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/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/cortex-a55/
Dpipeline.json9 …rontend, cache miss.This event counts every cycle the DPU IQ is empty and there is an instruction …
12 …rontend, cache miss.This event counts every cycle the DPU IQ is empty and there is an instruction …
15 … frontend, TLB miss.This event counts every cycle the DPU IQ is empty and there is an instruction …
18 … frontend, TLB miss.This event counts every cycle the DPU IQ is empty and there is an instruction …
21 …d, pre-decode error.This event counts every cycle the DPU IQ is empty and there is a pre-decode er…
24 …d, pre-decode error.This event counts every cycle the DPU IQ is empty and there is a pre-decode er…
27 …backend interlock.This event counts every cycle that issue is stalled and there is an interlock. S…
30 …backend interlock.This event counts every cycle that issue is stalled and there is an interlock. S…
33 …d, interlock, AGU.This event counts every cycle that issue is stalled and there is an interlock th…
36 …d, interlock, AGU.This event counts every cycle that issue is stalled and there is an interlock th…
[all …]
/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/cortex-a510/
Dpipeline.json21 … cycle that the Data Processing Unit (DPU) instruction queue is empty and there is an instruction …
24 … cycle that the Data Processing Unit (DPU) instruction queue is empty and there is an instruction …
27 …This event counts every cycle that the DPU instruction queue is empty and there is an instruction …
30 …This event counts every cycle that the DPU instruction queue is empty and there is an instruction …
39 …s event counts every cycle where the issue of an operation is stalled and there is an interlock. S…
42 …s event counts every cycle where the issue of an operation is stalled and there is an interlock. S…
45 …s event counts every cycle where the issue of an operation is stalled and there is an interlock on…
48 …s event counts every cycle where the issue of an operation is stalled and there is an interlock on…
51 … or the Vector Processing Unit (VPU). This event counts every cycle where there is a stall or an i…
54 … or the Vector Processing Unit (VPU). This event counts every cycle where there is a stall or an i…
[all …]
/linux-6.12.1/include/linux/atomic/
Datomic-instrumented.h25 * Unsafe to use in noinstr code; use raw_atomic_read() there.
42 * Unsafe to use in noinstr code; use raw_atomic_read_acquire() there.
60 * Unsafe to use in noinstr code; use raw_atomic_set() there.
78 * Unsafe to use in noinstr code; use raw_atomic_set_release() there.
97 * Unsafe to use in noinstr code; use raw_atomic_add() there.
115 * Unsafe to use in noinstr code; use raw_atomic_add_return() there.
134 * Unsafe to use in noinstr code; use raw_atomic_add_return_acquire() there.
152 * Unsafe to use in noinstr code; use raw_atomic_add_return_release() there.
171 * Unsafe to use in noinstr code; use raw_atomic_add_return_relaxed() there.
189 * Unsafe to use in noinstr code; use raw_atomic_fetch_add() there.
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/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/cortex-a53/
Dpipeline.json15 …"BriefDescription": "Cycles the DPU IQ is empty and there is an instruction cache miss being proce…
20 …"BriefDescription": "Cycles the DPU IQ is empty and there is an instruction micro-TLB miss being p…
25 "BriefDescription": "Cycles the DPU IQ is empty and there is a pre-decode error being processed"
30 …"BriefDescription": "Cycles there is an interlock other than Advanced SIMD/Floating-point instruc…
35 …"BriefDescription": "Cycles there is an interlock for a load/store instruction waiting for data to…
40 … "BriefDescription": "Cycles there is an interlock for an Advanced SIMD/Floating-point operation."
45 "BriefDescription": "Cycles there is a stall in the Wr stage because of a load miss"
50 "BriefDescription": "Cycles there is a stall in the Wr stage because of a store"
/linux-6.12.1/Documentation/locking/
Drobust-futexes.rst18 that says "there's a waiter pending", and the sys_futex(FUTEX_WAIT)
23 value) that there were waiter(s) pending, and does the
26 state, and there's no in-kernel state associated with it. The kernel
27 completely forgets that there ever was a futex at that address. This
42 There is a big conceptual problem with futex based mutexes though: it is
44 the kernel cannot help with the cleanup: if there is no 'futex queue'
45 (and in most cases there is none, futexes being fast lightweight locks)
75 because the kernel has no knowledge about how many robust futexes there
89 At the heart of this new approach there is a per-thread private list of
93 time, the kernel checks this user-space list: are there any robust futex
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/linux-6.12.1/Documentation/timers/
Dno_hz.rst12 There are three main ways of managing scheduling-clock interrupts
38 there are some situations where this old-school approach is still the
40 that use short bursts of CPU, where there are very frequent idle
43 clock interrupts will normally be delivered any way because there
68 If a CPU is idle, there is little point in sending it a scheduling-clock
84 unnecessary scheduling-clock interrupts. In these situations, there
98 There is also a boot parameter "nohz=" that can be used to disable
107 If a CPU has only one runnable task, there is little point in sending it
108 a scheduling-clock interrupt because there is no other task to switch to.
