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From: Lin Feng <linfeng@cn.fujitsu.com>
To: Simon Jeons <simon.jeons@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org,
	walken@google.com, kamezawa.hiroyu@jp.fujitsu.com,
	minchan@kernel.org, riel@redhat.com, rientjes@google.com,
	isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com,
	laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz,
	linux-mm@kvack.org, linux-aio@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()
Date: Wed, 20 Feb 2013 18:23:39 +0800	[thread overview]
Message-ID: <5124A42B.1020905@cn.fujitsu.com> (raw)
In-Reply-To: <51249E3E.9070909@gmail.com>

Hi Simon,

On 02/20/2013 05:58 PM, Simon Jeons wrote:
> 
>>
>> The other is that this almost certainly broken for transhuge page
>> handling. gup returns the head and tail pages and ordinarily this is ok
> 
> When need gup thp? in kvm case?

gup just pins the wanted pages(for x86 is 4k size) of user address space in memory.
We can't expect the pages have been allocated for user address space are thp or 
normal page. So we need to deal with them and I think it have nothing to do with kvm.

thanks,
linfeng

WARNING: multiple messages have this Message-ID (diff)
From: Lin Feng <linfeng@cn.fujitsu.com>
To: Simon Jeons <simon.jeons@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org,
	walken@google.com, kamezawa.hiroyu@jp.fujitsu.com,
	minchan@kernel.org, riel@redhat.com, rientjes@google.com,
	isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com,
	laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz,
	linux-mm@kvack.org, linux-aio@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()
Date: Wed, 20 Feb 2013 18:23:39 +0800	[thread overview]
Message-ID: <5124A42B.1020905@cn.fujitsu.com> (raw)
In-Reply-To: <51249E3E.9070909@gmail.com>

Hi Simon,

On 02/20/2013 05:58 PM, Simon Jeons wrote:
> 
>>
>> The other is that this almost certainly broken for transhuge page
>> handling. gup returns the head and tail pages and ordinarily this is ok
> 
> When need gup thp? in kvm case?

gup just pins the wanted pages(for x86 is 4k size) of user address space in memory.
We can't expect the pages have been allocated for user address space are thp or 
normal page. So we need to deal with them and I think it have nothing to do with kvm.

thanks,
linfeng

--
To unsubscribe, send a message with 'unsubscribe linux-aio' in
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see: http://www.kvack.org/aio/
Don't email: <a href=mailto:"aart@kvack.org">aart@kvack.org</a>

WARNING: multiple messages have this Message-ID (diff)
From: Lin Feng <linfeng@cn.fujitsu.com>
To: Simon Jeons <simon.jeons@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org,
	walken@google.com, kamezawa.hiroyu@jp.fujitsu.com,
	minchan@kernel.org, riel@redhat.com, rientjes@google.com,
	isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com,
	laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz,
	linux-mm@kvack.org, linux-aio@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()
Date: Wed, 20 Feb 2013 18:23:39 +0800	[thread overview]
Message-ID: <5124A42B.1020905@cn.fujitsu.com> (raw)
In-Reply-To: <51249E3E.9070909@gmail.com>

Hi Simon,

On 02/20/2013 05:58 PM, Simon Jeons wrote:
> 
>>
>> The other is that this almost certainly broken for transhuge page
>> handling. gup returns the head and tail pages and ordinarily this is ok
> 
> When need gup thp? in kvm case?

gup just pins the wanted pages(for x86 is 4k size) of user address space in memory.
We can't expect the pages have been allocated for user address space are thp or 
normal page. So we need to deal with them and I think it have nothing to do with kvm.

