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zephyr/kernel
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Yong Cong Sin d26c712258 arch: add new interfaces to set/get the current thread of current CPU 
Add the following arch-specific APIs:
- arch_curr_thread()
- arch_set_curr_thread()

which allow SMP architectures to implement a faster "get current
thread pointer" than the default provided by the kernel. The 'set'
function is required for the 'get' to work, more on that later.

When `CONFIG_ARCH_HAS_CUSTOM_CURRENT_IMPL` is selected, calls to
`_current` & `k_sched_current_thread_query()` will be redirected to
`arch_curr_thread()`, which ideally should translate into a single
instruction read, avoiding the current
"lock > read CPU > read current thread > unlock" path in SMP
architectures and thus greatly improves the read performance.

However, since the kernel relies on a copy of the "current thread"s on
every CPU for certain operations (i.e. to compare the priority of the
currently scheduled thread on another CPU to determine if IPI should be
sent), we can't eliminate the copy of "current thread" (`current`) from
the `struct _cpu` and therefore the kernel now has to invoke
`arch_set_curr_thread()` in addition to what it has been doing. This
means that it will take slightly longer (most likely one instruction
write) to change the current thread pointer on the current
CPU.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
2024-11-23 20:12:24 -05:00
..
include arch: add new interfaces to set/get the current thread of current CPU 2024-11-23 20:12:24 -05:00
paging kernel: mm: rename z_num_pagefaults_get to k_mem_num_* 2024-06-12 21:13:26 -04:00
atomic_c.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
banner.c kernel: banner: Add option to clear screen on boot 2024-06-13 20:30:14 -04:00
busy_wait.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
CMakeLists.txt lib c/cpp: Move .ctor .init_array handling from C++ to kernel 2024-06-25 19:14:37 -04:00
compiler_stack_protect.c arch: kernel: lib: toolchain: Standardize TLS keyword 2024-09-23 10:01:48 +02:00
condvar.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
cpu_mask.c kernel: Simplify k_thread_cpu_pin() 2024-09-20 09:02:38 +02:00
device.c device_dt_metadata: handle dt_meta being NULL 2024-08-12 15:54:22 +02:00
dynamic.c kernel: fix typo 2024-07-08 15:51:37 +02:00
dynamic_disabled.c kernel: dynamic: declare dynamic stubs when disabled 2023-07-24 12:59:43 -04:00
errno.c arch: kernel: lib: toolchain: Standardize TLS keyword 2024-09-23 10:01:48 +02:00
events.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
fatal.c kernel: fatal: Fix NO_OPTIMIZATIONS build 2024-08-07 19:03:40 -04:00
float.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
futex.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
idle.c pm: Move z_pm_save_idle_exit to pm subsys 2024-05-27 02:10:03 -07:00
init.c zephyr: bulk update to DT_NODE_HAS_STATUS_OKAY 2024-10-03 17:06:52 +01:00
init_static.c lib c/cpp: Move .ctor .init_array handling from C++ to kernel 2024-06-25 19:14:37 -04:00
ipi.c kernel: Add CONFIG_ARCH_HAS_DIRECTED_IPIS 2024-06-04 22:35:54 -04:00
irq_offload.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
Kconfig Revert "kernel: banner: Expose tainted builds" 2024-10-29 14:17:21 -05:00
Kconfig.device libc: common: Fix init hang issue 2024-06-26 13:07:02 -04:00
Kconfig.init init: support per-core init hook 2024-11-16 14:04:25 -05:00
Kconfig.mem_domain kconfig: replace known integer constants with variables 2024-07-27 20:49:15 +03:00
Kconfig.obj_core kernel: reorg Kconfigs and split them 2024-03-06 19:27:28 -05:00
Kconfig.smp kernel: remove CONFIG_MP_NUM_CPUS 2024-09-19 18:28:37 +01:00
Kconfig.vm kernel: mmu: support for on-demand mappings 2024-08-26 17:25:41 -04:00
kheap.c tracing: add k_realloc trace 2024-05-28 17:55:12 +02:00
mailbox.c kernel: Clean up mailbox async msg configuration 2024-04-09 11:05:55 +02:00
main_weak.c kernel: Switch main return type from void to int 2023-04-14 07:49:41 +09:00
mem_domain.c coding guidelines: comply with MISRA Rule 12.1. 2024-05-12 13:37:27 -04:00
mem_slab.c kernel: mem_slab: always validate memory address on free 2024-11-16 15:54:56 -05:00
mempool.c kernel: avoided increments/decrements with side effects 2024-06-14 19:19:29 +02:00
mmu.c arch: add new interfaces to set/get the current thread of current CPU 2024-11-23 20:12:24 -05:00
msg_q.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
mutex.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
nothread.c kernel: fix k_sleep in no multi-threading mode 2024-11-16 14:07:41 -05:00
obj_core.c kernel: reduce k_spin_unlock calls using if-else if-else structure 2024-07-27 20:48:07 +03:00
pipes.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
poll.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
priority_queues.c kernel: priority queues: declare as static inlines 2024-04-22 16:40:11 -04:00
queue.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
sched.c arch: add new interfaces to set/get the current thread of current CPU 2024-11-23 20:12:24 -05:00
sem.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
smp.c kernel: Relax loop in z_smp_global_lock() 2024-05-22 21:35:06 -04:00
spinlock_validate.c kernel/spinlock: Fix SPIN_VALIDATE in ISRs 2024-05-02 13:55:03 -04:00
stack.c kernel: Apply 'unlikely' attribute 2024-10-15 04:06:32 -04:00
system_work_q.c kernel: system_work_q: Mark queue thread as essential 2024-04-25 21:40:24 +02:00
thread.c arch: add new interfaces to set/get the current thread of current CPU 2024-11-23 20:12:24 -05:00
thread_monitor.c style: kernel: comply with MISRA C:2012 Rule 15.6 2024-09-11 07:40:35 -04:00
timeout.c kernel: fix typo 2024-07-08 15:51:37 +02:00
timer.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
timeslicing.c kernel: Add CONFIG_IPI_OPTIMIZE 2024-06-04 22:35:54 -04:00
usage.c kernel: Remove duplicate execution_cycles write and improve docstring 2024-04-28 13:04:20 -04:00
userspace.c sys: util: use BITS_PER_BYTE macro instead of the magic number 8 2024-11-16 15:22:35 -05:00
userspace_handler.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
version.c build: namespace the generated headers with zephyr/ 2024-05-28 22:03:55 +02:00
work.c kernel: workq: Fix function format to avoid CI Warning 2024-11-20 10:15:20 +00:00
xip.c arch: common: fix copy for ramfunc region during XIP init 2024-11-06 10:19:08 -08:00