linux-kernel - Re: [patch] vmscan: print shrink_slab symbol name on negative shrinker objects

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Date:	Thu, 19 Mar 2009 16:33:14 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] vmscan: print shrink_slab symbol name on negative
 shrinker objects

On Thu, 19 Mar 2009 16:09:33 -0700 (PDT) David Rientjes <rientjes@...gle.com> wrote:

> When a shrinker has a negative number of objects to delete, the symbol
> name of the shrinker should be printed, not shrink_slab.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  mm/vmscan.c |    9 +++++++--
>  1 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -40,6 +40,7 @@
>  #include <linux/memcontrol.h>
>  #include <linux/delayacct.h>
>  #include <linux/sysctl.h>
> +#include <linux/kallsyms.h>
>  
>  #include <asm/tlbflush.h>
>  #include <asm/div64.h>
> @@ -214,8 +215,12 @@ unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
>  		do_div(delta, lru_pages + 1);
>  		shrinker->nr += delta;
>  		if (shrinker->nr < 0) {
> -			printk(KERN_ERR "%s: nr=%ld\n",
> -					__func__, shrinker->nr);
> +			char symname[KSYM_NAME_LEN];
> +
> +			if (lookup_symbol_name((unsigned long)shrinker->shrink,
> +					       symname) > 0)
> +				printk(KERN_ERR "shrink_slab: %s nr=%ld\n",
> +				       symname, shrinker->nr);
>  			shrinker->nr = max_pass;
>  		}

Can we use the new printk("%pF", ...) here?
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