| /linux/tools/power/cpupower/man/ |
| H A D | cpupower-set.1 | 1 .TH CPUPOWER\-SET "1" "22/02/2011" "" "cpupower Manual"
3 cpupower\-set \- Set processor power related kernel or hardware configurations
6 .B cpupower set [ \-b VAL | \-e POLICY | \-m MODE | \-t BOOL ]
11 registers affecting processor power saving policies.
15 described in the cpupower(1) manpage in the \-\-cpu option section. Whether an
24 \-\-perf-bias, \-b
27 its policy for the relative importance of performance versus energy savings to
30 The range of valid numbers is 0-15, where 0 is maximum
31 performance and 15 is maximum energy efficiency.
33 The processor uses this information in model-specific ways
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| /linux/Documentation/ABI/testing/ |
| H A D | sysfs-class-scsi_host | 7 Storage Control Unit embeds up to two 4-port controllers in
23 stack for a performance advantage when possible. A value of
28 controller wide, affecting all configured logical drives on the
34 Contact: linux-ide@vger.kernel.org
43 performance due to increased latency when coming out of lower
47 Tell the controller to have performance be a priority over power
60 a) It does not use host-initiated slumber mode, but it does
61 allow device-initiated slumber
68 Contact: linux-ide@vger.kernel.org
79 protocol that is being used by the driver (for eg. LED, SAF-TE,
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| /linux/Documentation/filesystems/nfs/ |
| H A D | knfsd-stats.rst | 5 :Authors: Greg Banks <gnb@sgi.com> - 26 Mar 2009
13 program from the nfs-utils distribution provides a helpful command-line
48 packets-arrived
58 However this is a more accurate and less workload-dependent measure
62 sockets-enqueued
68 network-facing work to be done but it couldn't be done immediately,
70 rate of change for this counter is zero; significantly non-zero
71 values may indicate a performance limitation.
74 pool for the NFS workload (the workload is thread-limited), in which
76 performance of the NFS workload.
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| /linux/lib/ |
| H A D | Kconfig.kasan | 1 # SPDX-License-Identifier: GPL-2.0-only
32 compile-time constants for better performance.
35 def_bool $(cc-option, -fsanitize=kernel-address)
38 def_bool $(cc-option, -fsanitize=kernel-hwaddress)
55 Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety
56 error detector designed to find out-of-bounds and use-after-free bugs.
58 See Documentation/dev-tools/kasan.rst for details.
65 …def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=kernel-address -mllvm -asan-kernel-mem-intrinsic-p…
66 (CC_IS_GCC && $(cc-option,-fsanitize=kernel-address --param asan-kernel-mem-intrinsic-prefix=1))
81 2. Software Tag-Based KASAN (arm64 only, based on software memory
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| /linux/Documentation/devicetree/bindings/memory-controllers/ |
| H A D | nvidia,tegra20-emc.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra20-emc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Osipenko <digetx@gmail.com>
11 - Jon Hunter <jonathanh@nvidia.com>
12 - Thierry Reding <thierry.reding@gmail.com>
15 The External Memory Controller (EMC) interfaces with the off-chip SDRAM to
17 various performance-affecting settings beyond the obvious SDRAM configuration
23 const: nvidia,tegra20-emc
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| H A D | nvidia,tegra30-emc.yaml | 1 # SPDX-License-Identifier: (GPL-2.0)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra30-emc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Osipenko <digetx@gmail.com>
11 - Jon Hunter <jonathanh@nvidia.com>
12 - Thierry Reding <thierry.reding@gmail.com>
15 The EMC interfaces with the off-chip SDRAM to service the request stream
16 sent from Memory Controller. The EMC also has various performance-affecting
23 const: nvidia,tegra30-emc
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| /linux/LICENSES/dual/ |
| H A D | CC-BY-4.0 | 1 Valid-License-Identifier: CC-BY-4.0
2 SPDX-URL: https://spdx.org/licenses/CC-BY-4.0
3 Usage-Guide:
6 with a GPL2 compatible license using "OR", as CC-BY-4.0 texts processed by
12 SPDX-License-Identifier: CC-BY-4.0
13 License-Text:
21 Creative Commons public licenses does not create a lawyer-client or
23 information available on an "as-is" basis. Creative Commons gives no
47 material not subject to the license. This includes other CC-
55 the licensor's permission is not necessary for any reason--for
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| /linux/Documentation/process/ |
| H A D | threat-model.rst | 6 (:doc:`security-related ones <security-bugs>` vs :doc:`non-security ones
7 <../admin-guide/reporting-issues>`), and can complicate security enforcement
15 -----------------------------
26 of the Memory Management Unit (MMU), the isolation of DMA-capable peripherals
31 side-channels, hardware response to unexpected inputs), the kernel will usually
32 attempt to implement reasonable mitigations. These are best-effort measures
35 kernel-provided safety guarantee.
