linux-kernel - [PATCH v4 0/3] mm: improve zone->lock scalability

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Message-Id: <20180301062845.26038-1-aaron.lu@intel.com>
Date:   Thu,  1 Mar 2018 14:28:42 +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>,
        Huang Ying <ying.huang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kemi Wang <kemi.wang@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>
Subject: [PATCH v4 0/3] mm: improve zone->lock scalability

Patch 1/3 is a small cleanup suggested by Matthew Wilcox which doesn't
affect scalability or performance;
Patch 2/3 moves some code in free_pcppages_bulk() outside of zone->lock
and has Mel Gorman's ack;
Patch 3/3 uses prefetch in free_pcppages_bulk() outside of zone->lock to
speedup page merging under zone->lock but Mel Gorman has some concerns.

For details, please see their changelogs.

v4:
Address David Rientjes' comments to not update pcp->count in front of
free_pcppages_bulk() in patch 1/3.
Reword code comments in patch 2/3 as suggested by David Rientjes.

v3:
Added patch 1/3 to update pcp->count inside of free_pcppages_bulk();
Rebase to v4.16-rc2.

v2 & v1:
https://lkml.org/lkml/2018/1/23/879

Aaron Lu (3):
  mm/free_pcppages_bulk: update pcp->count inside
  mm/free_pcppages_bulk: do not hold lock when picking pages to free
  mm/free_pcppages_bulk: prefetch buddy while not holding lock

 mm/page_alloc.c | 62 +++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 40 insertions(+), 22 deletions(-)

-- 
2.14.3