linux-kernel - Re: computing drop-able caches

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Message-ID: <56BE2396.30801@cisco.com>
Date:	Fri, 12 Feb 2016 10:25:26 -0800
From:	Daniel Walker <danielwa@...co.com>
To:	Dave Hansen <dave.hansen@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, "Khalid Mughal (khalidm)" <khalidm@...co.com>,
	"xe-kernel@...ernal.cisco.com" <xe-kernel@...ernal.cisco.com>
Subject: Re: computing drop-able caches

On 02/12/2016 10:18 AM, Dave Hansen wrote:
> On 02/12/2016 10:15 AM, Daniel Walker wrote:
>> On 02/12/2016 10:06 AM, Dave Hansen wrote:
>>> On 01/28/2016 03:42 PM, Daniel Walker wrote:
>>>> My colleague Khalid and I are working on a patch which will provide a
>>>> /proc file to output the size of the drop-able page cache.
>>>> One way to implement this is to use the current drop_caches /proc
>>>> routine, but instead of actually droping the caches just add
>>>> up the amount.
>>> Code, please.
>> We have a process for release code which doesn't allow us to send it
>> immediately. B
> OK, how about we continue this discussion once you can release it?

I understand you want to see it, and we will release it (sometime today) 
.. But the code is not sophisticated, it just counts the caches which 
would be dropped reusing much of fs/drop_caches.c .

Daniel