42 is performed via configuration (sysctl, file-system permissions etc).
52 * **User-based isolation**: an unprivileged user may restrict access to their
57 * in-memory data (pages are not accessible by default to other users)
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| /linux/Documentation/mm/ |
| H A D | multigen_lru.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 Multi-Gen LRU
6 The multi-gen LRU is an alternative LRU implementation that optimizes
7 page reclaim and improves performance under memory pressure. Page
14 ----------
20 * Simple self-correcting heuristics
23 implementations. In the multi-gen LRU, each generation represents a
25 (time-based) common frame of reference and therefore help make better
41 choices; thus self-correction is necessary.
43 The benefits of simple self-correcting heuristics are self-evident.
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| /linux/Documentation/virt/hyperv/ |
| H A D | vpci.rst | 1 .. SPDX-License-Identifier: GPL-2.0
3 PCI pass-thru devices
5 In a Hyper-V guest VM, PCI pass-thru devices (also called
16 Hyper-V terminology for vPCI devices is "Discrete Device
17 Assignment" (DDA). Public documentation for Hyper-V DDA is
20 …tps://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/plan/plan-for-deploying-devi…
23 and for GPUs. A similar mechanism for NICs is called SR-IOV
25 driver to interact directly with the hardware. See Hyper-V
26 public documentation here: `SR-IOV`_
28 .. _SR-IOV: https://learn.microsoft.com/en-us/windows-hardware/drivers/network/overview-of-single-r…
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| /linux/tools/perf/Documentation/ |
| H A D | perf-report.txt | 1 perf-report(1)
5 ----
6 perf-report - Read perf.data (created by perf record) and display the profile
9 ---
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| /linux/Documentation/admin-guide/hw-vuln/ |
| H A D | spectre.rst | 1 .. SPDX-License-Identifier: GPL-2.0
14 -------------------
17 high performance processors, since most modern high speed processors
22 - Intel Core, Atom, Pentium, and Xeon processors
24 - AMD Phenom, EPYC, and Zen processors
26 - IBM POWER and zSeries processors
28 - Higher end ARM processors
30 - Apple CPUs
32 - Higher end MIPS CPUs
34 - Likely most other high performance CPUs. Contact your CPU vendor for details.
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| /linux/arch/arm/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
50 # https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de
168 The ARM series is a line of low-power-consumption RISC chip designs
170 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
171 manufactured, but legacy ARM-based PC hardware remains popular in
179 relocations. The combined range is -/+ 256 MiB, which is usually
272 Patch phys-to-virt and virt-to-phys translation functions at
276 This can only be used with non-XIP MMU kernels where the base
322 bool "MMU-based Paged Memory Management Support"
325 Select if you want MMU-based virtualised addressing space
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| /linux/drivers/cpufreq/ |
| H A D | cpufreq.c | 1 // SPDX-License-Identifier: GPL-2.0-only
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
9 * Oct 2005 - Ashok Raj <ashok.raj@intel.com>
11 * Feb 2006 - Jacob Shin <jacob.shin@amd.com>
12 * Fix handling for CPU hotplug -- affected CPUs
55 * The "cpufreq driver" - th
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| /linux/scripts/ |
| H A D | spelling.txt | 87 afecting||affecting
1099 none existent||non-existent
1196 peformance||performance
1201 perfomance||performance
1774 vicefersa||vice-versa
|
| /linux/drivers/net/ethernet/sfc/ |
| H A D | efx_common.c | 1 // SPDX-License-Identifier: GPL-2.0-only
104 * queued onto this work queue. This is not a per-nic work queue, because
114 return -ENOMEM; in efx_create_reset_workqueue()
122 queue_work(reset_workqueue, &efx->reset_work); in efx_queue_reset_work()
127 cancel_work_sync(&efx->reset_work); in efx_flush_reset_workqueue()
138 /* We assume that efx->type->reconfigure_mac will always try to sync RX
139 * filters and therefore needs to read-lock the filter table against freeing
143 if (efx->type->reconfigure_mac) { in efx_mac_reconfigure()
144 down_read(&efx->filter_sem); in efx_mac_reconfigure()
145 efx->type->reconfigure_mac(efx, mtu_only); in efx_mac_reconfigure()
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| /linux/drivers/net/ethernet/sfc/siena/ |
| H A D | efx_common.c | 1 // SPDX-License-Identifier: GPL-2.0-only
37 * On Falcon-based NICs, this will:
38 * - Check the on-board hardware monitor;
39 * - Poll the link state and reconfigure the hardware as necessary.
