Re: [patch] vmscan: print shrink_slab symbol name on negativeshrinker objects
From: Ingo Molnar
Date: Fri Mar 20 2009 - 04:28:53 EST
* David Rientjes <rientjes@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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;
Please dont open-code lookup_symbol_name() for function pointers -
we have %pF for such purposes.
Btw., probably all existing print_symbol() uses in mm/*.c should be
converted to %pF:
mm/memory.c: print_symbol(KERN_ALERT "vma->vm_ops->fault: %s\n",
mm/memory.c: print_symbol(KERN_ALERT "vma->vm_file->f_op->mmap: %s\n",
mm/slab.c: print_symbol("(%s)",
mm/slub.c: len += sprint_symbol(buf + len, (unsigned long)l->addr);
mm/slub.c: int n = sprint_symbol(buf, (unsigned long)s->ctor);
mm/vmalloc.c: sprint_symbol(buff, (unsigned long)v->caller);
[ Except the second slub.c one which should be %pS ]
Ingo
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