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

From	"Huang\, Ying" <ying.huang@intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface
Date	2017-07-26 03:40 +0200
Message-ID	<u7jsS-29R-13@gated-at.bofh.it> (permalink)
References	<u6XiF-4S8-3@gated-at.bofh.it> <u6XiG-4S8-5@gated-at.bofh.it> <u7ffC-82I-81@gated-at.bofh.it>
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Hi, Rik,

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

> On Tue, 2017-07-25 at 09:51 +0800, Huang, Ying wrote:
>> From: Huang Ying <ying.huang@intel.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

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[PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface "Huang, Ying" <ying.huang@intel.com> - 2017-07-25 04:00 +0200
  Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs  interface Andrew Morton <akpm@linux-foundation.org> - 2017-07-25 22:50 +0200
    Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface "Huang\, Ying" <ying.huang@intel.com> - 2017-07-26 03:30 +0200
  Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs  interface Rik van Riel <riel@redhat.com> - 2017-07-25 23:10 +0200
    Re: [PATCH -mm -v3 1/6] mm, swap: Add swap cache statistics sysfs interface "Huang\, Ying" <ying.huang@intel.com> - 2017-07-26 03:40 +0200

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