121 by one less than the number of CPUs. In these situations, there is
[all …]
/linux-6.12.1/rust/kernel/list/
Darc.rs15 /// Declares that this type has some way to ensure that there is exactly one `ListArc` instance for
22 /// there isn't a [`ListArc`]. However, we do not allow the opposite situation where a [`ListArc`]
30 /// there isn't one. This implementation is allowed by the above rule, but it means that
44 /// Informs the tracking inside this type that there is no [`ListArc`] reference anymore.
48 /// Must only be called if there is no [`ListArc`] reference, but the tracking thinks there is.
65 /// If this call returns `true`, then there is no [`ListArc`] pointing to this value.
105 // SAFETY: The caller promises that there is no `ListArc`.
111 // SAFETY: The caller promises that there is no `ListArc` reference, and also
112 // promises that the tracking thinks there is a `ListArc` reference.
139 /// There are various strategies to ensuring that a value has only one `ListArc` reference. The
[all …]
/linux-6.12.1/Documentation/livepatch/
Dlivepatch.rst15 There are many situations where users are reluctant to reboot a system. It may
26 There are multiple mechanisms in the Linux kernel that are directly related
46 a live patch is called with the help of a custom ftrace handler. But there are
53 Functions are there for a reason. They take some input parameters, acquire or
64 But there are more complex fixes. For example, a patch might change
80 switching combined with kpatch's stack trace switching. There are also
119 (Note there's not yet such an approach for kthreads.)
142 There's also a /proc/<pid>/patch_state file which can be used to
150 actually delivered (there is no data in signal pending structures). Tasks are
155 /sys/kernel/livepatch/<patch>/force attribute. Writing 1 there clears
[all …]
/linux-6.12.1/Documentation/process/
D6.Followthrough.rst13 It is a rare patch which is so good at its first posting that there is no
40 people remember who wrote kernel code, but there is little lasting fame
101 but there are times when somebody simply has to make a decision. If you
118 things. In particular, there may be more than one tree - one, perhaps,
122 For patches applying to areas for which there is no obvious subsystem tree
131 there's a good chance that you will get more comments from a new set of
151 To begin with, the visibility of your patch has increased yet again. There
153 the patch before. It may be tempting to ignore them, since there is no
162 where there are testers, there will be bug reports.
173 After any regressions have been dealt with, there may be other, ordinary
[all …]
D3.Early-stage.rst44 There are a number of very good Linux kernel developers, but they
87 - There may be elements of the proposed solution which will not be
131 the MAINTAINERS file for a relevant place to post. If there is a suitable
132 subsystem list, posting there is often preferable to posting on
138 and not all subsystems are represented there. The person listed in the
140 that role currently. So, when there is doubt about who to contact, a
158 list of people to Cc for your patches. There are a number of options
178 matter is (1) kernel developers tend to be busy, (2) there is no shortage
186 not assume that it means there is no interest in the project.
187 Unfortunately, you also cannot assume that there are no problems with your
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/linux-6.12.1/arch/mips/vdso/
Dvgettimeofday.c24 * This is behind the ifdef so that we don't provide the symbol when there's no
25 * possibility of there being a usable clocksource, because there's nothing we
60 * This is behind the ifdef so that we don't provide the symbol when there's no
61 * possibility of there being a usable clocksource, because there's nothing we
/linux-6.12.1/include/net/netfilter/
Dnf_tproxy.h47 * redirect the new connection to the proxy if there's a listener
52 * Returns the listener socket if there's one, the TIME_WAIT socket if
64 * - match: if there's a fully established connection matching the
69 * - match: if there's a listening socket matching the redirection
72 * address. The reasoning is that if there's an explicit rule, it
77 * Please note that there's an overlap between what a TPROXY target
106 * redirect the new connection to the proxy if there's a listener
111 * Returns the listener socket if there's one, the TIME_WAIT socket if
/linux-6.12.1/Documentation/networking/device_drivers/ethernet/toshiba/
Dspider_net.rst28 There are three primary states that a descriptor can be in: "empty",
46 marks it full, and advances the GDACTDPA by one. Thus, when there is
55 and advance the tail pointer. Thus, when there is flowing RX traffic,
67 then mark the descr as "empty", ready to receive data. Thus, when there
117 the hardware can fill them, there is no problem. If, for some reason,
136 and is filling the next descrs. Since the OS doesn't see this, there
157 marked xa... which is "empty". Thus, from the OS point of view, there
158 is nothing to be done. In particular, there is the implicit assumption
168 and there can be no forward progress; the OS thinks there's nothing
177 operations there. Since this will leave "holes" in the ring, there
[all …]
/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/neoverse-v1/
Dtlb.json4there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
8there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
36there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
40there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/neoverse-n1/
Dtlb.json4there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
8there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
36there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
40there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
/linux-6.12.1/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/
Dtlb.json4there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
8there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
36there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
40there are multiple misses in the TLB that are resolved by the refill, then this event only counts …
/linux-6.12.1/tools/perf/pmu-events/arch/x86/broadwellde/
Duncore-power.json16 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
25 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
34 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
