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Subject: Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs
 interface
From: Rik van Riel <riel@redhat.com>
To: "Huang, Ying" <ying.huang@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Johannes Weiner <hannes@cmpxchg.org>, Minchan Kim <minchan@kernel.org>,
        Shaohua Li <shli@kernel.org>, Hugh Dickins <hughd@google.com>,
        Fengguang Wu <fengguang.wu@intel.com>, Tim Chen <tim.c.chen@intel.com>,
        Dave Hansen <dave.hansen@intel.com>
Date: Tue, 25 Jul 2017 17:05:54 -0400
In-Reply-To: <20170725015151.19502-2-ying.huang@intel.com>
References: <20170725015151.19502-1-ying.huang@intel.com>
         <20170725015151.19502-2-ying.huang@intel.com>
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On Tue, 2017-07-25 at 09:51 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@intel.com>
>=20
> The swap cache stats could be gotten only via sysrq, which isn't
> convenient in some situation.=C2=A0=C2=A0So the sysfs interface of swap c=
ache
> stats is added for that.=C2=A0=C2=A0The added sysfs directories/files are=
 as
> follow,
>=20
> /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
>=20
What is the advantage of this vs new fields in
/proc/vmstat, which is where most of the VM
statistics seem to live?

--=20
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