Merge branch 'perf/core' into perf/probes (a7b63425) · Commits · 方亚芬 / raspberrypi_linux

Documentation/ABI/testing/sysfs-devices-cache_disable

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		What: /sys/devices/system/cpu/cpu/cache/index/cache_disable_X
		Date: August 2008
		KernelVersion: 2.6.27
		Contact: mark.langsdorf@amd.com
		Description: These files exist in every cpu's cache index directories.
		There are currently 2 cache_disable_# files in each
		directory. Reading from these files on a supported
		processor will return that cache disable index value
		for that processor and node. Writing to one of these
		files will cause the specificed cache index to be disabled.

		Currently, only AMD Family 10h Processors support cache index
		disable, and only for their L3 caches. See the BIOS and
		Kernel Developer's Guide at
		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
		for formatting information and other details on the
		cache index disable.
		Users: joachim.deguara@amd.com

Documentation/ABI/testing/sysfs-devices-system-cpu

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+156 −0

Original line number	Diff line number	Diff line
		What: /sys/devices/system/cpu/
		Date: pre-git history
		Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
		Description:
		A collection of both global and individual CPU attributes

		Individual CPU attributes are contained in subdirectories
		named by the kernel's logical CPU number, e.g.:

		/sys/devices/system/cpu/cpu#/

		What: /sys/devices/system/cpu/sched_mc_power_savings
		/sys/devices/system/cpu/sched_smt_power_savings
		Date: June 2006
		Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
		Description: Discover and adjust the kernel's multi-core scheduler support.

		Possible values are:

		0 - No power saving load balance (default value)
		1 - Fill one thread/core/package first for long running threads
		2 - Also bias task wakeups to semi-idle cpu package for power
		savings

		sched_mc_power_savings is dependent upon SCHED_MC, which is
		itself architecture dependent.

		sched_smt_power_savings is dependent upon SCHED_SMT, which
		is itself architecture dependent.

		The two files are independent of each other. It is possible
		that one file may be present without the other.

		Introduced by git commit 5c45bf27.


		What: /sys/devices/system/cpu/kernel_max
		/sys/devices/system/cpu/offline
		/sys/devices/system/cpu/online
		/sys/devices/system/cpu/possible
		/sys/devices/system/cpu/present
		Date: December 2008
		Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
		Description: CPU topology files that describe kernel limits related to
		hotplug. Briefly:

		kernel_max: the maximum cpu index allowed by the kernel
		configuration.

		offline: cpus that are not online because they have been
		HOTPLUGGED off or exceed the limit of cpus allowed by the
		kernel configuration (kernel_max above).

		online: cpus that are online and being scheduled.

		possible: cpus that have been allocated resources and can be
		brought online if they are present.

		present: cpus that have been identified as being present in
		the system.

		See Documentation/cputopology.txt for more information.



		What: /sys/devices/system/cpu/cpu#/node
		Date: October 2009
		Contact: Linux memory management mailing list <linux-mm@kvack.org>
		Description: Discover NUMA node a CPU belongs to

		When CONFIG_NUMA is enabled, a symbolic link that points
		to the corresponding NUMA node directory.

		For example, the following symlink is created for cpu42
		in NUMA node 2:

		/sys/devices/system/cpu/cpu42/node2 -> ../../node/node2


		What: /sys/devices/system/cpu/cpu#/topology/core_id
		/sys/devices/system/cpu/cpu#/topology/core_siblings
		/sys/devices/system/cpu/cpu#/topology/core_siblings_list
		/sys/devices/system/cpu/cpu#/topology/physical_package_id
		/sys/devices/system/cpu/cpu#/topology/thread_siblings
		/sys/devices/system/cpu/cpu#/topology/thread_siblings_list
		Date: December 2008
		Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
		Description: CPU topology files that describe a logical CPU's relationship
		to other cores and threads in the same physical package.

		One cpu# directory is created per logical CPU in the system,
		e.g. /sys/devices/system/cpu/cpu42/.

		Briefly, the files above are:

		core_id: the CPU core ID of cpu#. Typically it is the
		hardware platform's identifier (rather than the kernel's).
		The actual value is architecture and platform dependent.

		core_siblings: internal kernel map of cpu#'s hardware threads
		within the same physical_package_id.

		core_siblings_list: human-readable list of the logical CPU
		numbers within the same physical_package_id as cpu#.

		physical_package_id: physical package id of cpu#. Typically
		corresponds to a physical socket number, but the actual value
		is architecture and platform dependent.

		thread_siblings: internel kernel map of cpu#'s hardware
		threads within the same core as cpu#

		thread_siblings_list: human-readable list of cpu#'s hardware
		threads within the same core as cpu#

		See Documentation/cputopology.txt for more information.


		What: /sys/devices/system/cpu/cpuidle/current_driver
		/sys/devices/system/cpu/cpuidle/current_governer_ro
		Date: September 2007
		Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
		Description: Discover cpuidle policy and mechanism

		Various CPUs today support multiple idle levels that are
		differentiated by varying exit latencies and power
		consumption during idle.

		Idle policy (governor) is differentiated from idle mechanism
		(driver)

		current_driver: displays current idle mechanism

		current_governor_ro: displays current idle policy

		See files in Documentation/cpuidle/ for more information.


		What: /sys/devices/system/cpu/cpu/cache/index/cache_disable_X
		Date: August 2008
		KernelVersion: 2.6.27
		Contact: mark.langsdorf@amd.com
		Description: These files exist in every cpu's cache index directories.
		There are currently 2 cache_disable_# files in each
		directory. Reading from these files on a supported
		processor will return that cache disable index value
		for that processor and node. Writing to one of these
		files will cause the specificed cache index to be disabled.

