Messages in this thread | | | Date | Mon, 14 Jan 2008 17:08:04 -0800 | From | Randy Dunlap <> | Subject | Re: [RFC][PATCH 3/5] add /dev/mem_notify device |
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On Tue, 15 Jan 2008 10:01:21 +0900 KOSAKI Motohiro wrote:
> the core of this patch series. > add /dev/mem_notify device for notification low memory to user process. > > <usage examle> > > fd = open("/dev/mem_notify", O_RDONLY); > if (fd < 0) { > exit(1); > } > pollfds.fd = fd; > pollfds.events = POLLIN; > pollfds.revents = 0; > err = poll(&pollfds, 1, -1); // wake up at low memory > > ... > </usage example> > > Signed-off-by: Marcelo Tosatti <marcelo@kvack.org> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > > --- > drivers/char/mem.c | 6 ++ > include/linux/mem_notify.h | 41 ++++++++++++++++ > include/linux/mmzone.h | 1 > mm/Makefile | 2 > mm/mem_notify.c | 109 +++++++++++++++++++++++++++++++++++++++++++++ > mm/page_alloc.c | 1 > 6 files changed, 159 insertions(+), 1 deletion(-) >
Hi,
1/ I don't see the file below listed in the diffstat above...
2/ Where is the userspace interface information for the syscall?
> Index: linux-2.6.24-rc6-mm1-memnotify/Documentation/devices.txt > =================================================================== > --- linux-2.6.24-rc6-mm1-memnotify.orig/Documentation/devices.txt 2008-01-13 16:42:57.000000000 +0900 > +++ linux-2.6.24-rc6-mm1-memnotify/Documentation/devices.txt 2008-01-13 17:07:05.000000000 +0900 > @@ -96,6 +96,7 @@ Your cooperation is appreciated. > 11 = /dev/kmsg Writes to this come out as printk's > 12 = /dev/oldmem Used by crashdump kernels to access > the memory of the kernel that crashed. > + 13 = /dev/mem_notify Low memory notification. > > 1 block RAM disk > 0 = /dev/ram0 First RAM disk
--- ~Randy
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