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/linux/Documentation/admin-guide/mm/
H A Dnumaperf.rst13 A system supports such heterogeneous memory by grouping each memory type
21 +------------------+ +------------------+
22 | Compute Node 0 +-----+ Compute Node 1 |
24 +--------+---------+ +--------+---------+
26 +--------+---------+ +--------+---------+
28 +------------------+ +--------+---------+
36 performance when accessing a given memory target. Each initiator-target
48 # symlinks -v /sys/devices/system/node/nodeX/access0/targets/
49 relative: /sys/devices/system/node/nodeX/access0/targets/nodeY -> ../../nodeY
51 # symlinks -v /sys/devices/system/node/nodeY/access0/initiators/
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H A Dconcepts.rst5 The memory management in Linux is a complex system that evolved over the
7 systems from MMU-less microcontrollers to supercomputers. The memory
19 The physical memory in a computer system is a limited resource and
37 writes) from (or to) the system memory, it translates the `virtual`
41 The physical system memory is divided into page frames, or pages. The
52 The tables at the lowest level of the hierarchy contain physical
55 levels. The pointer to the top level page table resides in a
57 register to access the top level page table. The high bits of the
58 virtual address are used to index an entry in the top level page
59 table. That entry is then used to access the next level in the
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/linux/Documentation/devicetree/bindings/cache/
H A Dsocionext,uniphier-system-cache.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/cache/socionext,uniphier-system-cache.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 UniPhier ARM 32-bit SoCs are integrated with a full-custom outer cache
11 controller system. All of them have a level 2 cache controller, and some
12 have a level 3 cache controller as well.
15 - Masahiro Yamada <yamada.masahiro@socionext.com>
19 const: socionext,uniphier-system-cache
35 cache-unified: true
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/linux/drivers/scsi/esas2r/
H A Desas2r_log.c5 * Copyright (c) 2001-2013 ATTO Technology, Inc.
21 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
40 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
48 * the event_log_level module parameter controls the level of messages that are
49 * written to the system log. the default level of messages that are written
57 * to the system log. if critical, warning, and information-level messages are
70 …"Specifies the level of events to report to the system log. Critical and warning level events are…
79 * translates an esas2r-defined logging event level to a kernel logging level.
81 * @param [in] level the esas2r-defined logging event level to translate
83 * @return the corresponding kernel logging level.
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/linux/include/linux/fs/
H A Dsuper.h1 /* SPDX-License-Identifier: GPL-2.0 */
12 static inline void __sb_end_write(struct super_block *sb, int level) in __sb_end_write() argument
14 percpu_up_read(sb->s_writers.rw_sem + level - 1); in __sb_end_write()
17 static inline void __sb_start_write(struct super_block *sb, int level) in __sb_start_write() argument
19 percpu_down_read_freezable(sb->s_writers.rw_sem + level - 1, true); in __sb_start_write()
22 static inline bool __sb_start_write_trylock(struct super_block *sb, int level) in __sb_start_write_trylock() argument
24 return percpu_down_read_trylock(sb->s_writers.rw_sem + level - 1); in __sb_start_write_trylock()
28 percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev) - 1], 1, _THIS_IP_)
30 percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev) - 1], _THIS_IP_)
33 * __sb_write_started - check if sb freeze level is held
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/linux/drivers/firmware/imx/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
18 The System Controller Firmware (SCFW) is a low-level system function
19 which runs on a dedicated Cortex-M core to provide power, clock, and
31 The System Controller Management Interface firmware (SCMI FW) is
32 a low-level system function which runs on a dedicated Cortex-M
42 The System Controller Management Interface firmware (SCMI FW) is
43 a low-level system function which runs on a dedicated Cortex-M
53 The System Controller Management Interface firmware (SCMI FW) is
