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Prevent one CPU from getting chosen by concurrent forks

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One CPU could be chosen by concurrent forks because CPU selection and
runq addition are not done atomicly. So this fix makes the two steps
atomic.

Change-Id: Ib6b75ad655789385d13207e0a47fa4717dec854a
This commit is contained in:
Masamichi Takagi
2018-09-04 09:33:10 +09:00
parent 82914c6a2e
commit 0b0b7b03d7
4 changed files with 26 additions and 10 deletions
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kernel/include/process.h
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@@ -275,6 +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 */
struct process_hash {
struct list_head list[HASH_SIZE];