Idea of Memory hotplug
Dear all.
I'm going to enhance some features in Linux that could replace highly reliable/available system like mainframe and UNIX. My first interest is Memory hotplug functionality.
Hot remove memory is not only needed for online memory maintenance but also necessary for the dynamic re-partitioning(*) functionality, which many mainframe systems already support.
(*) Memory and CPUs of a system can be divided into several independent sets to form multiple independent computers ("partitioning"). Re-partitioning means moving separation boundary of memory (and CPUs, maybe) to improve resource utilization.
My idea is followings.
- Basically, swap out memory on node which user want to remove.
- Areas which can't be removed is collected to node 0.
- Node 0 is NOT hotpluggable, but other nodes are hotpluggable.
- User area (which is able to be swapped out in many case) allocated at ZONE_HIGHMEM now, so we will make it as follows.
Now
node 0 node 1 node 2
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA ZONE_DMA ZONE_DMA
ZONE_NORMAL ZONE_NORMAL ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM ZONE_HIGHMEM
We want to make like this.
node 0 node 1 node 2
(unhotpluggable) (hotpluggable) (hotpluggable)
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA
ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM
Todo list:
- Pages which without secondary store.
The page caches of virtural file system like sysfs.
- Huge TLB page which cannot be page out.
- Pages which need time to become free.
Pages which are being sent by sendfile, or accessed by NFS.
- DMA mapping area.
- And so on....
I wish I will have comments from anybody.
And,I want to find other appropriate mailing-list
about this discussion if you know.
Best regards.
Signature · 13 lines
Yasunori Goto <ygoto at fsw.fujitsu.com> ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net [email protected] https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
Dear all.
I'm going to enhance some features in Linux that could replace highly reliable/available system like mainframe and UNIX. My first interest is Memory hotplug functionality.
Hot remove memory is not only needed for online memory maintenance but also necessary for the dynamic re-partitioning(*) functionality, which many mainframe systems already support.
(*) Memory and CPUs of a system can be divided into several independent sets to form multiple independent computers ("partitioning"). Re-partitioning means moving separation boundary of memory (and CPUs, maybe) to improve resource utilization.
My idea is followings.
- Basically, swap out memory on node which user want to remove.
- Areas which can't be removed is collected to node 0.
- Node 0 is NOT hotpluggable, but other nodes are hotpluggable.
- User area (which is able to be swapped out in many case) allocated at ZONE_HIGHMEM now, so we will make it as follows.
Now
node 0 node 1 node 2
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA ZONE_DMA ZONE_DMA
ZONE_NORMAL ZONE_NORMAL ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM ZONE_HIGHMEM
We want to make like this.
node 0 node 1 node 2
(unhotpluggable) (hotpluggable) (hotpluggable)
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA
ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM
Todo list:
- Pages which without secondary store.
The page caches of virtural file system like sysfs.
- Huge TLB page which cannot be page out.
- Pages which need time to become free.
Pages which are being sent by sendfile, or accessed by NFS.
- DMA mapping area.
- And so on....
I wish I will have comments from anybody.
And,I want to find other appropriate mailing-list
about this discussion if you know.
Best regards.
Signature · 18 lines
Yasunori Goto <ygoto at fsw.fujitsu.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net [email protected] https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
Dear all.
I'm going to enhance some features in Linux that could replace highly reliable/available system like mainframe and UNIX. My first interest is Memory hotplug functionality.
Hot remove memory is not only needed for online memory maintenance but also necessary for the dynamic re-partitioning(*) functionality, which many mainframe systems already support.
(*) Memory and CPUs of a system can be divided into several independent sets to form multiple independent computers ("partitioning"). Re-partitioning means moving separation boundary of memory (and CPUs, maybe) to improve resource utilization.
My idea is followings.
- Basically, swap out memory on node which user want to remove.
- Areas which can't be removed is collected to node 0.
- Node 0 is NOT hotpluggable, but other nodes are hotpluggable.
- User area (which is able to be swapped out in many case) allocated at ZONE_HIGHMEM now, so we will make it as follows.
Now
node 0 node 1 node 2
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA ZONE_DMA ZONE_DMA
ZONE_NORMAL ZONE_NORMAL ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM ZONE_HIGHMEM
We want to make like this.
node 0 node 1 node 2
(unhotpluggable) (hotpluggable) (hotpluggable)
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA
ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM
Todo list:
- Pages which without secondary store.
The page caches of virtural file system like sysfs.
- Huge TLB page which cannot be page out.
- Pages which need time to become free.
Pages which are being sent by sendfile, or accessed by NFS.
- DMA mapping area.
- And so on....
I wish I will have comments from anybody.
And,I want to find other appropriate mailing-list
about this discussion if you know.
Best regards.
Signature · 18 lines
Yasunori Goto <ygoto at fsw.fujitsu.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net [email protected] https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
Dear all.
I'm going to enhance some features in Linux that could replace highly reliable/available system like mainframe and UNIX. My first interest is Memory hotplug functionality.
Hot remove memory is not only needed for online memory maintenance but also necessary for the dynamic re-partitioning(*) functionality, which many mainframe systems already support.
(*) Memory and CPUs of a system can be divided into several independent sets to form multiple independent computers ("partitioning"). Re-partitioning means moving separation boundary of memory (and CPUs, maybe) to improve resource utilization.
My idea is followings.
- Basically, swap out memory on node which user want to remove.
- Areas which can't be removed is collected to node 0.
- Node 0 is NOT hotpluggable, but other nodes are hotpluggable.
- User area (which is able to be swapped out in many case) allocated at ZONE_HIGHMEM now, so we will make it as follows.
Now
node 0 node 1 node 2
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA ZONE_DMA ZONE_DMA
ZONE_NORMAL ZONE_NORMAL ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM ZONE_HIGHMEM
We want to make like this.
node 0 node 1 node 2
(unhotpluggable) (hotpluggable) (hotpluggable)
+----------+ +----------+ +----------+
| | | | | |
| |-----------| |----------| |
| | | | | |
+----------+ +----------+ +----------+
ZONE_DMA
ZONE_NORMAL
ZONE_HIGHMEM ZONE_HIGHMEM
Todo list:
- Pages which without secondary store.
The page caches of virtural file system like sysfs.
- Huge TLB page which cannot be page out.
- Pages which need time to become free.
Pages which are being sent by sendfile, or accessed by NFS.
- DMA mapping area.
- And so on....
I wish I will have comments from anybody.
And,I want to find other appropriate mailing-list
about this discussion if you know.
Best regards.
Signature · 18 lines
Yasunori Goto <ygoto at fsw.fujitsu.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net [email protected] https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel