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/linux/tools/power/cpupower/man/
H A Dcpupower-set.11 .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 \-\-cp
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/linux/Documentation/ABI/testing/
H A Dsysfs-class-scsi_host7 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 Dknfsd-stats.rst5 :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/Documentation/devicetree/bindings/memory-controllers/
H A Dnvidia,tegra20-emc.yaml1 # 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 Dnvidia,tegra30-emc.yaml1 # 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/lib/
H A DKconfig.kasan1 # SPDX-License-Identifier: GPL-2.0-only
23 def_bool $(cc-option, -fsanitize=kernel-address)
26 def_bool $(cc-option, -fsanitize=kernel-hwaddress)
43 Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety
44 error detector designed to find out-of-bounds and use-after-free bugs.
46 See Documentation/dev-tools/kasan.rst for details.
53 …def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=kernel-address -mllvm -asan-kernel-mem-intrinsic-p…
54 (CC_IS_GCC && $(cc-option,-fsanitize=kernel-address --param asan-kernel-mem-intrinsic-prefix=1))
69 2. Software Tag-Based KASAN (arm64 only, based on software memory
72 3. Hardware Tag-Based KASAN (arm64 only, based on hardware memory
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H A DKconfig.debug1 # SPDX-License-Identifier: GPL-2.0-only
19 parameter printk.time=1. See Documentation/admin-guide/kernel-parameters.rst
50 int "Default console loglevel (1-15)"
60 Note: This does not affect the log level of un-prefixed printk()
65 int "quiet console loglevel (1-15)"
76 int "Default message log level (1-7)"
82 This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
118 enabled/disabled based on various levels of scope - per source file,
158 nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
162 nullarbor:~ # echo -n 'file svcsock.c +p' >
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/linux/Documentation/filesystems/xfs/
H A Dxfs-maintainer-entry-profile.rst5 --------
6 XFS is a well known high-performance filesystem in the Linux kernel.
10 Patches are generally merged to the for-next branch of the appropriate
12 After a testing period, the for-next branch is merged to the master
15 Kernel code are merged to the xfs-linux tree[0].
18 Ondisk format documentation are merged to the xfs-documentation tree[3].
21 list linux-xfs@vger.kernel.org.
24 -----
31 - **Outside Contributor**: Anyone who sends a patch but is not involved
36 - **Developer**: Someone who is familiar with the XFS codebase enough to
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/linux/Documentation/admin-guide/pm/
H A Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
5 .. |cpufreq| replace:: :doc:`CPU Performance Scaling <cpufreq>`
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
37 software as individual single-core processors. In other words, a CPU is an
46 Second, if the processor is multi-core, each core in it is able to follow at
61 Finally, each core in a multi-core processor may be able to follow more than one
66 multiple individual single-core "processors", referred to as *hardware threads*
67 (or hyper-threads specifically on Intel hardware), that each can follow one
78 ---------
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/linux/LICENSES/dual/
H A DCC-BY-4.01 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/mm/
H A Dmultigen_lru.rst1 .. 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/admin-guide/
H A Dbcache.rst11 This is the git repository of bcache-tools:
12 https://git.kernel.org/pub/scm/linux/kernel/git/colyli/bcache-tools.git/
17 It's designed around the performance characteristics of SSDs - it only allocates
25 great lengths to protect your data - it reliably handles unclean shutdown. (It
29 Writeback caching can use most of the cache for buffering writes - writing
36 average is above the cutoff it will skip all IO from that task - instead of
47 You'll need bcache util from the bcache-tools repository. Both the cache device
50 bcache make -B /dev/sdb
51 bcache make -C /dev/sdc
53 `bcache make` has the ability to format multiple devices at the same time - if
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/linux/crypto/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
171 bool "Disable run-time self tests"
174 Disable run-time self tests that normally take place at
178 bool "Enable extra run-time crypto self tests"
181 Enable extra run-time self tests of registered crypto algorithms,
247 menu "Public-key cryptography"
250 tristate "RSA (Rivest-Shamir-Adleman)"
257 RSA (Rivest-Shamir-Adleman) public key algorithm (RFC8017)
260 tristate "DH (Diffie-Hellman)"
264 DH (Diffie-Hellman) key exchange algorithm
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/linux/Documentation/admin-guide/sysctl/
H A Dvm.rst13 ------------------------------------------------------------------------------
27 - admin_reserve_kbytes
28 - compact_memory
29 - compaction_proactiveness
30 - compact_unevictable_allowed
