Re: [RESEND Patch] kcore: remove its pointless size
From: KAMEZAWA Hiroyuki
Date: Mon Jul 20 2009 - 22:13:01 EST
On Fri, 17 Jul 2009 15:29:55 -0700
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 2 Jul 2009 09:41:38 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> I think I'm about to forget about the above issues. If everyone else
> does the same, they won't get addressed. Oh well.
>
> And I still need to decide whether
> kcore-fix-proc-kcores-statst_size.patch fixes things up sufficiently
> well to justify merging it.
>
Hmm, I read fs/proc/kcore.c and feel followng, now.
- kclist doesn't handle memory hole, then, it will never be "correct" size.
For example, arch/x86/mm/init.c calls kclist_add() as following
715 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
716 VMALLOC_END-VMALLOC_START);
Wow, extremely big anyway.
- Then, yes. Size of /proc/kcode is pointless. Anyway, what's important is
not "size", but ELF phder of kcore.
To this patch,
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
BTW, I'd like to look into handling physical memory range for /proc/kcore.
IMHO, kclist for physical memory is not necessary...it's handled by /proc/iomem.
"kdump" uses this information and it's properly maintained by memory hotplug.
I'd like to try some pathces and make kclist_add() for physical memory cleaner,
later.
Thanks,
-Kame
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