Re: [tip:perf/core] perf tools: Protect accesses the dso rbtrees/ lists with a rw lock

[Ingo Molnar <mingo@kernel.org>]

* Arnaldo Carvalho de Melo <acme@redhat.com> wrote:

> Em Tue, Jun 09, 2015 at 11:56:10AM +0200, Ingo Molnar escreveu:
> > * tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com> wrote:
>  
> > > +void dsos__add(struct dsos *dsos, struct dso *dso)
> > > +{
> > > +	pthread_rwlock_wrlock(&dsos->lock);
> > > +	__dsos__add(dsos, dso);
> > > +	pthread_rwlock_unlock(&dsos->lock);
> > >  }
> > 
> > Please introduce wrappers and use the kernel API names: 
> > read_lock()/read_unlock()/etc. (and name the mutex primitives 
> > mutex_lock()/unlock())
> > 
> > That way kernel developers will find their way around the perf locking details 
> > easily, and we can also use liblockdep to check locking correctness.
> 
> Yeah, we discussed about that, will do it eventually, you said this was already 
> present in some tools/ code, but I couldn't find it:
> 
> [acme@zoo linux]$ find tools/ -type f | xargs grep '\<mutex_unlock'
> [acme@zoo linux]$ 

it's in -tip in tools/kvm/:

 triton:~/tip> git grep mutex_lock tools/kvm/include/kvm/mutex.h 
 tools/kvm/include/kvm/mutex.h:static inline void mutex_lock(struct mutex *lock)

 triton:~/tip> git grep down tools/kvm/include/kvm/rwsem.h 
 tools/kvm/include/kvm/rwsem.h:static inline void down_read(pthread_rwlock_t *rwsem)
 tools/kvm/include/kvm/rwsem.h:static inline void down_write(pthread_rwlock_t *rwsem)

Thanks,

	Ingo