The patch titled mm: add numa node symlink for memory section in sysfs has been added to the -mm tree. Its filename is mm-add-numa-node-symlink-for-memory-section-in-sysfs.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: add numa node symlink for memory section in sysfs From: Alex Chiang <achiang@xxxxxx> Commit c04fc586c (mm: show node to memory section relationship with symlinks in sysfs) created symlinks from nodes to memory sections, e.g. /sys/devices/system/node/node1/memory135 -> ../../memory/memory135 If you're examining the memory section though and are wondering what node it might belong to, you can find it by grovelling around in sysfs, but it's a little cumbersome. Add a reverse symlink for each memory section that points back to the node to which it belongs. Signed-off-by: Alex Chiang <achiang@xxxxxx> Cc: Gary Hade <garyhade@xxxxxxxxxx> Cc: Badari Pulavarty <pbadari@xxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Cc: Greg KH <greg@xxxxxxxxx> Cc: Randy Dunlap <randy.dunlap@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/ABI/testing/sysfs-devices-memory | 14 +++++++++++++- Documentation/memory-hotplug.txt | 11 +++++++---- drivers/base/node.c | 11 ++++++++++- 3 files changed, 30 insertions(+), 6 deletions(-) diff -puN Documentation/ABI/testing/sysfs-devices-memory~mm-add-numa-node-symlink-for-memory-section-in-sysfs Documentation/ABI/testing/sysfs-devices-memory --- a/Documentation/ABI/testing/sysfs-devices-memory~mm-add-numa-node-symlink-for-memory-section-in-sysfs +++ a/Documentation/ABI/testing/sysfs-devices-memory @@ -60,6 +60,19 @@ Description: Users: hotplug memory remove tools https://w3.opensource.ibm.com/projects/powerpc-utils/ + +What: /sys/devices/system/memoryX/nodeY +Date: October 2009 +Contact: Linux Memory Management list <linux-mm@xxxxxxxxx> +Description: + When CONFIG_NUMA is enabled, a symbolic link that + points to the corresponding NUMA node directory. + + For example, the following symbolic link is created for + memory section 9 on node0: + /sys/devices/system/memory/memory9/node0 -> ../../node/node0 + + What: /sys/devices/system/node/nodeX/memoryY Date: September 2008 Contact: Gary Hade <garyhade@xxxxxxxxxx> @@ -70,4 +83,3 @@ Description: memory section directory. For example, the following symbolic link is created for memory section 9 on node0. /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 - diff -puN Documentation/memory-hotplug.txt~mm-add-numa-node-symlink-for-memory-section-in-sysfs Documentation/memory-hotplug.txt --- a/Documentation/memory-hotplug.txt~mm-add-numa-node-symlink-for-memory-section-in-sysfs +++ a/Documentation/memory-hotplug.txt @@ -160,12 +160,15 @@ Under each section, you can see 4 files. NOTE: These directories/files appear after physical memory hotplug phase. -If CONFIG_NUMA is enabled the -/sys/devices/system/memory/memoryXXX memory section -directories can also be accessed via symbolic links located in -the /sys/devices/system/node/node* directories. For example: +If CONFIG_NUMA is enabled the memoryXXX/ directories can also be accessed +via symbolic links located in the /sys/devices/system/node/node* directories. + +For example: /sys/devices/system/node/node0/memory9 -> ../../memory/memory9 +A backlink will also be created: +/sys/devices/system/memory/memory9/node0 -> ../../node/node0 + -------------------------------- 4. Physical memory hot-add phase -------------------------------- diff -puN drivers/base/node.c~mm-add-numa-node-symlink-for-memory-section-in-sysfs drivers/base/node.c --- a/drivers/base/node.c~mm-add-numa-node-symlink-for-memory-section-in-sysfs +++ a/drivers/base/node.c @@ -312,6 +312,7 @@ static int get_nid_for_pfn(unsigned long /* register memory section under specified node if it spans that node */ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) { + int ret; unsigned long pfn, sect_start_pfn, sect_end_pfn; if (!mem_blk) @@ -328,9 +329,15 @@ int register_mem_sect_under_node(struct continue; if (page_nid != nid) continue; - return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, + ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, &mem_blk->sysdev.kobj, kobject_name(&mem_blk->sysdev.kobj)); + if (ret) + return ret; + + return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, + &node_devices[nid].sysdev.kobj, + kobject_name(&node_devices[nid].sysdev.kobj)); } /* mem section does not span the specified node */ return 0; @@ -359,6 +366,8 @@ int unregister_mem_sect_under_nodes(stru continue; sysfs_remove_link(&node_devices[nid].sysdev.kobj, kobject_name(&mem_blk->sysdev.kobj)); + sysfs_remove_link(&mem_blk->sysdev.kobj, + kobject_name(&node_devices[nid].sysdev.kobj)); } return 0; } _ Patches currently in -mm which might be from achiang@xxxxxx are origin.patch linux-next.patch page-types-learn-to-describe-flags-directly-from-command-line.patch page-types-whitespace-alignment.patch page-types-exit-early-when-invoked-with-d-describe.patch mm-add-numa-node-symlink-for-memory-section-in-sysfs.patch mm-refactor-register_cpu_under_node.patch mm-refactor-unregister_cpu_under_node.patch mm-add-numa-node-symlink-for-cpu-devices-in-sysfs.patch documentation-abi-sys-devices-system-cpu-cpu-node.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html