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Date: Mon, 18 Sep 2017 11:07:20 +0800 From: kemi <kemi.wang@...el.com> To: Michal Hocko <mhocko@...nel.org> Cc: "Luis R . Rodriguez" <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, Jonathan Corbet <corbet@....net>, Mel Gorman <mgorman@...hsingularity.net>, Johannes Weiner <hannes@...xchg.org>, Christopher Lameter <cl@...ux.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Vlastimil Babka <vbabka@...e.cz>, kemi <kemi.wang@...el.com>, Dave <dave.hansen@...ux.intel.com>, Tim Chen <tim.c.chen@...el.com>, Andi Kleen <andi.kleen@...el.com>, Jesper Dangaard Brouer <brouer@...hat.com>, Ying Huang <ying.huang@...el.com>, Aaron Lu <aaron.lu@...el.com>, Proc sysctl <linux-fsdevel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 2/3] mm: Handle numa statistics distinctively based-on different VM stats modes On 2017年09月15日 19:50, Michal Hocko wrote: > On Fri 15-09-17 17:23:25, Kemi Wang wrote: > [...] >> @@ -2743,6 +2745,17 @@ static inline void zone_statistics(struct zone *preferred_zone, struct zone *z) >> #ifdef CONFIG_NUMA >> enum numa_stat_item local_stat = NUMA_LOCAL; >> >> + /* >> + * skip zone_statistics() if vmstat is a coarse mode or zone statistics >> + * is inactive in auto vmstat mode >> + */ >> + >> + if (vmstat_mode) { >> + if (vmstat_mode == VMSTAT_COARSE_MODE) >> + return; >> + } else if (disable_zone_statistics) >> + return; >> + >> if (z->node != numa_node_id()) >> local_stat = NUMA_OTHER; > > A jump label could make this completely out of the way for the case > where every single cycle matters. > Could you be more explicit for how to implement it here. Thanks very much.
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