linux-kernel - Re: [PATCH 2/6] rcu: Create rcu

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Message-ID: <20131017103604.GJ19729@linux.vnet.ibm.com>
Date:	Thu, 17 Oct 2013 16:06:04 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] rcu: Create rcu_sync infrastructure

* Peter Zijlstra <peterz@...radead.org> [2013-10-08 12:25:07]:

> From: Oleg Nesterov <oleg@...hat.com>
> 
> It is functionally equivalent to
> 
>         struct rcu_sync_struct {
>                 atomic_t counter;
>         };
> 
>         static inline bool rcu_sync_is_idle(struct rcu_sync_struct *xxx)
>         {
>                 return atomic_read(&xxx->counter) == 0;
>         }
> 
>         static inline void rcu_sync_enter(struct rcu_sync_struct *xxx)
>         {
>                 atomic_inc(&xxx->counter);
>                 synchronize_sched();
>         }
> 
>         static inline void rcu_sync_enter(struct rcu_sync_struct *xxx)

Guess you meant rcu_sync_exit

>         {
>                 synchronize_sched();
>                 atomic_dec(&xxx->counter);
>         }
> 
> except: it records the state and synchronize_sched() is only called by
> rcu_sync_enter() and only if necessary.
> 

-- 
Thanks and Regards
Srikar Dronamraju

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