		Currently, only AMD Family 10h Processors support cache index
		disable, and only for their L3 caches. See the BIOS and
		Kernel Developer's Guide at
		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
		for formatting information and other details on the
		cache index disable.
		Users: joachim.deguara@amd.com

Documentation/cputopology.txt

+30 −17

Original line number	Diff line number	Diff line

		Export cpu topology info via sysfs. Items (attributes) are similar
		Export CPU topology info via sysfs. Items (attributes) are similar
		to /proc/cpuinfo.

		1) /sys/devices/system/cpu/cpuX/topology/physical_package_id:
		represent the physical package id of cpu X;

		physical package id of cpuX. Typically corresponds to a physical
		socket number, but the actual value is architecture and platform
		dependent.

		2) /sys/devices/system/cpu/cpuX/topology/core_id:
		represent the cpu core id to cpu X;

		the CPU core ID of cpuX. Typically it is the hardware platform's
		identifier (rather than the kernel's). The actual value is
		architecture and platform dependent.

		3) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
		represent the thread siblings to cpu X in the same core;

		internel kernel map of cpuX's hardware threads within the same
		core as cpuX

		4) /sys/devices/system/cpu/cpuX/topology/core_siblings:
		represent the thread siblings to cpu X in the same physical package;

		internal kernel map of cpuX's hardware threads within the same
		physical_package_id.

		To implement it in an architecture-neutral way, a new source file,
		drivers/base/topology.c, is to export the 4 attributes.
		@@ -32,32 +45,32 @@ not defined by include/asm-XXX/topology.h:
		3) thread_siblings: just the given CPU
		4) core_siblings: just the given CPU

		Additionally, cpu topology information is provided under
		Additionally, CPU topology information is provided under
		/sys/devices/system/cpu and includes these files. The internal
		source for the output is in brackets ("[]").

		kernel_max: the maximum cpu index allowed by the kernel configuration.
		kernel_max: the maximum CPU index allowed by the kernel configuration.
		[NR_CPUS-1]

		offline: cpus that are not online because they have been
		offline: CPUs that are not online because they have been
		HOTPLUGGED off (see cpu-hotplug.txt) or exceed the limit
		of cpus allowed by the kernel configuration (kernel_max
		of CPUs allowed by the kernel configuration (kernel_max
		above). [~cpu_online_mask + cpus >= NR_CPUS]

		online: cpus that are online and being scheduled [cpu_online_mask]
		online: CPUs that are online and being scheduled [cpu_online_mask]

		possible: cpus that have been allocated resources and can be
		possible: CPUs that have been allocated resources and can be
		brought online if they are present. [cpu_possible_mask]

		present: cpus that have been identified as being present in the
		present: CPUs that have been identified as being present in the
		system. [cpu_present_mask]

		The format for the above output is compatible with cpulist_parse()
		[see <linux/cpumask.h>]. Some examples follow.

		In this example, there are 64 cpus in the system but cpus 32-63 exceed
		In this example, there are 64 CPUs in the system but cpus 32-63 exceed
		the kernel max which is limited to 0..31 by the NR_CPUS config option
		being 32. Note also that cpus 2 and 4-31 are not online but could be
		being 32. Note also that CPUs 2 and 4-31 are not online but could be
		brought online as they are both present and possible.

		kernel_max: 31
		@@ -67,8 +80,8 @@ brought online as they are both present and possible.
		present: 0-31

		In this example, the NR_CPUS config option is 128, but the kernel was
		started with possible_cpus=144. There are 4 cpus in the system and cpu2
		was manually taken offline (and is the only cpu that can be brought
		started with possible_cpus=144. There are 4 CPUs in the system and cpu2
		was manually taken offline (and is the only CPU that can be brought
		online.)

		kernel_max: 127
		@@ -78,4 +91,4 @@ online.)
		present: 0-3

		See cpu-hotplug.txt for the possible_cpus=NUM kernel start parameter
		as well as more information on the various cpumask's.
		as well as more information on the various cpumasks.

Documentation/feature-removal-schedule.txt

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Original line number	Diff line number	Diff line
		@@ -418,6 +418,14 @@ When: 2.6.33
		Why: Should be implemented in userspace, policy daemon.
		Who: Johannes Berg <johannes@sipsolutions.net>

		---------------------------

		What: CONFIG_INOTIFY
		When: 2.6.33
		Why: last user (audit) will be converted to the newer more generic
		and more easily maintained fsnotify subsystem
		Who: Eric Paris <eparis@redhat.com>

		----------------------------

		What: lock_policy_rwsem_* and unlock_policy_rwsem_* will not be

Documentation/filesystems/ext4.txt

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Original line number	Diff line number	Diff line
		@@ -134,9 +134,15 @@ ro Mount filesystem read only. Note that ext4 will
		mount options "ro,noload" can be used to prevent
		writes to the filesystem.

		journal_checksum Enable checksumming of the journal transactions.
		This will allow the recovery code in e2fsck and the
		kernel to detect corruption in the kernel. It is a
		compatible change and will be ignored by older kernels.

		journal_async_commit Commit block can be written to disk without waiting
		for descriptor blocks. If enabled older kernels cannot
		mount the device.
		mount the device. This will enable 'journal_checksum'
		internally.

		journal=update Update the ext4 file system's journal to the current
		format.