linux-kernel - Re: [PATCH] [RFC] ummunotify: Userspace support for MMU notifications

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Message-Id: <20100407103813.74b54a87.randy.dunlap@oracle.com>
Date:	Wed, 7 Apr 2010 10:38:13 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Eric B Munson <ebmunson@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	rolandd@...co.com, peterz@...radead.org, pavel@....cz,
	mingo@...e.hu
Subject: Re: [PATCH] [RFC] ummunotify: Userspace support for MMU
 notifications

On Wed,  7 Apr 2010 13:30:29 +0100 Eric B Munson wrote:

> Signed-off-by: Roland Dreier <rolandd <at> cisco.com>

Use unobfuscated @.

> Signed-off-by: Eric B Munson <ebmunson@...ibm.com>
> 
> ---
> 
> Changes since v3:
>  - Fixed replaced [get|put] user with copy_[from|to]_user to fix x86
>    builds
> ---
>  Documentation/Makefile    |    3 +-
>  drivers/char/Kconfig      |   12 +
>  drivers/char/Makefile     |    1 +
>  drivers/char/ummunotify.c |  567 +++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 582 insertions(+), 1 deletions(-)
>  create mode 100644 drivers/char/ummunotify.c
> 
> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index 6fc7ea1..27ba76a 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -1,3 +1,4 @@
>  obj-m := DocBook/ accounting/ auxdisplay/ connector/ \
>  	filesystems/ filesystems/configfs/ ia64/ laptops/ networking/ \
> -	pcmcia/ spi/ timers/ video4linux/ vm/ watchdog/src/
> +	pcmcia/ spi/ timers/ video4linux/ vm/ ummunotify/ \
> +	watchdog/src/

What is this change to Documentation/Makefile for?
Is there some file that should be added in Documentation/ummunotify/ ?


> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index 3141dd3..cf26019 100644
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -1111,6 +1111,18 @@ config DEVPORT
>  	depends on ISA || PCI
>  	default y
>  
> +config UMMUNOTIFY
> +       tristate "Userspace MMU notifications"
> +       select MMU_NOTIFIER
> +       help
> +         The ummunotify (userspace MMU notification) driver creates a
> +         character device that can be used by userspace libraries to
> +         get notifications when an application's memory mapping
> +         changed.  This is used, for example, by RDMA libraries to
> +         improve the reliability of memory registration caching, since
> +         the kernel's MMU notifications can be used to know precisely
> +         when to shoot down a cached registration.
> +
>  source "drivers/s390/char/Kconfig"
>  
>  endmenu
> diff --git a/drivers/char/Makefile b/drivers/char/Makefile
> index f957edf..521e5de 100644
> --- a/drivers/char/Makefile
> +++ b/drivers/char/Makefile
> @@ -97,6 +97,7 @@ obj-$(CONFIG_NSC_GPIO)		+= nsc_gpio.o
>  obj-$(CONFIG_CS5535_GPIO)	+= cs5535_gpio.o
>  obj-$(CONFIG_GPIO_TB0219)	+= tb0219.o
>  obj-$(CONFIG_TELCLOCK)		+= tlclk.o
> +obj-$(CONFIG_UMMUNOTIFY)	+= ummunotify.o
>  
>  obj-$(CONFIG_MWAVE)		+= mwave/
>  obj-$(CONFIG_AGP)		+= agp/


---
~Randy
--
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