Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress

[kernel test robot <lkp@intel.com>]

Hi Mel,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hnaz-mm/master]

url:    https://github.com/0day-ci/linux/commits/Mel-Gorman/mm-vmscan-Reduce-throttling-due-to-a-failure-to-make-progress/20211202-212004
base:   https://github.com/hnaz/linux-mm master
config: x86_64-buildonly-randconfig-r001-20211202 (https://download.01.org/0day-ci/archive/20211203/202112030001.HUiErCyK-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4b553297ef3ee4dc2119d5429adf3072e90fac38)
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/0day-ci/linux/commit/01dada07590ae9c69a9415ba9af96d5ae184d861
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mel-Gorman/mm-vmscan-Reduce-throttling-due-to-a-failure-to-make-progress/20211202-212004
        git checkout 01dada07590ae9c69a9415ba9af96d5ae184d861
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> mm/vmscan.c:1024:6: warning: no previous prototype for function 'skip_throttle_noprogress' [-Wmissing-prototypes]
   bool skip_throttle_noprogress(pg_data_t *pgdat)
        ^
   mm/vmscan.c:1024:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool skip_throttle_noprogress(pg_data_t *pgdat)
   ^
   static 
   1 warning generated.


vim +/skip_throttle_noprogress +1024 mm/vmscan.c

  1023	
> 1024	bool skip_throttle_noprogress(pg_data_t *pgdat)
  1025	{
  1026		int reclaimable = 0, write_pending = 0;
  1027		int i;
  1028	
  1029		/*
  1030		 * If kswapd is disabled, reschedule if necessary but do not
  1031		 * throttle as the system is likely near OOM.
  1032		 */
  1033		if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES)
  1034			return true;
  1035	
  1036		/*
  1037		 * If there are a lot of dirty/writeback pages then do not
  1038		 * throttle as throttling will occur when the pages cycle
  1039		 * towards the end of the LRU if still under writeback.
  1040		 */
  1041		for (i = 0; i < MAX_NR_ZONES; i++) {
  1042			struct zone *zone = pgdat->node_zones + i;
  1043	
  1044			if (!populated_zone(zone))
  1045				continue;
  1046	
  1047			reclaimable += zone_reclaimable_pages(zone);
  1048			write_pending += zone_page_state_snapshot(zone,
  1049							  NR_ZONE_WRITE_PENDING);
  1050		}
  1051		if (2 * write_pending <= reclaimable)
  1052			return true;
  1053	
  1054		return false;
  1055	}
  1056	

---
0-DAY CI Kernel Test Service, Intel Corporation
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