Messages in this thread | | | Date | Fri, 2 Aug 2013 04:57:58 +0800 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH] drivers: base: new memory config sysfs driver for large memory systems |
| |
On Fri, Jul 26, 2013 at 09:33:44AM -0500, Seth Jennings wrote: > On Thu, Jul 25, 2013 at 04:38:00PM -0700, Greg Kroah-Hartman wrote: > > On Thu, Jul 25, 2013 at 04:11:20PM -0500, Seth Jennings wrote: > > > From: Nathan Fontenot <nfont@linux.vnet.ibm.com> > > > > > > Large memory systems (1TB or more) experience boot delays on the order > > > of minutes due to the initializing the memory configuration part of > > > sysfs at /sys/devices/system/memory/. > > > > > > ppc64 has a memory block size of 256M and (I think) x86 is 128M. With 1TB > > > of RAM and a 256M block size, that's 4k memory blocks with 20 sysfs > > > entries per block that's around 80k items that need be created at boot > > > time in sysfs. Some systems go up to 16TB where the issue is > > > even more severe. > > > > > > This patch is a prototype for a new sysfs memory layout where the > > > entries are created on demand by writing memory block numbers into a > > > "show" and "hide" files to create and destroy the memory block > > > configuration attributes in sysfs. This would decouple the number of > > > sysfs entries created at boot time from the memory size, resulting in a > > > sysfs initialization time that doesn't increase and memory size > > > increase. > > > > > > Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> > > > Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> > > > > How does this tie into the patches Nathan sent yesterday for memory > > hotplug stuff that I thought modified the same part of the kernel? > > So this patch introduces the new layout in a new file > drives/base/memfs.c (which, in light of your last comment should > probably be something more like largememory.c). > > It doesn't clash with Nathan's, but it doesn't contain the new > is_memblock_[removable|offline] functions or the new "release" > attribute. But that can be added easily.
Can you two please work together on this so I we don't have to deal with competing patch sets and get confused as to what is really going on here?
thanks,
greg k-h
| |