linux-kernel - Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface

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Date:   Wed, 26 Jul 2017 09:30:26 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Rik van Riel <riel@...hat.com>
Cc:     "Huang\, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>, Shaohua Li <shli@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface

Hi, Rik,

Rik van Riel <riel@...hat.com> writes:

> On Tue, 2017-07-25 at 09:51 +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.huang@...el.com>
>> 
>> The swap cache stats could be gotten only via sysrq, which isn't
>> convenient in some situation.  So the sysfs interface of swap cache
>> stats is added for that.  The added sysfs directories/files are as
>> follow,
>> 
>> /sys/kernel/mm/swap
>> /sys/kernel/mm/swap/cache_find_total
>> /sys/kernel/mm/swap/cache_find_success
>> /sys/kernel/mm/swap/cache_add
>> /sys/kernel/mm/swap/cache_del
>> /sys/kernel/mm/swap/cache_pages
>> 
> What is the advantage of this vs new fields in
> /proc/vmstat, which is where most of the VM
> statistics seem to live?

As proposed by Andrew, will use debugfs for them, because they are
mostly developer related.

Best Regards,
Huang, Ying