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

[Yosry Ahmed <yosryahmed@google.com>]

On Tue, Feb 28, 2023 at 9:18 AM Yosry Ahmed <yosryahmed@google.com> wrote:
>
> 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.

I can also just move all the reclaim state functions
(set_task_reclaim_state(), report_freed_pages(),
add_non_vmscan_reclaimed()) below that #ifdef CONFIG_MEMCG.
Might also name them more consistently.


>
> >
> >
> > 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