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Code Releases Activity

RCU Unwinder can now retry without yielding

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This commit is contained in:
Maria Matejka 2024-06-06 13:32:31 +02:00
parent 4104d668d9
commit 7c59ef3faa
1 changed files with 11 additions and 5 deletions
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8
lib/locking.h
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@ -494,7 +494,8 @@ static inline void locking_unwind(struct lock_order *desired)
struct rcu_unwinder {
struct lock_order locking_stack;
u64 retry;
u32 retry;
u8 fast;
jmp_buf buf;
};
@ -511,15 +512,20 @@ static inline void _rcu_unwinder_unlock_(struct rcu_unwinder *o UNUSED)
if (setjmp(_i->buf)) { \
rcu_read_unlock(); \
locking_unwind(&_i->locking_stack); \
if (_i->fast) _i->fast = 0; \
else { \
birdloop_yield(); \
if (!(++_i->retry % RCU_UNWIND_WARN)) \
log(L_WARN "Suspiciously many RCU_ANCHORs retried (%lu)" \
" at %s:%d", _i->retry, __FILE__, __LINE__); \
} \
} \
_i->locking_stack = locking_stack; \
rcu_read_lock(); \
#define RCU_RETRY(_i) do { if (_i) longjmp(_i->buf, 1); else bug("No rcu retry allowed here"); } while (0)
#define RCU_RETRY_FAST(_i) do { (_i)->fast++; RCU_RETRY(_i); } while (0)
#define RCU_WONT_RETRY ((struct rcu_unwinder *) NULL)
#endif