diff options
| author | Ian Moffett <ian@osmora.org> | 2025-06-27 21:13:17 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-06-27 21:13:17 -0400 |
| commit | b2f7f9858f5516a029e1c5dfe2140538ed36c9de (patch) | |
| tree | fa6c8f03326551cb393bce9b7d811e4c18063239 /sys | |
| parent | 5e4cf6049be6cf8bd8033295973c5aa8282995b8 (diff) | |
kernel/amd64: mp: Give each core an idle threadexpt
Having the same amount of idle threads per core allow the CPU to always
have a thread assigned to one of its cores even when there are currently
no other threads for it to take.
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/amd64/amd64/mp.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/arch/amd64/amd64/mp.c b/sys/arch/amd64/amd64/mp.c index 1e6d8d9..dbee32c 100644 --- a/sys/arch/amd64/amd64/mp.c +++ b/sys/arch/amd64/amd64/mp.c @@ -31,6 +31,7 @@ #include <sys/limine.h> #include <sys/limits.h> #include <sys/syslog.h> +#include <sys/proc.h> #include <sys/spinlock.h> #include <sys/sched.h> #include <sys/atomic.h> @@ -41,6 +42,7 @@ #define pr_trace(fmt, ...) kprintf("cpu_mp: " fmt, ##__VA_ARGS__) +extern struct proc g_proc0; static volatile struct limine_smp_request g_smp_req = { .id = LIMINE_SMP_REQUEST, .revision = 0 @@ -91,12 +93,14 @@ mp_bootstrap_aps(struct cpu_info *ci) struct limine_smp_response *resp = g_smp_req.response; struct limine_smp_info **cpus; size_t cpu_init_counter; + uint32_t ncpu; /* Should not happen */ __assert(resp != NULL); cpus = resp->cpus; - cpu_init_counter = resp->cpu_count - 1; + ncpu = resp->cpu_count; + cpu_init_counter = ncpu - 1; ci_list[0] = ci; if (resp->cpu_count == 1) { @@ -114,6 +118,12 @@ mp_bootstrap_aps(struct cpu_info *ci) cpus[i]->goto_address = ap_trampoline; } + /* Start up idle threads */ + pr_trace("kicking %d idle threads...\n", ncpu); + for (uint32_t i = 0; i < ncpu; ++i) { + spawn(&g_proc0, sched_enter, NULL, 0, NULL); + } + /* Wait for all cores to be ready */ while ((ncpu_up - 1) < cpu_init_counter); } |