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/Linux-v6.1/Documentation/RCU/Design/Expedited-Grace-Periods/
DExpedited-Grace-Periods.rst8 This document describes RCU's expedited grace periods.
10 high efficiency and minimal disturbance, expedited grace periods accept
20 The expedited RCU grace periods cannot be accused of being subtle,
22 has not yet provided a quiescent state for the current expedited
32 state, the expedited grace period has completed.
43 expedited grace period is shown in the following diagram:
54 Otherwise, the expedited grace period will use
72 block the current expedited grace period until it resumes and finds its
86 | Why not just have the expedited grace period check the state of all |
116 the handling of a given CPU by an RCU-sched expedited grace period is
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/Linux-v6.1/Documentation/RCU/
Dstallwarn.rst169 the expedited grace period. This parameter defines the period
170 of time that RCU will wait from the beginning of an expedited
358 If an expedited grace period detects a stall, it will place a message
361 INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 7-... } 21119 jiffies s: 73 root: 0x2/.
366 that the CPU was online at the beginning of the expedited grace period
370 indicates that the expedited grace period has been going on for 21,119
371 jiffies. The number following the "s:" indicates that the expedited
373 odd indicates that an expedited grace period is in flight. The number
376 current expedited grace period. If the tree had more than one level,
385 expedited grace periods at about the same time during the same run.
Dchecklist.rst202 The expedited forms of these primitives have the same semantics
203 as the non-expedited forms, but expediting is both expensive and
205 to real-time workloads. Use of the expedited primitives should
209 boot parameter to completely disable expedited grace periods,
212 In particular, if you find yourself invoking one of the expedited
215 a single non-expedited primitive to cover the entire batch.
217 expedited primitive, and will be much much easier on the rest
232 srcu_struct. The rules for the expedited RCU grace-period-wait
233 primitives are the same as for their non-expedited counterparts.
411 SRCU's expedited primitive (synchronize_srcu_expedited())
DRTFP.txt178 its appearance, as did expedited RCU [PaulEMcKenney2009expeditedRCU].
2256 ,Title="[{PATCH} -tip 0/3] expedited 'big hammer' {RCU} grace periods"
2264 First posting of expedited RCU to be accepted into -tip.
/Linux-v6.1/include/uapi/linux/
Dx25.h123 __u8 expedited; member
/Linux-v6.1/kernel/rcu/
DKconfig221 blocking an expedited RCU grace period is boosted immediately.
226 bool "Perform RCU expedited work in a real-time kthread"
230 Use this option to further reduce the latencies of expedited
234 disable expedited grace periods after boot by unconditionally
DKconfig.debug91 If a given expedited RCU grace period extends more than the
/Linux-v6.1/Documentation/maintainer/
Dmaintainer-entry-profile.rst66 why they should be considered on an expedited schedule. A general
/Linux-v6.1/Documentation/RCU/Design/Data-Structures/
DData-Structures.rst157 events, maintains ``rcu_barrier()`` state, tracks expedited
437 current expedited grace period. An expedited grace period has the same
438 conceptual properties as a normal grace period, but the expedited
446 expedited grace periods, respectively.
510 periods and in ``->exp_tasks`` for expedited grace periods. These last
520 RCU read-side critical section, then an expedited grace period started,
/Linux-v6.1/Documentation/RCU/Design/Requirements/
DRequirements.rst1796 | all synchronous grace periods are handled by the expedited |
1797 | grace-period mechanism. At runtime, this expedited mechanism relies |
1799 | drives the desired expedited grace period. Because dead-zone |
1801 | dead zone ends, expedited grace periods go back to using workqueues, |
1803 | user task received a POSIX signal while driving an expedited grace |
2571 SRCU also differs from other RCU flavors in that SRCU's expedited and
2572 non-expedited grace periods are implemented by the same mechanism. This
2580 period, that invocation will be automatically expedited.
2707 well as zero interprocessor interrupts undertaken during an expedited
/Linux-v6.1/Documentation/admin-guide/
Dkernel-parameters.txt4821 Measure performance of expedited synchronous
4923 Use expedited update-side primitives, if available.
4926 Use normal (non-expedited) asynchronous
4930 Use normal (non-expedited) synchronous
5076 Set timeout for expedited RCU CPU stall warning
5086 Use expedited grace-period primitives, for
5112 post-boot attempt at an expedited RCU grace
5113 period to instead use normal non-expedited