linux-kernel - [PATCH v3 2/7] mm/lruvec: add irqsave flags into lruvec struct

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Date:   Sat, 16 Nov 2019 11:15:01 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     alex.shi@...ux.alibaba.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, yang.shi@...ux.alibaba.com,
        willy@...radead.org
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Arun KS <arunks@...eaurora.org>,
        Rong Chen <rong.a.chen@...el.com>
Subject: [PATCH v3 2/7] mm/lruvec: add irqsave flags into lruvec struct

We need a irqflags vaiable to save state when do irqsave action, declare
it here would make code more clear/clean.

Rong Chen <rong.a.chen@...el.com> reported the 'irqflags' variable need
move to the tail of lruvec struct otherwise it causes 18% regressions of
vm-scalability testing on his machine. So add the flags and lru_lock to
both near struct tail, even I have no clue of this perf losing.

Originally-from: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Wei Yang <richard.weiyang@...il.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Arun KS <arunks@...eaurora.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
CC: Rong Chen <rong.a.chen@...el.com>
Cc: cgroups@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 include/linux/mmzone.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a13b8a602ee5..9b8b8daf4e03 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -269,6 +269,8 @@ struct lruvec {
 	unsigned long			flags;
 	/* per lruvec lru_lock for memcg */
 	spinlock_t			lru_lock;
+	/* flags for irqsave */
+	unsigned long			irqflags;
 #ifdef CONFIG_MEMCG
 	struct pglist_data *pgdat;
 #endif
-- 
1.8.3.1