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zephyr/kernel
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Andy Ross fd340ebf31 sched: Optimize dummy thread usage on SMP 
Nicolas Pitre points out that since these thread structs are just
dummies for the context swtiching, they can be presumed to be "write
only" and thus there's no point in having one per CPU, everyone can
share the same one.

The only gotcha is that we never really documented (nor really have a
place to document) that rule, so it's not theoretically impossible for
an architecture to read back what it might have written underneath
arch_switch().  Leave this in a separate commit for bisection
purposes, but the risk seems very low.

Signed-off-by: Andy Ross <andyross@google.com>
2024-05-02 13:55:03 -04:00
..
include sched: Optimize dummy thread usage on SMP 2024-05-02 13:55:03 -04:00
paging kernel: mm: only include demand_paging.h if needed 2023-11-23 10:01:45 +01:00
atomic_c.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
banner.c kernel: banner: use BUILD_VERSION only if not empty 2024-04-04 23:47:33 +02:00
busy_wait.c kernel: Use k_us_to_cyc_ceil32 in k_busy_wait 2023-12-05 09:24:28 +01:00
CMakeLists.txt kernel: move nothread support to own file 2024-04-06 14:22:08 +03:00
compiler_stack_protect.c kernel: canaries: Allow using TLS to store it 2023-08-08 19:08:04 -04:00
condvar.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
cpu_mask.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
device.c syscall: rename Z_OOPS -> K_OOPS 2023-11-03 11:46:52 +01:00
dynamic.c kernel: align kernel stack size declaration 2024-03-27 19:27:10 -04:00
dynamic_disabled.c kernel: dynamic: declare dynamic stubs when disabled 2023-07-24 12:59:43 -04:00
errno.c kernel: move syscall_handler.h to internal include directory 2023-11-03 11:46:52 +01:00
events.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
fatal.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
float.c kernel: move float operations out of thread.c 2024-03-06 19:27:28 -05:00
futex.c syscall: rename Z_SYSCALL_ to K_SYSCALL_ 2023-11-03 11:46:52 +01:00
idle.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
init.c sched: Optimize dummy thread usage on SMP 2024-05-02 13:55:03 -04:00
ipi.c kernel: rename sliceable -> thread_is_sliceable 2024-04-01 18:47:36 -04:00
irq_offload.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
Kconfig kernel: increase main stack size for ztest on ARC 2024-04-24 10:49:05 +02:00
Kconfig.device kernel: reorg Kconfigs and split them 2024-03-06 19:27:28 -05:00
Kconfig.obj_core kernel: reorg Kconfigs and split them 2024-03-06 19:27:28 -05:00
Kconfig.smp kernel: reorg Kconfigs and split them 2024-03-06 19:27:28 -05:00
Kconfig.vm mm: introduce CONFIG_KERNEL_VM_USE_CUSTOM_MEM_RANGE_CHECK 2023-10-20 15:08:34 +02:00
kheap.c kernel: rename h -> heap 2024-03-06 19:27:28 -05:00
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 kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
mem_slab.c coding guidelines: comply with MISRA Rule 2.2 2024-05-02 09:32:46 +01:00
mempool.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
mmu.c kernel: mm: introduce k_mem_phys_map()/_unmap() 2024-04-10 07:44:27 -04:00
msg_q.c coding guidelines: comply with MISRA Rule 21.15 2024-05-01 10:52:43 -04:00
mutex.c kernel: move thread related helper function kthread.h 2024-04-01 18:47:36 -04:00
nothread.c kernel: move nothread support to own file 2024-04-06 14:22:08 +03:00
obj_core.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
pipes.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
poll.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
priority_queues.c kernel: priority queues: declare as static inlines 2024-04-22 16:40:11 -04:00
queue.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
sched.c sched: Optimize dummy thread usage on SMP 2024-05-02 13:55:03 -04:00
sem.c coding guidelines: comply with MISRA Rule 2.2 2024-05-02 09:32:46 +01:00
smp.c sched: Optimize dummy thread usage on SMP 2024-05-02 13:55:03 -04:00
spinlock_validate.c kernel/spinlock: Fix SPIN_VALIDATE in ISRs 2024-05-02 13:55:03 -04:00
stack.c kernel: stack: Check possible overflow 2024-04-22 15:20:39 -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 coding guidelines: comply with MISRA Rule 20.9 2024-05-01 19:48:19 +01:00
thread_monitor.c kernel: split thread monitor 2024-03-06 19:27:28 -05:00
timeout.c kernel: timeout: Optimize setting next alarm 2024-04-09 13:55:07 -04:00
timer.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
timeslicing.c kernel: timeslicing: add time slice reset in slice per thread api 2024-05-01 22:55:50 +01:00
usage.c kernel: Remove duplicate execution_cycles write and improve docstring 2024-04-28 13:04:20 -04:00
userspace.c coding guidelines: comply with MISRA C:2012 Rule 11.2 2024-05-01 10:53:20 -04:00
userspace_handler.c kernel: add closing comments to config endifs 2024-03-25 18:03:31 -04:00
version.c
work.c coding guidelines: comply with MISRA Rule 2.2 2024-05-02 09:32:46 +01:00
xip.c kernel: canaries: Allow using TLS to store it 2023-08-08 19:08:04 -04:00