54 a low-level system function which runs on a dedicated Cortex-M
/linux/Documentation/admin-guide/thermal/
H A Dintel_powerclamp.rst6 - Arjan van de Ven <arjan@linux.intel.com>
7 - Jacob Pan <jacob.jun.pan@linux.intel.com>
12 - Goals and Objectives
15 - Idle Injection
16 - Calibration
19 - Effectiveness and Limitations
20 - Power vs Performance
21 - Scalability
22 - Calibration
23 - Comparison with Alternative Techniques
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/linux/Documentation/admin-guide/pm/
H A Dintel-speed-select.rst1 .. SPDX-License-Identifier: GPL-2.0
14 - https://www.intel.com/content/www/us/en/architecture-and-technology/speed-select-technology-artic…
15 - https://builders.intel.com/docs/networkbuilders/intel-speed-select-technology-base-frequency-enha…
19 dynamically without pre-configuring via BIOS setup options. This dynamic
25 how these commands change the power and performance profile of the system under
29 intel-speed-select configuration tool
32 Most Linux distribution packages may include the "intel-speed-select" tool. If not,
38 # cd tools/power/x86/intel-speed-select/
43 ------------
47 # intel-speed-select --help
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H A Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
5 System Sleep States
13 Sleep states are global low-power states of the entire system in which user
14 space code cannot be executed and the overall system activity is significantly
22 the Linux kernel can support up to four system sleep states, including
23 hibernation and up to three variants of system suspend. The sleep states that
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
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/linux/tools/perf/Documentation/
H A Dperf-stat.txt1 perf-stat(1)
5 ----
6 perf-stat - Run a command and gather performance counter statistics
9 --------
11 'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
12 'perf stat' [-e <EVENT> | --event=EVENT] [-a] \-- <command> [<options>]
13 'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] \-- <command> [<options>]
14 'perf stat' report [-i file]
17 -----------
23 -------
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/linux/fs/ubifs/
H A Dtnc_misc.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2006-2008 Nokia Corporation.
12 * This file contains miscelanious TNC-related functions shared betweend
14 * sub-system. The file was created because there is a lot of TNC code and
21 * ubifs_tnc_levelorder_next - next TNC tree element in levelorder traversal.
22 * @c: UBIFS file-system description object
33 int level, iip, level_search = 0; in ubifs_tnc_levelorder_next() local
42 if (znode->level == 0) in ubifs_tnc_levelorder_next()
47 level = znode->level; in ubifs_tnc_levelorder_next()
49 iip = znode->iip; in ubifs_tnc_levelorder_next()
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H A Dtnc.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2006-2008 Nokia Corporation.
13 * the UBIFS B-tree.
53 p = &c->old_idx.rb_node; in do_insert_old_idx()
57 if (old_idx->lnum < o->lnum) in do_insert_old_idx()
58 p = &(*p)->rb_left; in do_insert_old_idx()
59 else if (old_idx->lnum > o->lnum) in do_insert_old_idx()
60 p = &(*p)->rb_right; in do_insert_old_idx()
61 else if (old_idx->offs < o->offs) in do_insert_old_idx()
62 p = &(*p)->rb_left; in do_insert_old_idx()
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/linux/Documentation/filesystems/
H A Dqnx6.rst1 .. SPDX-License-Identifier: GPL-2.0
7 The qnx6fs is used by newer QNX operating system versions. (e.g. Neutrino)
13 mmi_fs Mount filesystem as used for example by Audi MMI 3G system
29 ------
39 ---------------
57 If the level value is 0, up to 16 direct blocks can be addressed by each
60 Level 1 adds an additional indirect addressing level where each indirect
62 Level 2 adds an additional indirect addressing block level (so, already up
65 Unused block pointers are always set to ~0 - regardless of root node,
68 Data leaves are always on the lowest level. So no data is stored on upper
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/linux/arch/sh/boards/mach-dreamcast/
H A Dirq.c1 // SPDX-License-Identifier: GPL-2.0
18 * Dreamcast System ASIC Hardware Events -
20 * The Dreamcast's System ASIC (a.k.a. Holly) is responsible for receiving
21 * hardware events from system peripherals and triggering an SH7750 IRQ.
