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authorMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-21 11:33:03 +0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-04-21 14:44:55 +0200
commit64131a87f2aae2ed9e05d8227c5b009ca6c50d98 (patch)
treefdea23fd59216120bf54a48c60ca24489a733f14 /Documentation/cgroups
parentMerge branch 'patchwork' into v4l_for_linus (diff)
parentMerge Linus master into drm-next (diff)
downloadlinux-64131a87f2aae2ed9e05d8227c5b009ca6c50d98.tar.xz
linux-64131a87f2aae2ed9e05d8227c5b009ca6c50d98.zip
Merge branch 'drm-next-merged' of git://people.freedesktop.org/~airlied/linux into v4l_for_linus
* 'drm-next-merged' of git://people.freedesktop.org/~airlied/linux: (9717 commits) media-bus: Fixup RGB444_1X12, RGB565_1X16, and YUV8_1X24 media bus format hexdump: avoid warning in test function fs: take i_mutex during prepare_binprm for set[ug]id executables smp: Fix error case handling in smp_call_function_*() iommu-common: Fix PARISC compile-time warnings sparc: Make LDC use common iommu poll management functions sparc: Make sparc64 use scalable lib/iommu-common.c functions Break up monolithic iommu table/lock into finer graularity pools and lock sparc: Revert generic IOMMU allocator. tools/power turbostat: correct dumped pkg-cstate-limit value tools/power turbostat: calculate TSC frequency from CPUID(0x15) on SKL tools/power turbostat: correct DRAM RAPL units on recent Xeon processors tools/power turbostat: Initial Skylake support tools/power turbostat: Use $(CURDIR) instead of $(PWD) and add support for O= option in Makefile tools/power turbostat: modprobe msr, if needed tools/power turbostat: dump MSR_TURBO_RATIO_LIMIT2 tools/power turbostat: use new MSR_TURBO_RATIO_LIMIT names Bluetooth: hidp: Fix regression with older userspace and flags validation config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected perf/x86/intel/pt: Fix and clean up error handling in pt_event_add() ... That solves several merge conflicts: Documentation/DocBook/media/v4l/subdev-formats.xml Documentation/devicetree/bindings/vendor-prefixes.txt drivers/staging/media/mn88473/mn88473.c include/linux/kconfig.h include/uapi/linux/media-bus-format.h The ones at subdev-formats.xml and media-bus-format.h are not trivial. That's why we opted to merge from DRM.
Diffstat (limited to 'Documentation/cgroups')
-rw-r--r--Documentation/cgroups/cpusets.txt10
-rw-r--r--Documentation/cgroups/memory.txt8
-rw-r--r--Documentation/cgroups/unified-hierarchy.txt4
3 files changed, 13 insertions, 9 deletions
diff --git a/Documentation/cgroups/cpusets.txt b/Documentation/cgroups/cpusets.txt
index f2235a162529..fdf7dff3f607 100644
--- a/Documentation/cgroups/cpusets.txt
+++ b/Documentation/cgroups/cpusets.txt
@@ -392,8 +392,10 @@ Put simply, it costs less to balance between two smaller sched domains
than one big one, but doing so means that overloads in one of the
two domains won't be load balanced to the other one.
-By default, there is one sched domain covering all CPUs, except those
-marked isolated using the kernel boot time "isolcpus=" argument.
+By default, there is one sched domain covering all CPUs, including those
+marked isolated using the kernel boot time "isolcpus=" argument. However,
+the isolated CPUs will not participate in load balancing, and will not
+have tasks running on them unless explicitly assigned.
This default load balancing across all CPUs is not well suited for
the following two situations:
@@ -465,6 +467,10 @@ such partially load balanced cpusets, as they may be artificially
constrained to some subset of the CPUs allowed to them, for lack of
load balancing to the other CPUs.
+CPUs in "cpuset.isolcpus" were excluded from load balancing by the
+isolcpus= kernel boot option, and will never be load balanced regardless
+of the value of "cpuset.sched_load_balance" in any cpuset.
+
1.7.1 sched_load_balance implementation details.
------------------------------------------------
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index a22df3ad35ff..f456b4315e86 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -275,11 +275,6 @@ When oom event notifier is registered, event will be delivered.
2.7 Kernel Memory Extension (CONFIG_MEMCG_KMEM)
-WARNING: Current implementation lacks reclaim support. That means allocation
- attempts will fail when close to the limit even if there are plenty of
- kmem available for reclaim. That makes this option unusable in real
- life so DO NOT SELECT IT unless for development purposes.
-
With the Kernel memory extension, the Memory Controller is able to limit
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
@@ -345,6 +340,9 @@ set:
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.
+ WARNING: In the current implementation, memory reclaim will NOT be
+ triggered for a cgroup when it hits K while staying below U, which makes
+ this setup impractical.
U != 0, K >= U:
Since kmem charges will also be fed to the user counter and reclaim will be
diff --git a/Documentation/cgroups/unified-hierarchy.txt b/Documentation/cgroups/unified-hierarchy.txt
index 71daa35ec2d9..eb102fb72213 100644
--- a/Documentation/cgroups/unified-hierarchy.txt
+++ b/Documentation/cgroups/unified-hierarchy.txt
@@ -404,8 +404,8 @@ supported and the interface files "release_agent" and
be understood as an underflow into the highest possible value, -2 or
-10M etc. do not work, so it's not consistent.
- memory.low, memory.high, and memory.max will use the string
- "infinity" to indicate and set the highest possible value.
+ memory.low, memory.high, and memory.max will use the string "max" to
+ indicate and set the highest possible value.
5. Planned Changes