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Date:   Wed,  6 May 2020 17:42:05 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        rppt@...ux.ibm.com, akpm@...ux-foundation.org, hughd@...gle.com,
        ebiederm@...ssion.com, masahiroy@...nel.org, ardb@...nel.org,
        ndesaulniers@...gle.com, dima@...ovin.in, daniel.kiper@...cle.com,
        nivedita@...m.mit.edu, rafael.j.wysocki@...el.com,
        dan.j.williams@...el.com, zhenzhong.duan@...cle.com,
        jroedel@...e.de, bhe@...hat.com, guro@...com,
        Thomas.Lendacky@....com, andriy.shevchenko@...ux.intel.com,
        keescook@...omium.org, hannes@...xchg.org, minchan@...nel.org,
        mhocko@...nel.org, ying.huang@...el.com,
        yang.shi@...ux.alibaba.com, gustavo@...eddedor.com,
        ziqian.lzq@...fin.com, vdavydov.dev@...il.com,
        jason.zeng@...el.com, kevin.tian@...el.com, zhiyuan.lv@...el.com,
        lei.l.li@...el.com, paul.c.lai@...el.com, ashok.raj@...el.com,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        kexec@...ts.infradead.org
Subject: [RFC 39/43] shmem: optimize adding pages to the LRU in shmem_insert_pages()

Reduce LRU lock contention when inserting shmem pages by staging pages
to be added to the same LRU and adding them en masse.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 mm/shmem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index ca5edf580f24..678a396ba8d3 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -789,9 +789,12 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index,
 	struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
 	gfp_t gfp = mapping_gfp_mask(mapping);
 	struct mem_cgroup *memcg;
+	struct lru_splice splice;
 	int i, err;
 	int nr = 0;
 
+	memset(&splice, 0, sizeof(splice));
+
 	for (i = 0; i < npages; i++)
 		nr += compound_nr(pages[i]);
 
@@ -866,7 +869,7 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index,
 		}
 
 		if (!PageLRU(pages[i]))
-			lru_cache_add_anon(pages[i]);
+			lru_splice_add_anon(pages[i], &splice);
 
 		flush_dcache_page(pages[i]);
 		SetPageUptodate(pages[i]);
@@ -875,6 +878,9 @@ int shmem_insert_pages(struct mm_struct *mm, struct inode *inode, pgoff_t index,
 		unlock_page(pages[i]);
 	}
 
+	if (splice.pgdat)
+		add_splice_to_lru_list(&splice);
+
 	return 0;
 
 out_truncate:
-- 
2.13.3

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