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From: Dave Hansen <dave.hansen-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Matthew Wilcox <willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Christopher Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
	Mel Gorman <mel-wJa12IhQEiizQB+pC5nmwQ@public.gmane.org>,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
	Thomas Schoebel-Theuer
	<tst-0Nly+W1lFbFDiq0p6IFu4YQuADTiUCJX@public.gmane.org>,
	andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org,
	Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Guy Shattah <sguy-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Anshuman Khandual
	<khandual-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
	Michal Nazarewicz
	<mina86-deATy8a+UHjQT0dZR+AlfA@public.gmane.org>,
	Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>,
	David Nellans <dnellans-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Laura Abbott <labbott-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>,
	Mike Kravetz
	<mike.kravetz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Subject: Re: [RFC 1/2] Protect larger order pages from breaking up
Date: Fri, 16 Feb 2018 13:47:55 -0800	[thread overview]
Message-ID: <4925b480-f6ef-1a7a-66ac-75c8ec9d9d58@intel.com> (raw)
In-Reply-To: <20180216214353.GA32655-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>

On 02/16/2018 01:43 PM, Matthew Wilcox wrote:
>> There's definitely no perfect solution.
>>
>> But, in general, I think we should cater to the dumbest users.  Folks
>> doing higher-order allocations are not that.  I say we make the picture
>> the most clear for the traditional 4k users.
> Your way might be confusing -- if there's a system which is under varying
> amounts of jumboframe load and all the 16k pages get gobbled up by the
> ethernet driver, MemFree won't change at all, for example.

IOW, you agree that "there's definitely no perfect solution." :)
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Christopher Lameter <cl@linux.com>, Mel Gorman <mel@skynet.ie>,
	linux-mm@kvack.org, linux-rdma@vger.kernel.org,
	akpm@linux-foundation.org,
	Thomas Schoebel-Theuer <tst@schoebel-theuer.de>,
	andi@firstfloor.org, Rik van Riel <riel@redhat.com>,
	Michal Hocko <mhocko@kernel.org>, Guy Shattah <sguy@mellanox.com>,
	Anshuman Khandual <khandual@linux.vnet.ibm.com>,
	Michal Nazarewicz <mina86@mina86.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	David Nellans <dnellans@nvidia.com>,
	Laura Abbott <labbott@redhat.com>, Pavel Machek <pavel@ucw.cz>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [RFC 1/2] Protect larger order pages from breaking up
Date: Fri, 16 Feb 2018 13:47:55 -0800	[thread overview]
Message-ID: <4925b480-f6ef-1a7a-66ac-75c8ec9d9d58@intel.com> (raw)
In-Reply-To: <20180216214353.GA32655@bombadil.infradead.org>

On 02/16/2018 01:43 PM, Matthew Wilcox wrote:
>> There's definitely no perfect solution.
>>
>> But, in general, I think we should cater to the dumbest users.  Folks
>> doing higher-order allocations are not that.  I say we make the picture
>> the most clear for the traditional 4k users.
> Your way might be confusing -- if there's a system which is under varying
> amounts of jumboframe load and all the 16k pages get gobbled up by the
> ethernet driver, MemFree won't change at all, for example.

IOW, you agree that "there's definitely no perfect solution." :)

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  parent reply	other threads:[~2018-02-16 21:47 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-16 16:01 [RFC 0/2] Larger Order Protection V1 Christoph Lameter
2018-02-16 16:01 ` [RFC 1/2] Protect larger order pages from breaking up Christoph Lameter
2018-02-16 16:01   ` Christoph Lameter
     [not found]   ` <20180216160121.519788537-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2018-02-16 17:03     ` Andi Kleen
2018-02-16 17:03       ` Andi Kleen
     [not found]       ` <20180216170354.vpbuugzqsrrfc4js-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2018-02-16 18:25         ` Christopher Lameter
2018-02-16 18:25           ` Christopher Lameter
2018-02-16 19:01     ` Dave Hansen
2018-02-16 19:01       ` Dave Hansen
2018-02-16 20:15       ` Christopher Lameter
2018-02-16 21:08         ` Dave Hansen
2018-02-16 21:08           ` Dave Hansen
2018-02-16 21:43           ` Matthew Wilcox
     [not found]             ` <20180216214353.GA32655-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2018-02-16 21:47               ` Dave Hansen [this message]
2018-02-16 21:47                 ` Dave Hansen
2018-02-16 18:02   ` Randy Dunlap
     [not found]     ` <b76028c6-c755-8178-2dfc-81c7db1f8bed-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-02-17 16:07       ` Mike Rapoprt
2018-02-17 16:07         ` Mike Rapoprt
2018-02-16 18:59   ` Mike Kravetz
     [not found]     ` <5108eb20-2b20-bd48-903e-bce312e96974-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2018-02-16 20:13       ` Christopher Lameter
2018-02-16 20:13         ` Christopher Lameter
2018-02-18  9:00         ` Guy Shattah
2018-02-18  9:00           ` Guy Shattah
2018-02-19 10:19   ` Mel Gorman
2018-02-19 14:42     ` Michal Hocko
2018-02-19 15:09     ` Christopher Lameter
2018-02-22 21:19     ` Thomas Schoebel-Theuer
2018-02-22 21:53       ` Zi Yan
2018-02-23  2:01         ` Christopher Lameter
2018-02-23  2:16           ` Zi Yan
2018-02-23  2:45             ` Christopher Lameter
2018-02-23  9:59       ` Mel Gorman
2018-02-16 16:01 ` [RFC 2/2] Page order diagnostics Christoph Lameter
2018-02-16 16:01   ` Christoph Lameter
     [not found]   ` <20180216160121.583566579-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2018-02-17 21:17     ` Pavel Machek
2018-02-17 21:17       ` Pavel Machek
2018-02-19 14:54       ` Christopher Lameter
2018-02-16 18:27 ` [RFC 0/2] Larger Order Protection V1 Christopher Lameter

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