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From: Steven Rostedt <rostedt@goodmis.org>
To: Dmitry Ilvokhin <d@ilvokhin.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>,
	Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Pavel Machek <pavel@kernel.org>, Len Brown <lenb@kernel.org>,
	Brendan Jackman <jackmanb@google.com>,
	Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
	Oscar Salvador <osalvador@suse.de>,
	Qi Zheng <zhengqi.arch@bytedance.com>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-trace-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	"linux-cxl@vger.kernel.orgkernel-team"@meta.com
Subject: Re: [PATCH v4 5/5] mm: add tracepoints for zone lock
Date: Fri, 27 Feb 2026 14:46:49 -0500	[thread overview]
Message-ID: <20260227144649.3dbff742@gandalf.local.home> (raw)
In-Reply-To: <ae145fe890f028409f727b4921904b547346fa0b.1772206930.git.d@ilvokhin.com>

On Fri, 27 Feb 2026 16:00:27 +0000
Dmitry Ilvokhin <d@ilvokhin.com> wrote:

>  static inline void zone_lock_init(struct zone *zone)
>  {
> @@ -12,26 +59,41 @@ static inline void zone_lock_init(struct zone *zone)
>  
>  #define zone_lock_irqsave(zone, flags)				\
>  do {								\
> +	bool success = true;					\
> +								\
> +	__zone_lock_trace_start_locking(zone);			\
>  	spin_lock_irqsave(&(zone)->_lock, flags);		\
> +	__zone_lock_trace_acquire_returned(zone, success);	\

Why the "success" variable and not just:

	__zone_lock_trace_acquire_returned(zone, true);

 ?


>  } while (0)
>  
>  #define zone_trylock_irqsave(zone, flags)			\
>  ({								\
> -	spin_trylock_irqsave(&(zone)->_lock, flags);		\
> +	bool success;						\
> +								\
> +	__zone_lock_trace_start_locking(zone);			\
> +	success = spin_trylock_irqsave(&(zone)->_lock, flags);	\
> +	__zone_lock_trace_acquire_returned(zone, success);	\
> +	success;						\
>  })
>  
>  static inline void zone_unlock_irqrestore(struct zone *zone, unsigned long flags)
>  {
> +	__zone_lock_trace_released(zone);
>  	spin_unlock_irqrestore(&zone->_lock, flags);
>  }
>  
>  static inline void zone_lock_irq(struct zone *zone)
>  {
> +	bool success = true;
> +
> +	__zone_lock_trace_start_locking(zone);
>  	spin_lock_irq(&zone->_lock);
> +	__zone_lock_trace_acquire_returned(zone, success);

Same here.

>  }
>  
>  static inline void zone_unlock_irq(struct zone *zone)
>  {
> +	__zone_lock_trace_released(zone);
>  	spin_unlock_irq(&zone->_lock);
>  }
>

-- Steve



      reply	other threads:[~2026-02-27 19:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-27 16:00 [PATCH v4 0/5] mm: zone lock tracepoint instrumentation Dmitry Ilvokhin
2026-02-27 16:00 ` [PATCH v4 1/5] mm: introduce zone lock wrappers Dmitry Ilvokhin
2026-02-27 20:36   ` David Hildenbrand (Arm)
2026-02-27 16:00 ` [PATCH v4 2/5] mm: convert zone lock users to wrappers Dmitry Ilvokhin
2026-02-27 20:39   ` David Hildenbrand (Arm)
2026-02-27 16:00 ` [PATCH v4 3/5] mm: convert compaction to zone lock wrappers Dmitry Ilvokhin
2026-02-27 20:39   ` David Hildenbrand (Arm)
2026-02-27 16:00 ` [PATCH v4 4/5] mm: rename zone->lock to zone->_lock Dmitry Ilvokhin
2026-02-27 20:40   ` David Hildenbrand (Arm)
2026-02-27 16:00 ` [PATCH v4 5/5] mm: add tracepoints for zone lock Dmitry Ilvokhin
2026-02-27 19:46   ` Steven Rostedt [this message]

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