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Date: Sun, 2 Aug 2020 18:24:56 +0530 From: Charan Teja Reddy <charante@...eaurora.org> To: akpm@...ux-foundation.org, linux-mm@...ck.org Cc: linux-kernel@...r.kernel.org, vinmenon@...eaurora.org, Charan Teja Reddy <charante@...eaurora.org> Subject: [PATCH] mm, memory_hotplug: update pcp lists everytime onlining a memory block When onlining a first memory block in a zone, pcp lists are not updated thus pcp struct will have the default setting of ->high = 0,->batch = 1. This means till the second memory block in a zone(if it have) is onlined the pcp lists of this zone will not contain any pages because pcp's ->count is always greater than ->high thus free_pcppages_bulk() is called to free batch size(=1) pages every time system wants to add a page to the pcp list through free_unref_page(). To put this in a word, system is not using benefits offered by the pcp lists when there is a single onlineable memory block in a zone. Correct this by always updating the pcp lists when memory block is onlined. Signed-off-by: Charan Teja Reddy <charante@...eaurora.org> --- mm/memory_hotplug.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index dcdf327..7f62d69 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -854,8 +854,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, node_states_set_node(nid, &arg); if (need_zonelists_rebuild) build_all_zonelists(NULL); - else - zone_pcp_update(zone); + zone_pcp_update(zone); init_per_zone_wmark_min(); -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation
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