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

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Message-ID: <1501016754.26846.22.camel@redhat.com>
Date:   Tue, 25 Jul 2017 17:05:54 -0400
From:   Rik van Riel <riel@...hat.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     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

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?

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