thanks,
linfeng

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  reply	other threads:[~2013-02-20 11:11 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-04 10:04 [PATCH 0/2] mm: hotplug: implement non-movable version of get_user_pages() to kill long-time pin pages Lin Feng
2013-02-04 10:04 ` Lin Feng
2013-02-04 10:04 ` [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() Lin Feng
2013-02-04 10:04   ` Lin Feng
2013-02-04 10:04   ` Lin Feng
2013-02-05  0:06   ` Andrew Morton
2013-02-05  0:06     ` Andrew Morton
2013-02-05  0:06     ` Andrew Morton
2013-02-05  0:18     ` Andrew Morton
2013-02-05  0:18       ` Andrew Morton
2013-02-05  3:09     ` Lin Feng
2013-02-05  3:09       ` Lin Feng
2013-02-05  3:09       ` Lin Feng
2013-02-05 21:13       ` Andrew Morton
2013-02-05 21:13         ` Andrew Morton
2013-02-05 21:13         ` Andrew Morton
2013-02-05 11:57     ` Mel Gorman
2013-02-05 11:57       ` Mel Gorman
2013-02-05 11:57       ` Mel Gorman
2013-02-05 13:32       ` Mel Gorman
2013-02-05 13:32         ` Mel Gorman
2013-02-05 13:32         ` Mel Gorman
2013-02-19 13:37         ` Lin Feng
2013-02-19 13:37           ` Lin Feng
2013-02-20  2:34           ` Lin Feng
2013-02-20  2:34             ` Lin Feng
2013-02-20  2:34             ` Lin Feng
2013-02-20  2:44             ` Wanpeng Li
2013-02-20  2:44             ` Wanpeng Li
2013-02-20  2:44             ` Wanpeng Li
2013-02-20  2:59               ` Lin Feng
2013-02-20  2:59                 ` Lin Feng
2013-02-20  9:58         ` Simon Jeons
2013-02-20  9:58           ` Simon Jeons
2013-02-20 10:23           ` Lin Feng [this message]
2013-02-20 10:23             ` Lin Feng
2013-02-20 10:23             ` Lin Feng
2013-02-20 11:31             ` Simon Jeons
2013-02-20 11:31               ` Simon Jeons
2013-02-20 11:54               ` Lin Feng
2013-02-20 11:54                 ` Lin Feng
2013-02-20 11:54                 ` Lin Feng
2013-02-06  2:26       ` Michel Lespinasse
2013-02-06  2:26         ` Michel Lespinasse
2013-02-06  2:26         ` Michel Lespinasse
2013-02-06 10:41         ` Mel Gorman
2013-02-06 10:41           ` Mel Gorman
2013-02-18 10:34       ` Lin Feng
2013-02-18 10:34         ` Lin Feng
2013-02-18 10:34         ` Lin Feng
2013-02-18 15:17         ` Mel Gorman
2013-02-18 15:17           ` Mel Gorman
2013-02-18 15:17           ` Mel Gorman
2013-02-19  9:55           ` Lin Feng
2013-02-19  9:55             ` Lin Feng
2013-02-19 10:34             ` Mel Gorman
2013-02-19 10:34               ` Mel Gorman
2013-02-19 10:34               ` Mel Gorman
2013-02-04 10:04 ` [PATCH 2/2] fs/aio.c: use get_user_pages_non_movable() to pin ring pages when support memory hotremove Lin Feng
2013-02-04 10:04   ` Lin Feng
2013-02-04 10:04   ` Lin Feng
2013-02-04 15:18   ` Jeff Moyer
2013-02-04 15:18     ` Jeff Moyer
2013-02-04 15:18     ` Jeff Moyer
2013-02-04 23:02     ` Zach Brown
2013-02-04 23:02       ` Zach Brown
2013-02-04 23:02       ` Zach Brown
2013-02-05  5:35       ` Lin Feng
2013-02-05  5:35         ` Lin Feng
2013-02-05  5:35         ` Lin Feng
2013-02-05  5:06     ` Lin Feng
2013-02-05  5:06       ` Lin Feng
2013-02-05  0:58 ` [PATCH 0/2] mm: hotplug: implement non-movable version of get_user_pages() to kill long-time pin pages Minchan Kim
2013-02-05  0:58   ` Minchan Kim
2013-02-05  0:58   ` Minchan Kim
2013-02-05  4:42   ` Lin Feng
2013-02-05  4:42     ` Lin Feng
2013-02-05  5:25     ` Minchan Kim
2013-02-05  5:25       ` Minchan Kim
2013-02-05  5:25       ` Minchan Kim
2013-02-05  6:18       ` Lin Feng
2013-02-05  6:18         ` Lin Feng
2013-02-05  7:45         ` Minchan Kim
2013-02-05  7:45           ` Minchan Kim
2013-02-05  7:45           ` Minchan Kim
2013-02-05  8:27           ` Lin Feng
2013-02-05  8:27             ` Lin Feng
2013-02-05  8:27             ` Lin Feng

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