search for: mycpu

...d like to use the "-mcpu" to choose the architecture of which I want to compile the code. Does it seem right? But at the moment I cannot manage to have the CPU information in my "LLVMTargetMachine" constructor. I have it when I go through llc: clang -emit-llvm ... llc -mcpu=mycpu ... But not when I go directly from clang clang -mcpu=mycpu What should I do to have this information in the constructor using only the clang command? Best Regards, Romaric

...ct files more efficiently There's a function in lib/Driver/ToolChains/CommonArgs.cpp called tools::getCPUName that needs to be implemented for each target to determine how to process -mcpu/-march You might be able to bypass that for testing purposes by adding "-Xclang -target-cpu -Xclang mycpu" to your driver command line. ~Craig On Mon, Mar 25, 2019 at 11:24 AM Alec Ari via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote: Hi, XYZ is your actual architecture? Are you trolling? Alec _______________________________________________ LLVM D...

Hi, XYZ is your actual architecture? Are you trolling? Alec

...iles more efficiently There's a function in lib/Driver/ToolChains/CommonArgs.cpp called tools::getCPUName that needs to be implemented for each target to determine how to process -mcpu/-march You might be able to bypass that for testing purposes by adding "-Xclang -target-cpu -Xclang mycpu" to your driver command line. ~Craig On Mon, Mar 25, 2019 at 11:24 AM Alec Ari via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote: Hi, XYZ is your actual architecture? Are you trolling? Alec _______________________________________________ L...

...be added to the qnode structure + */ +#if CONFIG_NR_CPUS >= (1 << 16) +#define _cpuid_t u32 +#else +#define _cpuid_t u16 +#endif + +struct qnode; + +struct pv_qvars { + s16 cpustate; /* CPU status flag */ + _cpuid_t nxtcpu_p1; /* CPU number of next node + 1 */ + _cpuid_t mycpu; /* CPU number of this node */ + struct qnode *prev; /* Pointer to previous node */ +}; + +/** + * pv_init_vars - initialize fields in struct pv_qvars + * @pv : pointer to struct pv_qvars + * @cpu: current CPU number + */ +static __always_inline void pv_init_vars(struct pv_qvars *pv, int cpu) +{...

...Node 3 | + * +------------+------------+------------+------------+ + */ +struct pv_qnode { + struct mcs_spinlock mcs; /* MCS node */ + struct mcs_spinlock __res[3]; /* 3 reserved MCS nodes */ + s8 cpustate; /* CPU status flag */ + s8 mayhalt; /* May be halted soon */ + int mycpu; /* CPU number of this node */ + struct mcs_spinlock *head; /* Queue head node pointer */ +}; + +/** + * pv_init_node - initialize fields in struct pv_qnode + * @node: pointer to struct mcs_spinlock + * @cpu : current CPU number + */ +static inline void pv_init_node(struct mcs_spinlock *node) +{ +...

...Node 3 | + * +------------+------------+------------+------------+ + */ +struct pv_qnode { + struct mcs_spinlock mcs; /* MCS node */ + struct mcs_spinlock __res[3]; /* 3 reserved MCS nodes */ + s8 cpustate; /* CPU status flag */ + s8 mayhalt; /* May be halted soon */ + int mycpu; /* CPU number of this node */ + struct mcs_spinlock *head; /* Queue head node pointer */ +}; + +/** + * pv_init_node - initialize fields in struct pv_qnode + * @node: pointer to struct mcs_spinlock + * @cpu : current CPU number + */ +static inline void pv_init_node(struct mcs_spinlock *node) +{ +...

...de *pn = (struct pv_qnode *)node; >> + >> + BUILD_BUG_ON(sizeof(struct pv_qnode)> 5*sizeof(struct mcs_spinlock)); >> + >> + if (!pv_enabled()) >> + return; >> + >> + pn->cpustate = PV_CPU_ACTIVE; >> + pn->mayhalt = false; >> + pn->mycpu = smp_processor_id(); >> + pn->head = PV_INVALID_HEAD; >> +} > >> @@ -333,6 +393,7 @@ queue: >> node += idx; >> node->locked = 0; >> node->next = NULL; >> + pv_init_node(node); >> >> /* >> * We touched a...

...de *pn = (struct pv_qnode *)node; >> + >> + BUILD_BUG_ON(sizeof(struct pv_qnode)> 5*sizeof(struct mcs_spinlock)); >> + >> + if (!pv_enabled()) >> + return; >> + >> + pn->cpustate = PV_CPU_ACTIVE; >> + pn->mayhalt = false; >> + pn->mycpu = smp_processor_id(); >> + pn->head = PV_INVALID_HEAD; >> +} > >> @@ -333,6 +393,7 @@ queue: >> node += idx; >> node->locked = 0; >> node->next = NULL; >> + pv_init_node(node); >> >> /* >> * We touched a...

...PV Node 3 | + * +------------+------------+------------+------------+ + */ +struct pv_qnode { + struct mcs_spinlock mcs; /* MCS node */ + struct mcs_spinlock dummy[3]; /* 3 dummy MCS nodes */ + s8 cpustate; /* CPU status flag */ + s8 mayhalt; /* May be halted soon */ + u32 mycpu; /* CPU number of this node */ + struct pv_qnode *prev; /* Pointer to previous node */ +}; + +#define qhead mcs.locked /* Queue head flag */ + +/** + * pv_init_vars - initialize fields in struct pv_qnode + * @mcs: pointer to struct mcs_spinlock + * @cpu: current CPU number + */ +static inline...

