linux-kernel - Re: [PATCH] Add the memcg print oom info for system oom

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Date:   Sun, 20 May 2018 05:18:39 +0800
From:   kbuild test robot <lkp@...el.com>
To:     ufo19890607 <ufo19890607@...il.com>
Cc:     kbuild-all@...org, akpm@...ux-foundation.org, mhocko@...e.com,
        rientjes@...gle.com, kirill.shutemov@...ux.intel.com,
        aarcange@...hat.com, penguin-kernel@...ove.SAKURA.ne.jp,
        guro@...com, yang.s@...baba-inc.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        yuzhoujian <yuzhoujian@...ichuxing.com>
Subject: Re: [PATCH] Add the memcg print oom info for system oom

Hi yuzhoujian,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.17-rc5 next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/ufo19890607/Add-the-memcg-print-oom-info-for-system-oom/20180520-041924
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-x003-201820 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   mm/oom_kill.c: In function 'dump_header':
>> mm/oom_kill.c:436:29: error: implicit declaration of function 'mem_cgroup_from_task'; did you mean 'mem_cgroup_from_id'? [-Werror=implicit-function-declaration]
      mem_cgroup_print_oom_info(mem_cgroup_from_task(p), p);
                                ^~~~~~~~~~~~~~~~~~~~
                                mem_cgroup_from_id
>> mm/oom_kill.c:436:29: warning: passing argument 1 of 'mem_cgroup_print_oom_info' makes pointer from integer without a cast [-Wint-conversion]
   In file included from include/linux/swap.h:9:0,
                    from mm/oom_kill.c:28:
   include/linux/memcontrol.h:932:1: note: expected 'struct mem_cgroup *' but argument is of type 'int'
    mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
    ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +436 mm/oom_kill.c

   421	
   422	static void dump_header(struct oom_control *oc, struct task_struct *p)
   423	{
   424		pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), nodemask=%*pbl, order=%d, oom_score_adj=%hd\n",
   425			current->comm, oc->gfp_mask, &oc->gfp_mask,
   426			nodemask_pr_args(oc->nodemask), oc->order,
   427				current->signal->oom_score_adj);
   428		if (!IS_ENABLED(CONFIG_COMPACTION) && oc->order)
   429			pr_warn("COMPACTION is disabled!!!\n");
   430	
   431		cpuset_print_current_mems_allowed();
   432		dump_stack();
   433		if (is_memcg_oom(oc))
   434			mem_cgroup_print_oom_info(oc->memcg, p);
   435		else {
 > 436			mem_cgroup_print_oom_info(mem_cgroup_from_task(p), p);
   437			show_mem(SHOW_MEM_FILTER_NODES, oc->nodemask);
   438			if (is_dump_unreclaim_slabs())
   439				dump_unreclaimable_slab();
   440		}
   441		if (sysctl_oom_dump_tasks)
   442			dump_tasks(oc->memcg, oc->nodemask);
   443	}
   444	

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