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do_syscall(): eliminate centralized lock for exit/kill code path (use IKC2 thread pool)

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This commit is contained in:
Balazs Gerofi
2017-01-08 11:56:23 +09:00
parent 0e67e9266b
commit cdffc5e853
2 changed files with 0 additions and 16 deletions
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13
kernel/syscall.c
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@@ -267,16 +267,12 @@ static void send_syscall(struct syscall_request *req, int cpu, int pid, struct s
#endif
}
ihk_spinlock_t syscall_lock;
long do_syscall(struct syscall_request *req, int cpu, int pid)
{
struct syscall_response res;
struct syscall_request req2 IHK_DMA_ALIGN;
int error;
long rc;
int islock = 0;
unsigned long irqstate;
struct thread *thread = cpu_local_var(current);
struct process *proc = thread->proc;
#ifdef TRACK_SYSCALLS
@@ -288,7 +284,6 @@ long do_syscall(struct syscall_request *req, int cpu, int pid)
ihk_mc_get_processor_id(),
req->number);
irqstate = 0; /* for avoidance of warning */
barrier();
if(req->number != __NR_exit_group){
@@ -299,11 +294,6 @@ long do_syscall(struct syscall_request *req, int cpu, int pid)
++thread->in_syscall_offload;
}
if(req->number == __NR_exit_group ||
req->number == __NR_kill){ // interrupt syscall
islock = 1;
irqstate = ihk_mc_spinlock_lock(&syscall_lock);
}
/* The current thread is the requester and any thread from
* the pool may serve the request */
req->rtid = cpu_local_var(current)->tid;
@@ -394,9 +384,6 @@ long do_syscall(struct syscall_request *req, int cpu, int pid)
__FUNCTION__, req->number, res.ret);
rc = res.ret;
if(islock){
ihk_mc_spinlock_unlock(&syscall_lock, irqstate);
}
if(req->number != __NR_exit_group){
--thread->in_syscall_offload;