company has taken enough precautions to prevent the spread of viruses.=
 However the company accepts no liability for any damage caused by any viru=
s transmitted by this email. **********************************************=
***************************************************************************=
************************************