linux-kernel - Re: [PATCH v1 3/6] rcu: rename rcu_invoke_kfree_callback/rcu_kfree

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Date:   Mon, 16 Mar 2020 11:47:26 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        RCU <rcu@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH v1 3/6] rcu: rename
 rcu_invoke_kfree_callback/rcu_kfree_callback

On Sun, Mar 15, 2020 at 07:18:37PM +0100, Uladzislau Rezki (Sony) wrote:
> Rename rcu_invoke_kfree_callback to rcu_invoke_kvfree_callback.
> Do the same with second trace event, that is rcu_kfree_callback,
> it becomes rcu_kvfree_callback. The reason is to be aligned with
> kvfree notation.

Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>

thanks,

 - Joel
> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  include/trace/events/rcu.h | 8 ++++----
>  kernel/rcu/tiny.c          | 2 +-
>  kernel/rcu/tree.c          | 4 ++--
>  3 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
> index f9a7811148e2..0ee93d0b1daa 100644
> --- a/include/trace/events/rcu.h
> +++ b/include/trace/events/rcu.h
> @@ -506,13 +506,13 @@ TRACE_EVENT_RCU(rcu_callback,
>  
>  /*
>   * Tracepoint for the registration of a single RCU callback of the special
> - * kfree() form.  The first argument is the RCU type, the second argument
> + * kvfree() form.  The first argument is the RCU type, the second argument
>   * is a pointer to the RCU callback, the third argument is the offset
>   * of the callback within the enclosing RCU-protected data structure,
>   * the fourth argument is the number of lazy callbacks queued, and the
>   * fifth argument is the total number of callbacks queued.
>   */
> -TRACE_EVENT_RCU(rcu_kfree_callback,
> +TRACE_EVENT_RCU(rcu_kvfree_callback,
>  
>  	TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
>  		 long qlen),
> @@ -596,12 +596,12 @@ TRACE_EVENT_RCU(rcu_invoke_callback,
>  
>  /*
>   * Tracepoint for the invocation of a single RCU callback of the special
> - * kfree() form.  The first argument is the RCU flavor, the second
> + * kvfree() form.  The first argument is the RCU flavor, the second
>   * argument is a pointer to the RCU callback, and the third argument
>   * is the offset of the callback within the enclosing RCU-protected
>   * data structure.
>   */
> -TRACE_EVENT_RCU(rcu_invoke_kfree_callback,
> +TRACE_EVENT_RCU(rcu_invoke_kvfree_callback,
>  
>  	TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
>  
> diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
> index 4b99f7b88bee..3dd8e6e207b0 100644
> --- a/kernel/rcu/tiny.c
> +++ b/kernel/rcu/tiny.c
> @@ -86,7 +86,7 @@ static inline bool rcu_reclaim_tiny(struct rcu_head *head)
>  
>  	rcu_lock_acquire(&rcu_callback_map);
>  	if (__is_kfree_rcu_offset(offset)) {
> -		trace_rcu_invoke_kfree_callback("", head, offset);
> +		trace_rcu_invoke_kvfree_callback("", head, offset);
>  		kvfree((void *)head - offset);
>  		rcu_lock_release(&rcu_callback_map);
>  		return true;
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 1c0a73616872..eef75cd210fd 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -2720,7 +2720,7 @@ __call_rcu(struct rcu_head *head, rcu_callback_t func)
>  	// If no-CBs CPU gets here, rcu_nocb_try_bypass() acquired ->nocb_lock.
>  	rcu_segcblist_enqueue(&rdp->cblist, head);
>  	if (__is_kfree_rcu_offset((unsigned long)func))
> -		trace_rcu_kfree_callback(rcu_state.name, head,
> +		trace_rcu_kvfree_callback(rcu_state.name, head,
>  					 (unsigned long)func,
>  					 rcu_segcblist_n_cbs(&rdp->cblist));
>  	else
> @@ -2909,7 +2909,7 @@ static void kfree_rcu_work(struct work_struct *work)
>  		next = head->next;
>  		debug_rcu_head_unqueue(head);
>  		rcu_lock_acquire(&rcu_callback_map);
> -		trace_rcu_invoke_kfree_callback(rcu_state.name, head, offset);
> +		trace_rcu_invoke_kvfree_callback(rcu_state.name, head, offset);
>  
>  		if (!WARN_ON_ONCE(!__is_kfree_rcu_offset(offset)))
>  			kvfree((void *)head - offset);
> -- 
> 2.20.1
>