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

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Date:	Wed, 10 Jun 2015 09:04:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	namhyung@...nel.org, adrian.hunter@...el.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	dsahern@...il.com, jolsa@...hat.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf tools: Protect accesses the dso rbtrees/
 lists with a rw lock


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

> Em Tue, Jun 09, 2015 at 11:56:10AM +0200, Ingo Molnar escreveu:
> > * tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.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
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