linux-kernel - Re: [PATCH 5/6] BC: kernel memory accounting (core)

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Message-ID: <44EECC47.7080902@sw.ru>
Date:	Fri, 25 Aug 2006 14:09:11 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Oleg Nesterov <oleg@...sign.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>, Andi Kleen <ak@...e.de>,
	Greg KH <greg@...ah.com>, Matt Helsley <matthltc@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Chandra Seetharaman <sekharan@...ibm.com>
Subject: Re: [PATCH 5/6] BC: kernel memory accounting (core)

Oleg Nesterov wrote:
> On 08/23, Kirill Korotaev wrote:
> 
>>+int bc_slab_charge(kmem_cache_t *cachep, void *objp, gfp_t flags)
>>+{
>>+	unsigned int size;
>>+	struct beancounter *bc, **slab_bcp;
>>+
>>+	bc = get_exec_bc();
>>+	if (bc == NULL)
>>+		return 0;
> 
> 
> Is it possible to .exec_bc == NULL ?
> 
> If yes, why do we need init_bc? We can do 'set_exec_bc(NULL)' in __do_IRQ()
> instead.
no, exec_bc can't be NULL. thanks for catching old hunks which historically exist
due to old times when host system was not accounted (bc was NULL).

Thanks,
Kirill
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