linux-kernel - Re: [PATCH] mm/damon: simplify scheme create in damon_lru_sort_apply

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Date:   Sun, 11 Sep 2022 03:16:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Xin Hao <xhao@...ux.alibaba.com>, sj@...nel.org
Cc:     kbuild-all@...ts.01.org, akpm@...ux-foundation.org,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, xhao@...ux.alibaba.com
Subject: Re: [PATCH] mm/damon: simplify scheme create in
 damon_lru_sort_apply_parameters

Hi Xin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Xin-Hao/mm-damon-simplify-scheme-create-in-damon_lru_sort_apply_parameters/20220911-005630
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: x86_64-allyesconfig
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/d9938ea4d14a88832eee655cda52401891778dd5
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Xin-Hao/mm-damon-simplify-scheme-create-in-damon_lru_sort_apply_parameters/20220911-005630
        git checkout d9938ea4d14a88832eee655cda52401891778dd5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash mm/damon/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   mm/damon/lru_sort.c: In function 'damon_lru_sort_apply_parameters':
>> mm/damon/lru_sort.c:353:32: warning: unused variable 'next_scheme' [-Wunused-variable]
     353 |         struct damos *scheme, *next_scheme;
         |                                ^~~~~~~~~~~


vim +/next_scheme +353 mm/damon/lru_sort.c

40e983cca9274e SeongJae Park 2022-06-13  350  
40e983cca9274e SeongJae Park 2022-06-13  351  static int damon_lru_sort_apply_parameters(void)
40e983cca9274e SeongJae Park 2022-06-13  352  {
40e983cca9274e SeongJae Park 2022-06-13 @353  	struct damos *scheme, *next_scheme;
40e983cca9274e SeongJae Park 2022-06-13  354  	struct damon_addr_range addr_range;
40e983cca9274e SeongJae Park 2022-06-13  355  	unsigned int hot_thres, cold_thres;
40e983cca9274e SeongJae Park 2022-06-13  356  	int err = 0;
40e983cca9274e SeongJae Park 2022-06-13  357  
40e983cca9274e SeongJae Park 2022-06-13  358  	err = damon_set_attrs(ctx, sample_interval, aggr_interval, 0,
40e983cca9274e SeongJae Park 2022-06-13  359  			min_nr_regions, max_nr_regions);
40e983cca9274e SeongJae Park 2022-06-13  360  	if (err)
40e983cca9274e SeongJae Park 2022-06-13  361  		return err;
40e983cca9274e SeongJae Park 2022-06-13  362  
40e983cca9274e SeongJae Park 2022-06-13  363  	/* aggr_interval / sample_interval is the maximum nr_accesses */
40e983cca9274e SeongJae Park 2022-06-13  364  	hot_thres = aggr_interval / sample_interval * hot_thres_access_freq /
40e983cca9274e SeongJae Park 2022-06-13  365  		1000;
40e983cca9274e SeongJae Park 2022-06-13  366  	scheme = damon_lru_sort_new_hot_scheme(hot_thres);
40e983cca9274e SeongJae Park 2022-06-13  367  	if (!scheme)
40e983cca9274e SeongJae Park 2022-06-13  368  		return -ENOMEM;
d9938ea4d14a88 Xin Hao       2022-09-11  369  	err = damon_set_schemes(ctx, &scheme, 1);
d9938ea4d14a88 Xin Hao       2022-09-11  370  	if (err)
d9938ea4d14a88 Xin Hao       2022-09-11  371  		return err;
40e983cca9274e SeongJae Park 2022-06-13  372  
40e983cca9274e SeongJae Park 2022-06-13  373  	cold_thres = cold_min_age / aggr_interval;
40e983cca9274e SeongJae Park 2022-06-13  374  	scheme = damon_lru_sort_new_cold_scheme(cold_thres);
40e983cca9274e SeongJae Park 2022-06-13  375  	if (!scheme)
40e983cca9274e SeongJae Park 2022-06-13  376  		return -ENOMEM;
40e983cca9274e SeongJae Park 2022-06-13  377  	damon_add_scheme(ctx, scheme);
40e983cca9274e SeongJae Park 2022-06-13  378  
40e983cca9274e SeongJae Park 2022-06-13  379  	if (monitor_region_start > monitor_region_end)
40e983cca9274e SeongJae Park 2022-06-13  380  		return -EINVAL;
40e983cca9274e SeongJae Park 2022-06-13  381  	if (!monitor_region_start && !monitor_region_end &&
dd7ecfcf662cdf Xin Hao       2022-09-09  382  	    !damon_find_biggest_system_ram(&monitor_region_start,
40e983cca9274e SeongJae Park 2022-06-13  383  					   &monitor_region_end))
40e983cca9274e SeongJae Park 2022-06-13  384  		return -EINVAL;
40e983cca9274e SeongJae Park 2022-06-13  385  	addr_range.start = monitor_region_start;
40e983cca9274e SeongJae Park 2022-06-13  386  	addr_range.end = monitor_region_end;
40e983cca9274e SeongJae Park 2022-06-13  387  	return damon_set_regions(target, &addr_range, 1);
40e983cca9274e SeongJae Park 2022-06-13  388  }
40e983cca9274e SeongJae Park 2022-06-13  389  

-- 
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https://01.org/lkp

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