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uti: Workaround not to share CPU with OpenMP threads

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* Assign uti thread to the last idle CPU so that it's not shared with
  an OpenMP thread

Change-Id: Ia42cae056ce81fde9b6dab6286b39a52f3c9e172
This commit is contained in:
Masamichi Takagi
2018-09-03 18:08:03 +09:00
parent dbba7dea18
commit 5cb8a1f10f
8 changed files with 34 additions and 14 deletions
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3
kernel/include/process.h
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@@ -275,7 +275,7 @@ extern struct list_head resource_set_list;
extern mcs_rwlock_lock_t resource_set_lock;
extern int idle_halt;
extern int allow_oversubscribe;
extern ihk_spinlock_t runq_reservation_lock; /* To serialize runq reservations for competeing fork()s */
extern ihk_spinlock_t runq_reservation_lock; /* mutex for cpuid reservation (clv->runq_reserved) */
struct process_hash {
struct list_head list[HASH_SIZE];
@@ -557,6 +557,7 @@ struct process {
unsigned long heap_extension;
unsigned long mpol_bind_mask;
int uti_thread_rank; /* Spawn on Linux CPU when clone_count reaches this */
int uti_use_last_cpu; /* Work-around not to share CPU with OpenMP thread */
int clone_count;
// perf_event

3
kernel/include/syscall.h
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@@ -201,6 +201,7 @@ struct program_load_desc {
long stack_premap;
unsigned long mpol_bind_mask;
int uti_thread_rank; /* N-th clone() spawns a thread on Linux CPU */
int uti_use_last_cpu; /* Work-around not to share CPU with OpenMP thread */
int nr_processes;
int process_rank;
char shell_path[SHELL_PATH_MAX_LEN];
@@ -350,7 +351,7 @@ struct syscall_post {
#define SYSCALL_FOOTER return do_syscall(&request, ihk_mc_get_processor_id(), 0)
extern long do_syscall(struct syscall_request *req, int cpu, int pid);
int obtain_clone_cpuid(cpu_set_t *cpu_set);
int obtain_clone_cpuid(cpu_set_t *cpu_set, int use_last);
extern long syscall_generic_forwarding(int n, ihk_mc_user_context_t *ctx);
#define DECLARATOR(number,name) __NR_##name = number,