linux-kernel - Re: [PATCH 2/6] BC: beancounters core (API)

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Message-Id: <200608231337.48941.ak@suse.de>
Date:	Wed, 23 Aug 2006 13:37:48 +0200
From:	Andi Kleen <ak@...e.de>
To:	Kirill Korotaev <dev@...ru>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Rik van Riel <riel@...hat.com>, Greg KH <greg@...ah.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Chandra Seetharaman <sekharan@...ibm.com>
Subject: Re: [PATCH 2/6] BC: beancounters core (API)

On Wednesday 23 August 2006 13:03, Kirill Korotaev wrote:

> +#ifdef CONFIG_BEANCOUNTERS
> +extern struct hlist_head bc_hash[];
> +extern spinlock_t bc_hash_lock;

I wonder who pokes into that hash from other files? Looks a bit dangerous.

> +void __put_beancounter(struct beancounter *bc);
> +static inline void put_beancounter(struct beancounter *bc)
> +{
> +	__put_beancounter(bc);
> +}

The wrapper seems pointless too.

The file could use a overview comment what the various counter
types actually are.

> +	bc_print_id(bc, uid, sizeof(uid));
> +	printk(KERN_WARNING "BC %s %s warning: %s "

Doesn't this need some rate limiting? Or can it be only triggered
by code bugs?


> +	bc = &default_beancounter;
> +	memset(bc, 0, sizeof(default_beancounter));

You don't trust the BSS to be zero? @)
 
-Andi
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