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Date: Thu, 30 Jun 2016 15:04:58 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Byungchul Park <byungchul.park@lge.com>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, npiggin@suse.de,
        walken@google.com, ak@suse.de, tglx@inhelltoy.tec.linutronix.de
Subject: Re: [RFC 08/12] lockdep: Apply crossrelease to PG_locked lock
Message-ID: <20160630130458.GF30154@twins.programming.kicks-ass.net>
References: <1466398527-1122-1-git-send-email-byungchul.park@lge.com>
 <1466398527-1122-9-git-send-email-byungchul.park@lge.com>
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On Mon, Jun 20, 2016 at 01:55:23PM +0900, Byungchul Park wrote:
> @@ -215,6 +219,11 @@ struct page {
>  #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
>  	int _last_cpupid;
>  #endif
> +
> +#ifdef CONFIG_LOCKDEP_PAGELOCK
> +	struct lockdep_map map;
> +	struct cross_lock xlock;
> +#endif
>  }

So that's 32+64=96 bytes (CONFIG_LOCK_STAT=n) added to struct page,
really!?