From 1eb6234e52f0cbb87f59c328687127866d57941a Mon Sep 17 00:00:00 2001 From: Yang Shi Date: Wed, 1 Apr 2020 21:06:20 -0700 Subject: mm: swap: make page_evictable() inline When backporting commit 9c4e6b1a7027 ("mm, mlock, vmscan: no more skipping pagevecs") to our 4.9 kernel, our test bench noticed around 10% down with a couple of vm-scalability's test cases (lru-file-readonce, lru-file-readtwice and lru-file-mmap-read). I didn't see that much down on my VM (32c-64g-2nodes). It might be caused by the test configuration, which is 32c-256g with NUMA disabled and the tests were run in root memcg, so the tests actually stress only one inactive and active lru. It sounds not very usual in mordern production environment. That commit did two major changes: 1. Call page_evictable() 2. Use smp_mb to force the PG_lru set visible It looks they contribute the most overhead. The page_evictable() is a function which does function prologue and epilogue, and that was used by page reclaim path only. However, lru add is a very hot path, so it sounds better to make it inline. However, it calls page_mapping() which is not inlined either, but the disassemble shows it doesn't do push and pop operations and it sounds not very straightforward to inline it. Other than this, it sounds smp_mb() is not necessary for x86 since SetPageLRU is atomic which enforces memory barrier already, replace it with smp_mb__after_atomic() in the following patch. With the two fixes applied, the tests can get back around 5% on that test bench and get back normal on my VM. Since the test bench configuration is not that usual and I also saw around 6% up on the latest upstream, so it sounds good enough IMHO. The below is test data (lru-file-readtwice throughput) against the v5.6-rc4: mainline w/ inline fix 150MB 154MB With this patch the throughput gets 2.67% up. The data with using smp_mb__after_atomic() is showed in the following patch. Shakeel Butt did the below test: On a real machine with limiting the 'dd' on a single node and reading 100 GiB sparse file (less than a single node). Just ran a single instance to not cause the lru lock contention. The cmdline used is "dd if=file-100GiB of=/dev/null bs=4k". Ran the cmd 10 times with drop_caches in between and measured the time it took. Without patch: 56.64143 +- 0.672 sec With patches: 56.10 +- 0.21 sec [akpm@linux-foundation.org: move page_evictable() to internal.h] Fixes: 9c4e6b1a7027 ("mm, mlock, vmscan: no more skipping pagevecs") Signed-off-by: Yang Shi Signed-off-by: Andrew Morton Tested-by: Shakeel Butt Reviewed-by: Shakeel Butt Reviewed-by: Matthew Wilcox (Oracle) Acked-by: Vlastimil Babka Acked-by: Johannes Weiner Link: http://lkml.kernel.org/r/1584500541-46817-1-git-send-email-yang.shi@linux.alibaba.com Signed-off-by: Linus Torvalds --- include/linux/pagemap.h | 6 ++---- include/linux/swap.h | 1 - 2 files changed, 2 insertions(+), 5 deletions(-) (limited to 'include') diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 5b0e6343229d..b82eabf0268e 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -70,11 +70,9 @@ static inline void mapping_clear_unevictable(struct address_space *mapping) clear_bit(AS_UNEVICTABLE, &mapping->flags); } -static inline int mapping_unevictable(struct address_space *mapping) +static inline bool mapping_unevictable(struct address_space *mapping) { - if (mapping) - return test_bit(AS_UNEVICTABLE, &mapping->flags); - return !!mapping; + return mapping && test_bit(AS_UNEVICTABLE, &mapping->flags); } static inline void mapping_set_exiting(struct address_space *mapping) diff --git a/include/linux/swap.h b/include/linux/swap.h index 1e99f7ac1d7e..b835d8dbea0e 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -374,7 +374,6 @@ extern int sysctl_min_slab_ratio; #define node_reclaim_mode 0 #endif -extern int page_evictable(struct page *page); extern void check_move_unevictable_pages(struct pagevec *pvec); extern int kswapd_run(int nid); -- cgit v1.2.3