43 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
52 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
61 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
70 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
79 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
88 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
97 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
[all …]
/linux-6.12.1/tools/perf/pmu-events/arch/x86/broadwellx/
Duncore-power.json16 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
25 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
34 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
43 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
52 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
61 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
70 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
79 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
88 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
97 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
[all …]
/linux-6.12.1/Documentation/filesystems/
Ddebugfs.rst14 there. The debugfs filesystem is also intended to not serve as a stable
15 ABI to user space; in theory, there are no stability constraints placed on
16 files exported there. The real world is not always so simple, though [1]_;
103 architectures, though, complicating the situation somewhat. There are
112 Similarly, there are helpers for variables of type unsigned long, in decimal
153 can be used to export binary information, but there does not appear to be
200 There is a helper function to create a device-related seq_file::
212 There are a couple of other directory-oriented helper functions::
228 There is one important thing that all debugfs users must take into account:
229 there is no automatic cleanup of any directories created in debugfs. If a
[all …]
/linux-6.12.1/Documentation/arch/powerpc/
Dpci_iov_resource_on_powernv.rst28 There is thus, in HW, a table of PE states that contains a pair of "frozen"
33 return all 1's value. MSIs are also blocked. There's a bit more state that
66 bridge being triggered. There's a PE# in the interrupt controller
75 from the CPU address space to the PCI address space. There is one M32
92 need to ensure Linux doesn't assign anything there, the M32 logic
115 address on the PowerBus). There is a way to also set the top 14
120 has 256 segments; however, there is no table for mapping a segment
124 there's a defined ordering for which window applies.
145 than one segment, we end up with more than one PE#. There is a HW
186 There are several strategies for isolating VFs in PEs:
[all …]
/linux-6.12.1/Documentation/userspace-api/media/rc/
Drc-protos.rst32 This IR protocol uses manchester encoding to encode 14 bits. There is a
77 There is a variant of rc5 called either rc5x or extended rc5
78 where there the second stop bit is the 6th command bit, but inverted.
81 done to keep it compatible with plain rc-5 where there are two start bits.
191 The sony protocol is a pulse-width encoding. There are three variants,
218 The sony protocol is a pulse-width encoding. There are three variants,
245 The sony protocol is a pulse-width encoding. There are three variants,
356 The scancode is the exact 16 bits as in the protocol. There is also a
365 as in the protocol. There is also a toggle bit.
373 as in the protocol. There is also a toggle bit.
[all …]
/linux-6.12.1/Documentation/power/
Dbasic-pm-debugging.rst49 there is the file /sys/power/pm_test that can be used to make the hibernation
50 core run in a test mode. There are 5 test modes available:
109 If the "freezer" test fails, there is a task that cannot be frozen (in that case
112 that there is a problem with the tasks freezer subsystem that should be
115 If the "devices" test fails, most likely there is a driver that cannot suspend
126 Once you have found the failing driver (there can be more than just one of
136 If the "platform" test fails, there is a problem with the handling of the
162 "reboot", "shutdown" and "platform" modes. If that does not work, there
165 individually. Otherwise, there is a problem with a modular driver and you can
168 - if there are n modules loaded and the attempt to suspend and resume fails,
[all …]
/linux-6.12.1/tools/perf/pmu-events/arch/x86/haswellx/
Duncore-power.json16 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
25 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
34 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
43 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
52 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
61 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
70 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
79 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
88 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
97 …"PublicDescription": "Number of cycles spent performing core C state transitions. There is one ev…
[all …]
/linux-6.12.1/Documentation/core-api/
Dworkqueue.rst13 There are many cases where an asynchronous process execution context
22 While there are work items on the workqueue the worker executes the
24 there is no work item left on the workqueue the worker becomes idle.
91 There are two worker-pools, one for normal work items and the other
96 BH workqueues use the same framework. However, as there can only be one
97 concurrent execution context, there's no need to worry about concurrency.
129 stalling should be optimal. As long as there are one or more runnable
132 schedules a new worker so that the CPU doesn't sit idle while there
144 regulating concurrency level is on the users. There is also a flag to
164 also used as the name of the rescuer thread if there is one.
[all …]
Dcachetlb.rst47 there will be no entries in the TLB for 'mm'.
61 running, there will be no entries in the TLB for 'mm' for
86 is, after running, there will be no entries in the TLB for
144 the caches. That is, after running, there will be no cache
153 the caches. That is, after running, there will be no cache
166 addresses from the cache. After running, there will be no
194 After running, there will be no entries in the cache for
206 After running, there will be no entries in the cache for
217 there will be no entries in the cache for the kernel address
224 There exists another whole class of cpu cache issues which currently
[all …]

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