android_kernel_xiaomi_sm8350/drivers
Gary Hade c04fc586c1 mm: show node to memory section relationship with symlinks in sysfs
Show node to memory section relationship with symlinks in sysfs

Add /sys/devices/system/node/nodeX/memoryY symlinks for all
the memory sections located on nodeX.  For example:
/sys/devices/system/node/node1/memory135 -> ../../memory/memory135
indicates that memory section 135 resides on node1.

Also revises documentation to cover this change as well as updating
Documentation/ABI/testing/sysfs-devices-memory to include descriptions
of memory hotremove files 'phys_device', 'phys_index', and 'state'
that were previously not described there.

In addition to it always being a good policy to provide users with
the maximum possible amount of physical location information for
resources that can be hot-added and/or hot-removed, the following
are some (but likely not all) of the user benefits provided by
this change.
Immediate:
  - Provides information needed to determine the specific node
    on which a defective DIMM is located.  This will reduce system
    downtime when the node or defective DIMM is swapped out.
  - Prevents unintended onlining of a memory section that was
    previously offlined due to a defective DIMM.  This could happen
    during node hot-add when the user or node hot-add assist script
    onlines _all_ offlined sections due to user or script inability
    to identify the specific memory sections located on the hot-added
    node.  The consequences of reintroducing the defective memory
    could be ugly.
  - Provides information needed to vary the amount and distribution
    of memory on specific nodes for testing or debugging purposes.
Future:
  - Will provide information needed to identify the memory
    sections that need to be offlined prior to physical removal
    of a specific node.

Symlink creation during boot was tested on 2-node x86_64, 2-node
ppc64, and 2-node ia64 systems.  Symlink creation during physical
memory hot-add tested on a 2-node x86_64 system.

Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-06 15:59:00 -08:00
..
accessibility
acpi cpumask: convert shared_cpu_map in acpi_processor* structs to cpumask_var_t 2009-01-03 19:15:40 +01:00
amba
ata Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-12-30 17:43:10 -08:00
atm
auxdisplay
base mm: show node to memory section relationship with symlinks in sysfs 2009-01-06 15:59:00 -08:00
block Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2008-12-30 17:37:25 -08:00
bluetooth
cdrom
char sparseirq: move set/get_timer_rand_state back to .c 2009-01-03 12:01:23 -08:00
clocksource Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
connector
cpufreq
cpuidle
crypto
dca
dio
dma
edac
eisa
firewire
firmware
gpio
gpu
hid Merge branch 'upstream-fixes' into for-next 2009-01-04 01:04:09 +01:00
hwmon
i2c Merge branch 'for-next' of git://git.o-hand.com/linux-mfd 2009-01-05 19:04:09 -08:00
ide ide-atapi: start dma in a drive-specific way 2009-01-02 16:12:56 +01:00
idle
ieee1394
infiniband zero i_uid/i_gid on inode allocation 2009-01-05 11:54:28 -05:00
input Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-12-30 17:36:49 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-01-05 18:44:59 -08:00
leds
lguest Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask into merge-rr-cpumask 2009-01-03 18:53:31 +01:00
macintosh
mca
md dm snapshot: extend exception store functions 2009-01-06 03:05:19 +00:00
media V4L/DVB (10173): Missing v4l2_prio_close in radio_release 2009-01-03 10:50:38 -02:00
memstick
message i2o: Update my address 2009-01-05 18:28:04 -08:00
mfd mfd: Fix section mismatch in da903x 2009-01-04 15:31:49 +01:00
misc zero i_uid/i_gid on inode allocation 2009-01-05 11:54:28 -05:00
mmc Merge branch 'master' of ../mmc 2008-12-31 19:56:05 +01:00
mtd Merge branch 'linux-next' of git://git.infradead.org/~dedekind/ubi-2.6 2009-01-02 15:57:26 -08:00
net igb: fix anoying type mismatch warning on rx/tx queue sizing 2009-01-05 18:47:12 -08:00
nubus
of
oprofile zero i_uid/i_gid on inode allocation 2009-01-05 11:54:28 -05:00
parisc Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
parport
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu 2009-01-03 12:03:52 -08:00
pcmcia
pnp percpu: fix percpu accessors to potentially !cpu_possible() cpus: pnpbios 2009-01-01 10:12:14 +10:30
power power_supply: Add Dialog DA9030 battery charger driver 2009-01-04 12:17:41 +01:00
ps3
rapidio
regulator mfd: Support configurable numbers of DCDCs and ISINKs on WM8350 2009-01-04 12:17:42 +01:00
rtc rtc: add alarm/update irq interfaces 2009-01-04 13:33:20 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-01-05 18:44:59 -08:00
sbus
scsi remove ide-scsi 2009-01-02 16:12:51 +01:00
serial serial_8250: support for Sealevel Systems Model 7803 COMM+8 2009-01-02 10:19:44 -08:00
sh
sn
spi
ssb
staging
tc
telephony
thermal
uio
usb add a vfs_fsync helper 2009-01-05 11:54:28 -05:00
uwb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-upstream 2009-01-02 13:17:13 +00:00
video viafb: fix crashes due to 4k stack overflow 2009-01-04 13:33:20 -08:00
virtio
w1
watchdog [WATCHDOG] Add support for the WM8350 watchdog 2008-12-31 16:12:54 +00:00
xen Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
zorro
Kconfig
Makefile