40 * On Siena-based NICs for power systems with EEH support, this will give EEH a
108 * queued onto this work queue. This is not a per-nic work queue, because
118 return -ENOMEM; in efx_siena_create_reset_workqueue()
126 queue_work(reset_workqueue, &efx->reset_work); in efx_siena_queue_reset_work()
131 cancel_work_sync(&efx->reset_work); in efx_siena_flush_reset_workqueue()
142 /* We assume that efx->type->reconfigure_mac will always try to sync RX
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| /linux/include/linux/spi/ |
| H A D | spi.h | 1 /* SPDX-License-Identifier: GPL-2.0-or-later
15 #include <linux/device-id/acpi.h>
16 #include <linux/device-id/of.h>
17 #include <linux/device-id/spi.h>
43 * INTERFACES between SPI controller-side drivers and SPI target protocol handlers,
49 * struct spi_statistics - statistics for spi transfers
50 * @syncp: seqcount to protect members in this struct for per-cpu update
51 * on 32-bit systems
53 * @messages: number of spi-messages handled
102 u64_stats_update_begin(&__lstats->syncp); \
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| /linux/kernel/sched/ |
| H A D | sched.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
128 #define cpu_capacity_span(asym_data) to_cpumask((asym_data)->cpus)
136 * Increase resolution of nice-level calculations for 64-bit architectures.
138 * low-weight task groups (eg. nice +19 on an autogroup), deeper task-group
139 * hierarchies, especially on larger systems. This is not a user-visible change
140 * and does not change the user-interface for setting shares/weights.
143 * resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit
147 * increase coverage and consistency always enable it on 64-bit platforms.
172 * scale_load(sched_prio_to_weight[NICE_TO_PRIO(0)-MAX_RT_PRIO]) == NICE_0_LOAD
179 * 10 -> just above 1us
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| /linux/Documentation/RCU/Design/Data-Structures/ |
| H A D | Data-Structures.rst | 15 Data-Structure Relationships
25 .. kernel-figure:: BigTreeClassicRCU.svg
34 which results in a three-level ``rcu_node`` tree.
38 The purpose of this combining tree is to allow per-CPU events
39 such as quiescent states, dyntick-idle transitions,
42 Quiescent states are recorded by the per-CPU ``rcu_data`` structures,
43 and other events are recorded by the leaf-level ``rcu_node``
54 As can be seen from the diagram, on a 64-bit system
55 a two-level tree with 64 leaves can accommodate 1,024 CPUs, with a fanout
58 +-----------------------------------------------------------------------+
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| /linux/Documentation/admin-guide/ |
| H A D | cgroup-v2.rst | 1 .. _cgroup-v2:
11 conventions of cgroup v2. It describes all userland-visible aspects
14 v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgroup-v1>`.
22 1-1. Terminology
23 1-2. What is cgroup?
25 2-1. Mounting
26 2-2. Organizing Processes and Threads
27 2-2-1. Processes
28 2-2-2. Threads
29 2-3. [Un]populated Notification
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| /linux/drivers/net/ethernet/sfc/falcon/ |
| H A D | efx.c | 1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2005-2013 Solarflare Communications Inc.
84 * queued onto this work queue. This is not a per-nic work queue, because
107 * This is only used in MSI-X interrupt mode
116 * On Falcon-based NICs, this will:
117 * - Check the on-board hardware monitor;
118 * - Poll the link state and reconfigure the hardware as necessary.
119 * On Siena-based NICs for power systems with EEH support, this will give EEH a
128 * round-trip latency and reducing overhead.
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| /linux/mm/ |
| H A D | slub.c | 1 // SPDX-License-Identifier: GPL-2.0
40 #include <linux/fault-inject.h>
48 #include <kunit/test-bug.h>
62 * 2a. kmem_cache->cpu_sheaves->lock (Local trylock)
63 * 2b. barn->lock (Spinlock)
64 * 2c. node->list_lock (Spinlock)
82 * A. slab->freelis
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| /linux/arch/x86/kernel/cpu/ |
| H A D | bugs.c | 1 // SPDX-License-Identifier: GPL-2.0
6 * - Rafael R. Reilova (moved everything from head.S),
8 * - Channing Corn (tests & fixes),
9 * - Andrew D. Balsa (code cleanup).
22 #include <asm/spec-ctrl.h>
26 #include <asm/processor-flags.h>
42 * <vuln>_select_mitigation() -- Selects a mitigation to use. This should
45 * <vuln>_update_mitigation() -- This is called after all vulnerabilities have
49 * <vuln>_apply_mitigation() -- Enable the selected mitigation.
51 * The compile-time mitigation in all cases should be AUTO. An explicit
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| /linux/fs/btrfs/ |
| H A D | scrub.c | 1 // SPDX-License-Identifier: GPL-2.0
12 #include "disk-io.h"
13 #include "ordered-data.h"
17 #include "dev-replace.h"
19 #include "block-group.h"
23 #include "file-item.h"
25 #include "raid-stripe-tree.h"
28 * This is only the first step towards a full-features scrub. It reads all
34 * - In case an unrepairable extent is encountered, track which files are
36 * - track and record media errors, throw out bad devices
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