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r: 347336
b: refs/heads/master
c: 6cb9c36
h: refs/heads/master
v: v3
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Dave Kleikamp authored and David S. Miller committed Dec 18, 2012
1 parent 08766f6 commit bd9cc28
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2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 9eb127cc04c4005c8c0708ce92146d91da862b42
refs/heads/master: 6cb9c3697585c47977c42c5cc1b9fc49247ac530
96 changes: 1 addition & 95 deletions trunk/Documentation/ABI/stable/sysfs-devices-node
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What: /sys/devices/system/node/possible
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that could be possibly become online at some point.

What: /sys/devices/system/node/online
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that are online.

What: /sys/devices/system/node/has_normal_memory
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have regular memory.

What: /sys/devices/system/node/has_cpu
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have one or more CPUs.

What: /sys/devices/system/node/has_high_memory
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have regular or high memory.
Depends on CONFIG_HIGHMEM.

What: /sys/devices/system/node/nodeX
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
When CONFIG_NUMA is enabled, this is a directory containing
information on node X such as what CPUs are local to the
node. Each file is detailed next.

What: /sys/devices/system/node/nodeX/cpumap
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's cpumap.

What: /sys/devices/system/node/nodeX/cpulist
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The CPUs associated to the node.

What: /sys/devices/system/node/nodeX/meminfo
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Provides information about the node's distribution and memory
utilization. Similar to /proc/meminfo, see Documentation/filesystems/proc.txt

What: /sys/devices/system/node/nodeX/numastat
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's hit/miss statistics, in units of pages.
See Documentation/numastat.txt

What: /sys/devices/system/node/nodeX/distance
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Distance between the node and all the other nodes
in the system.

What: /sys/devices/system/node/nodeX/vmstat
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's zoned virtual memory statistics.
This is a superset of numastat.

What: /sys/devices/system/node/nodeX/compact
Date: February 2010
Contact: Mel Gorman <mel@csn.ul.ie>
Description:
When this file is written to, all memory within that node
will be compacted. When it completes, memory will be freed
into blocks which have as many contiguous pages as possible

What: /sys/devices/system/node/nodeX/scan_unevictable_pages
Date: October 2008
Contact: Lee Schermerhorn <lee.schermerhorn@hp.com>
Description:
When set, it triggers scanning the node's unevictable lists
and move any pages that have become evictable onto the respective
zone's inactive list. See mm/vmscan.c

What: /sys/devices/system/node/nodeX/hugepages/hugepages-<size>/
Date: December 2009
Contact: Lee Schermerhorn <lee.schermerhorn@hp.com>
Description:
The node's huge page size control/query attributes.
See Documentation/vm/hugetlbpage.txt
node.
3 changes: 1 addition & 2 deletions trunk/Documentation/ABI/testing/ima_policy
Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,7 @@ Description:
lsm: [[subj_user=] [subj_role=] [subj_type=]
[obj_user=] [obj_role=] [obj_type=]]

base: func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK][MODULE_CHECK]
base: func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK]
mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
fsmagic:= hex value
uid:= decimal value
Expand Down Expand Up @@ -53,7 +53,6 @@ Description:
measure func=BPRM_CHECK
measure func=FILE_MMAP mask=MAY_EXEC
measure func=FILE_CHECK mask=MAY_READ uid=0
measure func=MODULE_CHECK uid=0
appraise fowner=0

The default policy measures all executables in bprm_check,
Expand Down
66 changes: 1 addition & 65 deletions trunk/Documentation/cgroups/memory.txt
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Expand Up @@ -71,11 +71,6 @@ Brief summary of control files.
memory.oom_control # set/show oom controls.
memory.numa_stat # show the number of memory usage per numa node

memory.kmem.limit_in_bytes # set/show hard limit for kernel memory
memory.kmem.usage_in_bytes # show current kernel memory allocation
memory.kmem.failcnt # show the number of kernel memory usage hits limits
memory.kmem.max_usage_in_bytes # show max kernel memory usage recorded

memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation
memory.kmem.tcp.failcnt # show the number of tcp buf memory usage hits limits
Expand Down Expand Up @@ -273,73 +268,20 @@ the amount of kernel memory used by the system. Kernel memory is fundamentally
different than user memory, since it can't be swapped out, which makes it
possible to DoS the system by consuming too much of this precious resource.

Kernel memory won't be accounted at all until limit on a group is set. This
allows for existing setups to continue working without disruption. The limit
cannot be set if the cgroup have children, or if there are already tasks in the
cgroup. Attempting to set the limit under those conditions will return -EBUSY.
When use_hierarchy == 1 and a group is accounted, its children will
automatically be accounted regardless of their limit value.

After a group is first limited, it will be kept being accounted until it
is removed. The memory limitation itself, can of course be removed by writing
-1 to memory.kmem.limit_in_bytes. In this case, kmem will be accounted, but not
limited.

Kernel memory limits are not imposed for the root cgroup. Usage for the root
cgroup may or may not be accounted. The memory used is accumulated into
memory.kmem.usage_in_bytes, or in a separate counter when it makes sense.
(currently only for tcp).
The main "kmem" counter is fed into the main counter, so kmem charges will
also be visible from the user counter.
cgroup may or may not be accounted.