On 12/03/14 18:54, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock in > the same way as was done in the PV ticket lock code. In essence, the > lock waiters will spin for a specified number of times (QSPIN_THRESHOLD > = 2^14) and then halted itself. The queue head waiter will spins > 2*QSPIN_THRESHOLD times before halting itself. When it has

On 12/03/14 18:54, Waiman Long wrote: > This patch adds para-virtualization support to the queue spinlock in > the same way as was done in the PV ticket lock code. In essence, the > lock waiters will spin for a specified number of times (QSPIN_THRESHOLD > = 2^14) and then halted itself. The queue head waiter will spins > 2*QSPIN_THRESHOLD times before halting itself. When it has

...nk a barrier is missing: Lock holder --------------------------------------- // queue_spin_unlock barrier(); ACCESS_ONCE(qlock->lock) = 0; barrier(); // pv_kick_node: if (pv->cpustate != PV_CPU_HALTED) return; ACCESS_ONCE(pv->cpustate) = PV_CPU_KICKED; __queue_kick_cpu(pv->mycpu, PV_KICK_QUEUE_HEAD); Waiter ------------------------------------------- // pv_head_spin_check ACCESS_ONCE(pv->cpustate) = PV_CPU_HALTED; lockval = cmpxchg(&qlock->lock, _QSPINLOCK_LOCKED, _QSPINLOCK_LOCKED_SLOWPATH); if (lockval == 0) { /* * Can exit now as...

...*node) > +{ > + struct pv_qnode *pn = (struct pv_qnode *)node; > + > + BUILD_BUG_ON(sizeof(struct pv_qnode) > 5*sizeof(struct mcs_spinlock)); > + > + if (!pv_enabled()) > + return; > + > + pn->cpustate = PV_CPU_ACTIVE; > + pn->mayhalt = false; > + pn->mycpu = smp_processor_id(); > + pn->head = PV_INVALID_HEAD; > +} > @@ -333,6 +393,7 @@ queue: > node += idx; > node->locked = 0; > node->next = NULL; > + pv_init_node(node); > > /* > * We touched a (possibly) cold cacheline in the per-cpu queue...

...Node 3 | + * +------------+------------+------------+------------+ + */ +struct pv_qnode { + struct mcs_spinlock mcs; /* MCS node */ + struct mcs_spinlock __res[3]; /* 3 reserved MCS nodes */ + s8 cpustate; /* CPU status flag */ + s8 mayhalt; /* May be halted soon */ + int mycpu; /* CPU number of this node */ + struct mcs_spinlock *head; /* Queue head node pointer */ +}; + +/** + * pv_init_node - initialize fields in struct pv_qnode + * @node: pointer to struct mcs_spinlock + * @cpu : current CPU number + */ +static inline void pv_init_node(struct mcs_spinlock *node) +{ +...

...Node 3 | + * +------------+------------+------------+------------+ + */ +struct pv_qnode { + struct mcs_spinlock mcs; /* MCS node */ + struct mcs_spinlock __res[3]; /* 3 reserved MCS nodes */ + s8 cpustate; /* CPU status flag */ + s8 mayhalt; /* May be halted soon */ + int mycpu; /* CPU number of this node */ + struct mcs_spinlock *head; /* Queue head node pointer */ +}; + +/** + * pv_init_node - initialize fields in struct pv_qnode + * @node: pointer to struct mcs_spinlock + * @cpu : current CPU number + */ +static inline void pv_init_node(struct mcs_spinlock *node) +{ +...

...queue_spin_unlock_slowpath(lock); } else { __queue_spin_unlock(lock); } > // pv_kick_node: > if (pv->cpustate != PV_CPU_HALTED) > return; > ACCESS_ONCE(pv->cpustate) = PV_CPU_KICKED; > __queue_kick_cpu(pv->mycpu, PV_KICK_QUEUE_HEAD); > > Waiter ------------------------------------------- > > // pv_head_spin_check > ACCESS_ONCE(pv->cpustate) = PV_CPU_HALTED; > lockval = cmpxchg(&qlock->lock, > _QSPINLOCK_LOCKED, >...

...queue_spin_unlock_slowpath(lock); } else { __queue_spin_unlock(lock); } > // pv_kick_node: > if (pv->cpustate != PV_CPU_HALTED) > return; > ACCESS_ONCE(pv->cpustate) = PV_CPU_KICKED; > __queue_kick_cpu(pv->mycpu, PV_KICK_QUEUE_HEAD); > > Waiter ------------------------------------------- > > // pv_head_spin_check > ACCESS_ONCE(pv->cpustate) = PV_CPU_HALTED; > lockval = cmpxchg(&qlock->lock, > _QSPINLOCK_LOCKED, >...

...+79,6 @@ static inline void pv_init_node(struct mcs_spinlock *node) BUILD_BUG_ON(sizeof(struct pv_qnode) > 5*sizeof(struct mcs_spinlock)); - if (!pv_enabled()) - return; - pn->cpustate = PV_CPU_ACTIVE; pn->mayhalt = false; pn->mycpu = smp_processor_id(); @@ -132,9 +129,6 @@ static inline bool pv_link_and_wait_node(u32 old, struct mcs struct pv_qnode *ppn, *pn = (struct pv_qnode *)node; unsigned int count; - if (!pv_enabled()) - return false; - if (!(old & _Q_TAIL_MASK)) {...

...+79,6 @@ static inline void pv_init_node(struct mcs_spinlock *node) BUILD_BUG_ON(sizeof(struct pv_qnode) > 5*sizeof(struct mcs_spinlock)); - if (!pv_enabled()) - return; - pn->cpustate = PV_CPU_ACTIVE; pn->mayhalt = false; pn->mycpu = smp_processor_id(); @@ -132,9 +129,6 @@ static inline bool pv_link_and_wait_node(u32 old, struct mcs struct pv_qnode *ppn, *pn = (struct pv_qnode *)node; unsigned int count; - if (!pv_enabled()) - return false; - if (!(old & _Q_TAIL_MASK)) {...