linux-kernel - [RFC PATCH 1/9] mm: do not add anon pages to LRU

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Date:   Tue, 11 Sep 2018 13:36:08 +0800
From:   Aaron Lu <aaron.lu@...el.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Yosef Lev <levyossi@...oud.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [RFC PATCH 1/9] mm: do not add anon pages to LRU

For the sake of testing purpose, do not add anon pages to LRU to
avoid LRU lock so we can test zone lock exclusively.

Signed-off-by: Aaron Lu <aaron.lu@...el.com>
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index c467102a5cbc..080641255b8b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3208,7 +3208,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 	inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
 	page_add_new_anon_rmap(page, vma, vmf->address, false);
 	mem_cgroup_commit_charge(page, memcg, false, false);
-	lru_cache_add_active_or_unevictable(page, vma);
+	//lru_cache_add_active_or_unevictable(page, vma);
 setpte:
 	set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry);
 
-- 
2.17.1