28 * There are three 32-bit ESRs located at 0xa05f6900 - 0xa05f6908. Event
29 * types can be found in arch/sh/include/mach-dreamcast/mach/sysasic.h.
31 * corresponds to an IRQ, so 0xa05f6910 - 0xa05f6918 triggers IRQ 13,
32 * 0xa05f6920 - 0xa05f6928 triggers IRQ 11, and 0xa05f6930 - 0xa05f6938
39 * 6900/6910 - Events 0-31, IRQ 13
40 * 6904/6924 - Events 32-63, IRQ 11
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/linux/Documentation/devicetree/bindings/pinctrl/
H A Dsprd,sc9860-pinctrl.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/pinctrl/sprd,sc9860-pinctrl.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Baolin Wang <baolin.wang@linux.alibaba.com>
18 pad driving level, system control select and so on ("domain pad
19 driving level": One pin can output 3.0v or 1.8v, depending on the
21 select 3.0v, then the pin can output 3.0v. "system control" is used
22 to choose one function (like: UART0) for which system, since we
26 of them, so we can not make every Spreadtrum-special configuration
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/linux/Documentation/arch/x86/
H A Dtopology.rst1 .. SPDX-License-Identifier: GPL-2.0
11 The architecture-agnostic topology definitions are in
12 Documentation/admin-guide/cputopology.rst. This file holds x86-specific
17 Needless to say, code should use the generic functions - this file is *only*
23 code which needs to know/query/use the structure of the running system wrt
33 The topology of a system is described in the units of:
35 - packages
36 - cores
37 - threads
48 Package-related topology information in the kernel:
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/linux/drivers/s390/char/
H A Dsclp_cpi_sys.c1 // SPDX-License-Identifier: GPL-2.0
86 return ERR_PTR(-ENOMEM); in cpi_prepare_req()
90 return ERR_PTR(-ENOMEM); in cpi_prepare_req()
93 /* setup SCCB for Control-Program Identification */ in cpi_prepare_req()
94 sccb->header.length = sizeof(struct cpi_sccb); in cpi_prepare_req()
95 sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); in cpi_prepare_req()
96 sccb->cpi_evbuf.header.type = EVTYP_CTLPROGIDENT; in cpi_prepare_req()
97 evb = &sccb->cpi_evbuf; in cpi_prepare_req()
99 /* set system type */ in cpi_prepare_req()
100 set_data(evb->system_type, system_type); in cpi_prepare_req()
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/linux/Documentation/networking/device_drivers/ethernet/intel/
H A De100.rst1 .. SPDX-License-Identifier: GPL-2.0+
12 - In This Release
13 - Identifying Your Adapter
14 - Building and Installation
15 - Driver Configuration Parameters
16 - Additional Configurations
17 - Known Issues
18 - Support
25 Adapters. This driver includes support for Itanium(R)2-based systems.
31 - Native VLANs
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/linux/arch/arm/boot/dts/broadcom/
H A Dbcm2837.dtsi2 #include "bcm2835-common.dtsi"
10 dma-ranges = <0xc0000000 0x00000000 0x3f000000>;
12 local_intc: interrupt-controller@40000000 {
13 compatible = "brcm,bcm2836-l1-intc";
15 interrupt-controller;
16 #interrupt-cells = <2>;
17 interrupt-parent = <&local_intc>;
21 arm-pmu {
22 compatible = "arm,cortex-a53-pmu";
23 interrupt-parent = <&local_intc>;
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/linux/net/netlabel/
H A Dnetlabel_cipso_v4.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5 * This file defines the CIPSO/IPv4 functions for the NetLabel system. The
6 * NetLabel system manages static and dynamic label mappings for network
9 * Author: Paul Moore <paul@paul-moore.com>
13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
43 * CIPSO V4 system.
