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dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf07.hostedemail.com: domain of xhao@linux.alibaba.com designates 115.124.30.132 as permitted sender) smtp.mailfrom=xhao@linux.alibaba.com X-Rspamd-Server: rspam02 X-HE-Tag: 1663250622-531453 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 在 2022/9/15 下午9:25, SeongJae Park 写道: > Hi Xin, > > On Thu, 15 Sep 2022 10:36:55 +0800 Xin Hao wrote: > >> In damon_lru_sort_new_hot_scheme() and damon_lru_sort_new_cold_scheme(), >> they have so much in common, so we can combine them into a single >> function, and we just need to distinguish their differences. >> >> Suggested-by: SeongJae Park >> Signed-off-by: Xin Hao >> Changes from v2 >> (https://lore.kernel.org/linux-mm/20220914113859.37637-1-xhao@linux.alibaba.com/) >> - Add static global 'struct damos_access_pattern' stub variable > Chagelog should not be in the commit message area, > >> --- > but here. > >> mm/damon/lru_sort.c | 41 +++++++++++++++++++---------------------- >> 1 file changed, 19 insertions(+), 22 deletions(-) >> >> diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c >> index 07a0908963fd..6a26c5822286 100644 >> --- a/mm/damon/lru_sort.c >> +++ b/mm/damon/lru_sort.c >> @@ -132,6 +132,18 @@ DEFINE_DAMON_MODULES_DAMOS_STATS_PARAMS(damon_lru_sort_cold_stat, >> lru_sort_tried_cold_regions, lru_sorted_cold_regions, >> cold_quota_exceeds); >> >> +struct damos_access_pattern damon_lru_sort_stub_access_pattern = { >> + /* Find regions having PAGE_SIZE or larger size */ >> + .min_sz_region = PAGE_SIZE, >> + .max_sz_region = ULONG_MAX, >> + /* and accessed for more than the threshold */ > This comment looks inappropriate. How about 'no matter its access frequency'? > >> + .min_nr_accesses = 0, >> + .max_nr_accesses = UINT_MAX, >> + /* no matter its age */ >> + .min_age_region = 0, >> + .max_age_region = UINT_MAX, >> +}; >> + >> static struct damon_ctx *ctx; >> static struct damon_target *target; >> >> @@ -157,17 +169,9 @@ static struct damos *damon_lru_sort_new_scheme( >> /* Create a DAMON-based operation scheme for hot memory regions */ >> static struct damos *damon_lru_sort_new_hot_scheme(unsigned int hot_thres) >> { >> - struct damos_access_pattern pattern = { >> - /* Find regions having PAGE_SIZE or larger size */ >> - .min_sz_region = PAGE_SIZE, >> - .max_sz_region = ULONG_MAX, >> - /* and accessed for more than the threshold */ >> - .min_nr_accesses = hot_thres, >> - .max_nr_accesses = UINT_MAX, >> - /* no matter its age */ >> - .min_age_region = 0, >> - .max_age_region = UINT_MAX, >> - }; >> + struct damos_access_pattern pattern = damon_lru_sort_stub_access_pattern; > More than 80 columns. Renaming stub_access_pattern into stub_pattern might > make sense. > >> + >> + pattern.min_nr_accesses = hot_thres; >> >> return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_PRIO); >> } >> @@ -175,17 +179,10 @@ static struct damos *damon_lru_sort_new_hot_scheme(unsigned int hot_thres) >> /* Create a DAMON-based operation scheme for cold memory regions */ >> static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres) >> { >> - struct damos_access_pattern pattern = { >> - /* Find regions having PAGE_SIZE or larger size */ >> - .min_sz_region = PAGE_SIZE, >> - .max_sz_region = ULONG_MAX, >> - /* and not accessed at all */ >> - .min_nr_accesses = 0, >> - .max_nr_accesses = 0, >> - /* for min_age or more micro-seconds */ >> - .min_age_region = cold_thres, >> - .max_age_region = UINT_MAX, >> - }; >> + struct damos_access_pattern pattern = damon_lru_sort_stub_access_pattern; > More than 80 columns. > >> + >> + pattern.max_nr_accesses = 0; >> + pattern.min_age_region = cold_thres; >> >> return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO); >> } >> -- >> 2.31.0 > Other than the trivial things, look good. As my comments are only for trivial > cosmetic things, I will make the change and post v4 on my own. Ok,  thank you very much for such a detailed review. > > Thanks, > SJ