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Subject: Re: computing drop-able caches
To: Daniel Walker <danielwa@cisco.com>,
 "Khalid Mughal (khalidm)" <khalidm@cisco.com>, Rik van Riel
 <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>
References: <56AAA77D.7090000@cisco.com> <20160128235815.GA5953@cmpxchg.org>
 <56AABA79.3030103@cisco.com> <56AAC085.9060509@cisco.com>
 <20160129015534.GA6401@cmpxchg.org> <56ABEAA7.1020706@redhat.com>
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Cc: Alexander Viro <viro@zeniv.linux.org.uk>, Michal Hocko <mhocko@suse.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 "linux-mm@kvack.org" <linux-mm@kvack.org>,
 "xe-kernel@external.cisco.com" <xe-kernel@external.cisco.com>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <56BB7DDE.8080206@intel.com>
Date: Wed, 10 Feb 2016 10:13:50 -0800
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On 02/10/2016 10:04 AM, Daniel Walker wrote:
>> [Linux_0:/]$ echo 3 > /proc/sys/vm/drop_caches
>> [Linux_0:/]$ cat /proc/meminfo
>> MemTotal:        3977836 kB
>> MemFree:         1095012 kB
>> MemAvailable:    1434148 kB
> 
> I suspect MemAvailable takes into account more than just the droppable
> caches. For instance, reclaimable slab is included, but I don't think
> drop_caches drops that part.

There's a bit for page cache and a bit for slab, see:

	https://kernel.org/doc/Documentation/sysctl/vm.txt


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