75 * system. When sent by an application there is no payload and the
117 * the local MLS sensitivity level */
120 * the remote MLS sensitivity level */
123 * a MLS sensitivity level mapping, must contain only one attribute of
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/linux/fs/jfs/
H A Djfs_dmap.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) International Business Machines Corp., 2000-2004
25 * level and move up through the dmap control pages (i.e.
29 * level and work down towards the dmaps.
35 * as it works it way up from a single dmap to the required level
41 * take the lock in read mode. a single top-down request may proceed
42 * exclusively while multiple bottoms-up requests may proceed
48 * free block count, allocation group level free block counts).
50 * in the face of multiple-bottoms up requests.
57 #define BMAP_LOCK_INIT(bmp) mutex_init(&bmp->db_bmaplock)
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/linux/tools/perf/pmu-events/arch/arm64/ampere/ampereonex/
H A Dcore-imp-def.json3 "PublicDescription": "Level 2 prefetch requests, refilled to L2 cache",
6 "BriefDescription": "Level 2 prefetch requests, refilled to L2 cache"
9 "PublicDescription": "Level 2 prefetch requests, late",
12 "BriefDescription": "Level 2 prefetch requests, late"
15 "PublicDescription": "Predictable branch speculatively executed that hit any level of BTB",
18 "BriefDescription": "Predictable branch speculatively executed that hit any level of BTB"
21 …licDescription": "Predictable conditional branch speculatively executed that hit any level of BTB",
24 …riefDescription": "Predictable conditional branch speculatively executed that hit any level of BTB"
27 …"PublicDescription": "Predictable taken branch speculatively executed that hit any level of BTB th…
30 …"BriefDescription": "Predictable taken branch speculatively executed that hit any level of BTB tha…
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/linux/tools/perf/pmu-events/arch/arm64/arm/neoverse-v1/
H A Dl1d_cache.json4 …Description": "Counts level 1 data cache refills caused by speculatively executed load or store op…
8 …level 1 data cache accesses from any load/store operations. Atomic operations that resolve in the …
12 …-backs of dirty data from the L1 data cache to the L2 cache. This occurs when either a dirty cache…
16 …"PublicDescription": "Counts cache line refills into the level 1 data cache from any memory read o…
20 …"PublicDescription": "Counts level 1 data cache accesses from any load operation. Atomic load oper…
24 …"PublicDescription": "Counts level 1 data cache accesses generated by store operations. This event…
28 …n": "Counts level 1 data cache refills caused by speculatively executed load instructions where th…
32 …": "Counts level 1 data cache refills caused by speculatively executed store instructions where th…
36 …"PublicDescription": "Counts level 1 data cache refills where the cache line data came from caches…
40 … "Counts level 1 data cache refills for which the cache line data came from outside the immediate …
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/linux/Documentation/netlabel/
H A Ddraft-ietf-cipso-ipsecurity-01.txt12 This Internet Draft provides the high level specification for a Commercial
27 Please check the I-D abstract listing contained in each Internet Draft
46 mandatory access controls and multi-level security. These systems are
88 once in a datagram. All multi-octet fields in the option are defined to be
91 +----------+----------+------//------+-----------//---------+
93 +----------+----------+------//------+-----------//---------+
124 corresponding ASCII representations. Non-related groups of systems may
138 number 1 to represent that same security level. The DOI identifier is used
148 actual security information to be passed. All multi-octet fields in a tag
171 +----------+----------+--------//--------+
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/linux/Documentation/admin-guide/LSM/
H A DSmack.rst7 - The Elevator, from Dark Star
21 - The kernel
22 - Basic utilities, which are helpful but not required
23 - Configuration data
35 Smack is used in the Tizen operating system. Please
41 git://github.com/smack-team/smack.git
120 # attr -S -s SMACK64 -V "value" path
121 # chsmack -a value path
128 in the smackfs filesystem. This pseudo-filesystem is mounted
153 change-rule
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