From: Zheng Liu <gnehzuil.liu@gmail.com>
To: Kautuk Consul <consul.kautuk@gmail.com>
Cc: minchan@kernel.org, riel@redhat.com,
kosaki.motohiro@jp.fujitsu.com, Zheng Liu <wenqing.lz@taobao.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: Fwd: Control page reclaim granularity
Date: Tue, 13 Mar 2012 16:05:35 +0800 [thread overview]
Message-ID: <20120313080535.GA5243@gmail.com> (raw)
In-Reply-To: <CAFPAmTS-ExDtS7rpJoygc6MCwC10spapyThq7=5cCCGFbjZtqA@mail.gmail.com>
On Tue, Mar 13, 2012 at 01:17:41PM +0530, Kautuk Consul wrote:
> On Tue, Mar 13, 2012 at 1:13 PM, Kautuk Consul <consul.kautuk@gmail.com> wrote:
> > Hi,
> >
> > I noticed this discussion and decided to pitch in one small idea from my side.
> >
> > It would be nice to range lock an inode's pages by storing those
> > ranges which would be locked.
> > This could also add some good routines for the kernel in terms of
> > range locking for a single inode.
> > However, wouldn't this add some overhead to shrink_page_list() since
> > that code would need to go through
> > all these ranges while trying to reclaim a single page ?
> >
> > One small suggestion from my side is:
> > Why don't we implement something like : "Complete page-cache reclaim
> > control from usermode"?
> > In this, we can set/unset the mapping to AS_UNEVICTABLE (as Konstantin
> > mentioned) for a file's
> > inode from usermode by using ioctl or fcntl or maybe even go as far as
> > implementing an O_NORECL
> > option to the open system call.
> >
>
> Of course, only an application executing with root privileges should
> be allowed to set the inode's
> mapping flags in this manner.
Hi Kautuk,
IMHO, running application with root privilege is too dangerous. We
should avoid it.
Regards,
Zheng
>
>
> > After setting the AS_UNEVICTABLE, the usermode application can choose
> > to keep and remove pages by
> > using the fadvise(WILLNEED) and fadvise(DONTNEED).
> >
> > ( I think maybe the presence of any VMA is might not really be
> > required for this idea. )
> >
> > Thanks,
> > Kautuk.
>
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next prev parent reply other threads:[~2012-03-13 8:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 7:34 Control page reclaim granularity Zheng Liu
2012-03-08 8:39 ` Greg Thelen
2012-03-08 16:13 ` Zheng Liu
2012-03-08 16:32 ` Zhu Yanhai
2012-03-14 7:19 ` Greg Thelen
2012-03-08 9:35 ` Minchan Kim
2012-03-08 16:54 ` Zheng Liu
2012-03-12 0:28 ` Minchan Kim
2012-03-12 2:06 ` Fwd: " Zheng Liu
2012-03-12 5:19 ` Minchan Kim
2012-03-12 6:20 ` Konstantin Khlebnikov
2012-03-12 8:14 ` Zheng Liu
2012-03-12 13:42 ` Minchan Kim
2012-03-12 14:18 ` Konstantin Khlebnikov
2012-03-13 2:48 ` Minchan Kim
2012-03-13 4:37 ` Konstantin Khlebnikov
2012-03-13 5:00 ` Konstantin Khlebnikov
2012-03-13 6:30 ` Zheng Liu
2012-03-13 6:48 ` Zheng Liu
2012-03-13 7:21 ` Konstantin Khlebnikov
2012-03-13 7:43 ` Kautuk Consul
2012-03-13 7:47 ` Kautuk Consul
2012-03-13 8:05 ` Zheng Liu [this message]
2012-03-13 8:04 ` Kautuk Consul
2012-03-13 8:08 ` Kautuk Consul
2012-03-13 8:28 ` Zheng Liu
2012-03-13 8:36 ` Kautuk Consul
2012-03-13 9:03 ` Kautuk Consul
2012-03-12 15:15 ` Zheng Liu
2012-03-13 2:51 ` Minchan Kim
2012-03-12 14:55 ` Rik van Riel
2012-03-13 2:57 ` Minchan Kim
2012-03-13 14:57 ` Rik van Riel
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