31 - dirty_background_bytes
32 - dirty_background_ratio
33 - dirty_bytes
34 - dirty_expire_centisecs
35 - dirty_ratio
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/linux/Documentation/virt/hyperv/
H A Dvpci.rst1 .. 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/drivers/gpu/drm/i915/display/
H A Dintel_pmdemand.c1 // SPDX-License-Identifier: MIT
23 pmdemand_state = kmemdup(obj->state, sizeof(*pmdemand_state), GFP_KERNEL); in intel_pmdemand_duplicate_state()
27 return &pmdemand_state->base; in intel_pmdemand_duplicate_state()
44 struct drm_i915_private *i915 = to_i915(state->base.dev); in intel_atomic_get_pmdemand_state()
47 &i915->display.pmdemand.obj); in intel_atomic_get_pmdemand_state()
58 struct drm_i915_private *i915 = to_i915(state->base.dev); in intel_atomic_get_old_pmdemand_state()
61 &i915->display.pmdemand.obj); in intel_atomic_get_old_pmdemand_state()
72 struct drm_i915_private *i915 = to_i915(state->base.dev); in intel_atomic_get_new_pmdemand_state()
75 &i915->display.pmdemand.obj); in intel_atomic_get_new_pmdemand_state()
89 return -ENOMEM; in intel_pmdemand_init()
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/linux/tools/perf/Documentation/
H A Dperf-report.txt1 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 Dspectre.rst1 .. 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/drivers/gpu/drm/imagination/
H A Dpvr_rogue_fwif.h1 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
42 /* String used in pvrdebug -h output */
140 /* Firmware per-DM HWR states */
155 /* DM was identified as over-running and causing HWR */
157 /* DM was innocently affected by another DM over-running which caused HWR */
270 /* Identify whether MC config is P-P or P-S */
274 /* per-os firmware shared data */
297 /* Firmware trace time-stamp field breakup */
303 /* Extra debug-info (16 bits) */
307 /* Debug-info sub-fields */
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/linux/arch/arm/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
159 The ARM series is a line of low-power-consumption RISC chip designs
161 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
162 manufactured, but legacy ARM-based PC hardware remains popular in
173 supported in LLD until version 14. The combined range is -/+ 256 MiB,
266 Patch phys-to-virt and virt-to-phys translation functions at
270 This can only be used with non-XIP MMU kernels where the base
316 bool "MMU-based Paged Memory Management Support"
319 Select if you want MMU-based virtualised addressing space
354 # This is sorted alphabetically by mach-* pathname. However, plat-*
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/linux/Documentation/dev-tools/kunit/
H A Dusage.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ----------
13 .. code-block:: c
38 .. code-block:: c
59 To learn about more KUnit expectations, see Documentation/dev-tools/kunit/api/test.rst.
69 .. code-block:: c
79 KUNIT_EXPECT_EQ(test, 0, add(-1, 1));
85 KUNIT_EXPECT_EQ(test, -1, add(INT_MAX, INT_MIN));
99 .. code-block:: c
111 for (i = 0; i < TEST_LEN-1; i++)
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/linux/drivers/net/wireless/broadcom/brcm80211/brcmsmac/
H A Dmain.h14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
48 * Usage example, e.g. a three-bit field (bits 4-6):
52 * regval = R_REG(osh, &regs->regfoo);
55 * W_REG(osh, &regs->regfoo, regval);
58 (((unsigned)1 << (width)) - 1)
67 /* max # supported core revisions (0 .. MAXCOREREV - 1) */
76 #define BRCMS_SHORTSLOT_AUTO -1 /* Driver will manage Shortslot setting */
91 #define TXFID_QUEUE_MASK 0x0007 /* Bits 0-2 */
92 #define TXFID_SEQ_MASK 0x7FE0 /* Bits 5-15 */
145 ((uint)((wlc)->band->bandunit ? BAND_2G_INDEX : BAND_5G_INDEX))
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/linux/scripts/
H A Dspelling.txt87 afecting||affecting
1077 none existent||non-existent
1171 peformance||performance
1176 perfomance||performance
1731 vicefersa||vice-versa
/linux/arch/arm64/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
275 ARM 64-bit (AArch64) Linux support.
283 # required due to use of the -Zfixed-x18 flag.
286 # -Zsanitizer=shadow-call-stack flag.
296 depends on $(cc-option,-fpatchable-function-entry=2)
322 # VA_BITS - PAGE_SHIFT - 3
400 def_bool !$(as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n)
405 # https://github.com/llvm/llvm-project/commit/2a96f47c5ffca84cd774ad402cacd137f4bf45e2
455 at stage-2.
463 …bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is acce…
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/linux/arch/x86/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
4 bool "64-bit kernel" if "$(ARCH)" = "x86"
7 Say yes to build a 64-bit kernel - formerly known as x86_64
8 Say no to build a 32-bit kernel - formerly known as i386
13 # Options that are inherently 32-bit kernel only:
27 # Options that are inherently 64-bit kernel only:
55 # ported to 32-bit as well. )
153 # Word-size accesses may read uninitialized data past the trailing \0
332 default "elf32-i386" if X86_32
333 default "elf64-x86-64" if X86_64
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