Currently no soft limit is implemented for kernel memory. It is future work
to trigger slab reclaim when those limits are reached.

2.7.1 Current Kernel Memory resources accounted

* stack pages: every process consumes some stack pages. By accounting into
kernel memory, we prevent new processes from being created when the kernel
memory usage is too high.

* slab pages: pages allocated by the SLAB or SLUB allocator are tracked. A copy
of each kmem_cache is created everytime the cache is touched by the first time
from inside the memcg. The creation is done lazily, so some objects can still be
skipped while the cache is being created. All objects in a slab page should
belong to the same memcg. This only fails to hold when a task is migrated to a
different memcg during the page allocation by the cache.

* sockets memory pressure: some sockets protocols have memory pressure
thresholds. The Memory Controller allows them to be controlled individually
per cgroup, instead of globally.

* tcp memory pressure: sockets memory pressure for the tcp protocol.

2.7.3 Common use cases

Because the "kmem" counter is fed to the main user counter, kernel memory can
never be limited completely independently of user memory. Say "U" is the user
limit, and "K" the kernel limit. There are three possible ways limits can be
set:

U != 0, K = unlimited:
This is the standard memcg limitation mechanism already present before kmem
accounting. Kernel memory is completely ignored.

U != 0, K < U:
Kernel memory is a subset of the user memory. This setup is useful in
deployments where the total amount of memory per-cgroup is overcommited.
Overcommiting kernel memory limits is definitely not recommended, since the
box can still run out of non-reclaimable memory.
In this case, the admin could set up K so that the sum of all groups is
never greater than the total memory, and freely set U at the cost of his
QoS.

U != 0, K >= U:
Since kmem charges will also be fed to the user counter and reclaim will be
triggered for the cgroup for both kinds of memory. This setup gives the
admin a unified view of memory, and it is also useful for people who just
want to track kernel memory usage.

3. User Interface

0. Configuration
Expand All @@ -348,7 +290,6 @@ a. Enable CONFIG_CGROUPS
b. Enable CONFIG_RESOURCE_COUNTERS
c. Enable CONFIG_MEMCG
d. Enable CONFIG_MEMCG_SWAP (to use swap extension)
d. Enable CONFIG_MEMCG_KMEM (to use kmem extension)

1. Prepare the cgroups (see cgroups.txt, Why are cgroups needed?)
# mount -t tmpfs none /sys/fs/cgroup
Expand Down Expand Up @@ -465,11 +406,6 @@ About use_hierarchy, see Section 6.
Because rmdir() moves all pages to parent, some out-of-use page caches can be
moved to the parent. If you want to avoid that, force_empty will be useful.

Also, note that when memory.kmem.limit_in_bytes is set the charges due to
kernel pages will still be seen. This is not considered a failure and the
write will still return success. In this case, it is expected that
memory.kmem.usage_in_bytes == memory.usage_in_bytes.

About use_hierarchy, see Section 6.

5.2 stat file
Expand Down
7 changes: 3 additions & 4 deletions trunk/Documentation/cgroups/resource_counter.txt
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Expand Up @@ -83,17 +83,16 @@ to work with it.
res_counter->lock internally (it must be called with res_counter->lock
held). The force parameter indicates whether we can bypass the limit.

e. u64 res_counter_uncharge[_locked]
e. void res_counter_uncharge[_locked]
(struct res_counter *rc, unsigned long val)

When a resource is released (freed) it should be de-accounted
from the resource counter it was accounted to. This is called
"uncharging". The return value of this function indicate the amount
of charges still present in the counter.
"uncharging".

The _locked routines imply that the res_counter->lock is taken.

f. u64 res_counter_uncharge_until
f. void res_counter_uncharge_until
(struct res_counter *rc, struct res_counter *top,
unsinged long val)

Expand Down
8 changes: 0 additions & 8 deletions trunk/Documentation/devicetree/bindings/arm/davinci/nand.txt
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Expand Up @@ -23,9 +23,6 @@ Recommended properties :
- ti,davinci-nand-buswidth: buswidth 8 or 16
- ti,davinci-nand-use-bbt: use flash based bad block table support.

nand device bindings may contain additional sub-nodes describing
partitions of the address space. See partition.txt for more detail.

Example(da850 EVM ):
nand_cs3@62000000 {
compatible = "ti,davinci-nand";
Expand All @@ -38,9 +35,4 @@ nand_cs3@62000000 {
ti,davinci-ecc-mode = "hw";
ti,davinci-ecc-bits = <4>;
ti,davinci-nand-use-bbt;

partition@180000 {
label = "ubifs";
reg = <0x180000 0x7e80000>;
};
};
27 changes: 0 additions & 27 deletions trunk/Documentation/devicetree/bindings/i2c/i2c-cbus-gpio.txt

This file was deleted.

81 changes: 0 additions & 81 deletions trunk/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt

This file was deleted.

2 changes: 1 addition & 1 deletion trunk/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
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Device tree configuration for i2c-ocores

Required properties:
- compatible : "opencores,i2c-ocores" or "aeroflexgaisler,i2cmst"
- compatible : "opencores,i2c-ocores"
- reg : bus address start and address range size of device
- interrupts : interrupt number
- clock-frequency : frequency of bus clock in Hz
Expand Down
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