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

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Message-Id: <1156379788.7154.34.camel@linuxchandra>
Date:	Wed, 23 Aug 2006 17:36:28 -0700
From:	Chandra Seetharaman <sekharan@...ibm.com>
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>, Andi Kleen <ak@...e.de>,
	Greg KH <greg@...ah.com>, Oleg Nesterov <oleg@...sign.ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>
Subject: Re: [PATCH 5/6] BC: kernel memory accounting (core)

On Wed, 2006-08-23 at 15:06 +0400, Kirill Korotaev wrote:

<snip>

> --- ./include/bc/beancounter.h.bckmem	2006-07-28 18:43:52.000000000 +0400
> +++ ./include/bc/beancounter.h	2006-08-03 16:03:01.000000000 +0400
> @@ -14,7 +14,9 @@
>   *	Resource list.
>   */
>  
> -#define BC_RESOURCES	0
> +#define BC_KMEMSIZE	0
> +
> +#define BC_RESOURCES	1

As suggested before, a clean interface to define these would be better
>  
>  struct resource_parm {
>  	/*
> --- ./include/bc/kmem.h.bckmem	2006-07-28 18:43:52.000000000 +0400
> +++ ./include/bc/kmem.h	2006-07-31 17:37:05.000000000 +0400
> @@ -0,0 +1,33 @@
> +/*
> + *  include/bc/kmem.h
> + *
> + *  Copyright (C) 2006 OpenVZ. SWsoft Inc
> + *
> + */
> +
> +#ifndef __BC_KMEM_H_
> +#define __BC_KMEM_H_
> +
> +#include <linux/config.h>
> +
> +/*
> + * BC_KMEMSIZE accounting
> + */
> +
> +struct mm_struct;
> +struct page;
> +struct beancounter;
> +
> +#ifdef CONFIG_BEANCOUNTERS
> +int  bc_page_charge(struct page *page, int order, gfp_t flags);
> +void bc_page_uncharge(struct page *page, int order);
> +
> +int bc_slab_charge(kmem_cache_t *cachep, void *obj, gfp_t flags);
> +void bc_slab_uncharge(kmem_cache_t *cachep, void *obj);
> +#else
> +#define bc_page_charge(pg, o, mask)	(0)
> +#define bc_page_uncharge(pg, o)		do { } while (0)
> +#define bc_slab_charge(cachep, o, f)	(0)
> +#define bc_slab_uncharge(cachep, o)	do { } while (0)
> +#endif
> +#endif /* __BC_SLAB_H_ */
> --- ./kernel/bc/Makefile.bcsys	2006-07-28 14:08:37.000000000 +0400
> +++ ./kernel/bc/Makefile	2006-08-01 11:08:39.000000000 +0400
> @@ -7,3 +7,4 @@
>  obj-$(CONFIG_BEANCOUNTERS) += beancounter.o
>  obj-$(CONFIG_BEANCOUNTERS) += misc.o
>  obj-$(CONFIG_BEANCOUNTERS) += sys.o
> +obj-$(CONFIG_BEANCOUNTERS) += kmem.o
> --- ./kernel/bc/beancounter.c.bckmem	2006-07-28 18:43:52.000000000 +0400
> +++ ./kernel/bc/beancounter.c	2006-08-03 16:14:17.000000000 +0400
> @@ -19,6 +19,7 @@ static void init_beancounter_struct(stru
>  struct beancounter init_bc;
>  
>  const char *bc_rnames[] = {
> +	"kmemsize",	/* 0 */
>  };

As suggested before, a clean interface would be a better idea.
>  
>  #define bc_hash_fun(x) ((((x) >> 8) ^ (x)) & (BC_HASH_SIZE - 1))
> @@ -348,6 +378,8 @@ static void init_beancounter_syslimits(s
>  {
>  	int k;
>  
> +	bc->bc_parms[BC_KMEMSIZE].limit = 32 * 1024 * 1024;
> +

This could be either be a configurable value by/for the controller or
can be set by the controller through a callout.

>  	for (k = 0; k < BC_RESOURCES; k++)
>  		bc->bc_parms[k].barrier = bc->bc_parms[k].limit;
>  }

<snip>

-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@...ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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