linux-kernel - Re: [PATCH 2/3] mm: Handle numa statistics distinctively based-on different VM stats modes

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Message-ID: <1bd90605-c765-ca27-b8ee-ca803a8bcdea@linux.intel.com>
Date:   Sun, 17 Sep 2017 21:13:13 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     kemi <kemi.wang@...el.com>, 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>,
        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 09/17/2017 08:07 PM, kemi wrote:
>>> +	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.

Take a look at include/linux/jump_label.h.