From: Dave Hansen <dave.hansen@intel.com>
To: Daniel Walker <danielwa@cisco.com>,
"Khalid Mughal (khalidm)" <khalidm@cisco.com>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>
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>
Subject: Re: computing drop-able caches
Date: Wed, 10 Feb 2016 10:13:50 -0800 [thread overview]
Message-ID: <56BB7DDE.8080206@intel.com> (raw)
In-Reply-To: <56BB7BC7.4040403@cisco.com>
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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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Daniel Walker <danielwa@cisco.com>,
"Khalid Mughal (khalidm)" <khalidm@cisco.com>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>
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>
Subject: Re: computing drop-able caches
Date: Wed, 10 Feb 2016 10:13:50 -0800 [thread overview]
Message-ID: <56BB7DDE.8080206@intel.com> (raw)
In-Reply-To: <56BB7BC7.4040403@cisco.com>
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
next prev parent reply other threads:[~2016-02-10 18:13 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-28 23:42 computing drop-able caches Daniel Walker
2016-01-28 23:42 ` Daniel Walker
2016-01-28 23:58 ` Johannes Weiner
2016-01-28 23:58 ` Johannes Weiner
2016-01-29 1:03 ` Daniel Walker
2016-01-29 1:03 ` Daniel Walker
2016-01-29 1:29 ` Daniel Walker
2016-01-29 1:55 ` Johannes Weiner
2016-01-29 1:55 ` Johannes Weiner
2016-01-29 21:21 ` Daniel Walker
2016-01-29 21:21 ` Daniel Walker
2016-01-29 22:33 ` Johannes Weiner
2016-01-29 22:33 ` Johannes Weiner
2016-01-29 22:41 ` Rik van Riel
2016-01-29 22:41 ` Rik van Riel
2016-02-08 20:57 ` Khalid Mughal (khalidm)
2016-02-08 20:57 ` Khalid Mughal (khalidm)
2016-02-10 18:04 ` Daniel Walker
2016-02-10 18:04 ` Daniel Walker
2016-02-10 18:13 ` Dave Hansen [this message]
2016-02-10 18:13 ` Dave Hansen
2016-02-10 19:11 ` Daniel Walker
2016-02-10 19:11 ` Daniel Walker
2016-02-11 22:11 ` Rik van Riel
2016-02-12 18:01 ` Khalid Mughal (khalidm)
2016-02-12 21:46 ` Dave Hansen
2016-02-12 21:46 ` Dave Hansen
2016-02-12 21:46 ` Dave Hansen
2016-02-12 22:15 ` Johannes Weiner
2016-02-12 22:15 ` Johannes Weiner
2016-02-12 22:15 ` Johannes Weiner
2016-02-12 18:06 ` Dave Hansen
2016-02-12 18:06 ` Dave Hansen
2016-02-12 18:15 ` Daniel Walker
2016-02-12 18:15 ` Daniel Walker
2016-02-12 18:18 ` Dave Hansen
2016-02-12 18:18 ` Dave Hansen
2016-02-12 18:25 ` Daniel Walker
2016-02-12 18:25 ` Daniel Walker
2016-02-12 20:15 ` Daniel Walker
2016-02-12 20:15 ` Daniel Walker
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