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

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Message-ID: <44EC57BD.4020807@sw.ru>
Date:	Wed, 23 Aug 2006 17:27:25 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Andi Kleen <ak@...e.de>
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)

Andi Kleen wrote:
> 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.
it was kernel/ub/proc.c with proc interface :)
however, we removed it from this patchset version, but forgot extern's...

will remove

>>+void __put_beancounter(struct beancounter *bc);
>>+static inline void put_beancounter(struct beancounter *bc)
>>+{
>>+	__put_beancounter(bc);
>>+}
> 
> 
> The wrapper seems pointless too.
yep, almost the same reason :)

> The file could use a overview comment what the various counter
> types actually are.
you mean comment about what resource parameters we introduce?
ok, will add it with each resource patch.

>>+	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?
only due to code bugs.

>>+	bc = &default_beancounter;
>>+	memset(bc, 0, sizeof(default_beancounter));
> 
> 
> You don't trust the BSS to be zero? @)
:))

Kirill
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