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uti: futex: McKernel waker sends IPI to Linux waiter CPU

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Change-Id: I6f725b3a6b1b26b9f553d8c58132c0c0a4416683
This commit is contained in:
Masamichi Takagi
2021-02-05 09:39:07 +09:00
parent adc5b7102f
commit e3927a0b95
5 changed files with 23 additions and 5 deletions
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19
kernel/futex.c
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@@ -73,12 +73,15 @@
#include <ihk/debug.h>
#include <syscall.h>
#include <kmalloc.h>
#include <ikc/queue.h>
unsigned long ihk_mc_get_ns_per_tsc(void);
struct futex_hash_bucket *futex_queues;
extern struct ihk_ikc_channel_desc **ikc2linuxs;
struct futex_hash_bucket *get_futex_queues(void)
{
return futex_queues;
@@ -238,11 +241,19 @@ static void wake_futex(struct futex_q *q)
if (q->uti_futex_resp) {
int rc;
dkprintf("%s: waking up migrated-to-Linux thread (tid %d),uti_futex_resp=%p\n",
__func__, p->tid, q->uti_futex_resp);
struct ikc_scd_packet pckt;
struct ihk_ikc_channel_desc *resp_channel = cpu_local_var(ikc2linux);
struct ihk_ikc_channel_desc *resp_channel;
dkprintf("%s: waking up migrated-to-Linux thread (tid %d),uti_futex_resp=%p,linux_cpu: %d\n",
__func__, p->tid, q->uti_futex_resp, q->linux_cpu);
/* does this Linux CPU have a connected channel? */
if (ikc2linuxs[q->linux_cpu]) {
resp_channel = ikc2linuxs[q->linux_cpu];
} else {
resp_channel = cpu_local_var(ikc2linux);
}
pckt.msg = SCD_MSG_FUTEX_WAKE;
pckt.futex.resp = q->uti_futex_resp;
pckt.futex.spin_sleep = &p->spin_sleep;