Re: [PATCH v1 2/2] mm: vmscan: ignore non-LRU-based reclaim in memcg reclaim

From: Yosry Ahmed <yosryahmed@google.com>
To: kernel test robot <lkp@intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	"Darrick J. Wong" <djwong@kernel.org>,
	 Christoph Lameter <cl@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	 Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	 Roman Gushchin <roman.gushchin@linux.dev>,
	Hyeonggon Yoo <42.hyeyoo@gmail.com>,
	 "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Miaohe Lin <linmiaohe@huawei.com>,
	 David Hildenbrand <david@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Peter Xu <peterx@redhat.com>,  NeilBrown <neilb@suse.de>,
	Shakeel Butt <shakeelb@google.com>,
	Michal Hocko <mhocko@kernel.org>,
	 llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	 linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-xfs@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v1 2/2] mm: vmscan: ignore non-LRU-based reclaim in memcg reclaim
Date: Tue, 28 Feb 2023 09:18:19 -0800	[thread overview]
Message-ID: <CAJD7tkZxwuR6JoVo9RnepXA3Kg7HVMLyzTfTdRvLg27OihECiw@mail.gmail.com> (raw)
In-Reply-To: <202302281933.vU1PHuZr-lkp@intel.com>

On Tue, Feb 28, 2023 at 3:56 AM kernel test robot <lkp@intel.com> wrote:
>
> Hi Yosry,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on akpm-mm/mm-everything]
> [also build test ERROR on linus/master next-20230228]
> [cannot apply to vbabka-slab/for-next xfs-linux/for-next v6.2]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Yosry-Ahmed/mm-vmscan-refactor-updating-reclaimed-pages-in-reclaim_state/20230228-165214
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20230228085002.2592473-3-yosryahmed%40google.com
> patch subject: [PATCH v1 2/2] mm: vmscan: ignore non-LRU-based reclaim in memcg reclaim
> config: i386-randconfig-a002-20230227 (https://download.01.org/0day-ci/archive/20230228/202302281933.vU1PHuZr-lkp@intel.com/config)
> compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/f6d2b849f186a927925a29e289d60895048550f5
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Yosry-Ahmed/mm-vmscan-refactor-updating-reclaimed-pages-in-reclaim_state/20230228-165214
>         git checkout f6d2b849f186a927925a29e289d60895048550f5
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202302281933.vU1PHuZr-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> mm/vmscan.c:549:13: error: redefinition of 'cgroup_reclaim'
>    static bool cgroup_reclaim(struct scan_control *sc)
>                ^
>    mm/vmscan.c:191:13: note: previous definition is here
>    static bool cgroup_reclaim(struct scan_control *sc)
>                ^
> >> mm/vmscan.c:554:13: error: redefinition of 'global_reclaim'
>    static bool global_reclaim(struct scan_control *sc)
>                ^
>    mm/vmscan.c:196:13: note: previous definition is here
>    static bool global_reclaim(struct scan_control *sc)
>                ^
>    2 errors generated.

Ugh yeah I didn't realize I am moving the definitions from within an
#ifdef CONFIG_MEMCG. I will just leave the definitions as-is and add a
forward declaration before the definition of
add_non_vmscan_reclaimed(), should also reduce the churn in the diff.
Will wait for a bit before re-spinning to gather some feedback on the
current version first.

>
>
> vim +/cgroup_reclaim +549 mm/vmscan.c
>
> 86750830468506 Yang Shi        2021-05-04  548
> b5ead35e7e1d34 Johannes Weiner 2019-11-30 @549  static bool cgroup_reclaim(struct scan_control *sc)
> 89b5fae5368f6a Johannes Weiner 2012-01-12  550  {
> b5ead35e7e1d34 Johannes Weiner 2019-11-30  551          return false;
> 89b5fae5368f6a Johannes Weiner 2012-01-12  552  }
> 97c9341f727105 Tejun Heo       2015-05-22  553
> a579086c99ed70 Yu Zhao         2022-12-21 @554  static bool global_reclaim(struct scan_control *sc)
> a579086c99ed70 Yu Zhao         2022-12-21  555  {
> a579086c99ed70 Yu Zhao         2022-12-21  556          return true;
> a579086c99ed70 Yu Zhao         2022-12-21  557  }
> a579086c99ed70 Yu Zhao         2022-12-21  558
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests