linux-kernel - Re: [PATCH 1/2] Report the pagesize backing a VMA in /proc/pid/smaps

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Message-Id: <20080925212025.58A3.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu, 25 Sep 2008 21:23:04 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 1/2] Report the pagesize backing a VMA in /proc/pid/smaps

Hi!

> > 1) in normal page, show PAZE_SIZE
> > 
> > because, any userland application woks as pagesize==PAZE_SIZE 
> > on current powerpc architecture.
> > 
> > because
> > 
> > fs/binfmt_elf.c
> > ------------------------------
> > static int
> > create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
> >                 unsigned long load_addr, unsigned long interp_load_addr)
> > {
> > (snip)
> >         NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
> >         NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); /* pass ELF_EXEC_PAGESIZE to libc */
> > 
> > include/asm-powerpc/elf.h
> > -----------------------------
> > #define ELF_EXEC_PAGESIZE       PAGE_SIZE 
> > 
> 
> I'm ok with this option and dropping the MMUPageSize patch as the user
> should already be able to identify that the hardware does not support 64K
> base pagesizes. I will leave the name as KernelPageSize so that it is still
> difficult to confuse it with MMU page size.
> 
> > 
> > 2) in normal page, no display any page size.
> >    only hugepage case, display page size.
> > 
> > because, An administrator want to hugepage size only. (AFAICS)
> > 
> 
> I prefer option 1 as it's easier to parse the presense of information
> than infer from the absense of it.

OK.

I'll review and test your latest patch without MMUPageSize part.
(maybe today's midnight or tommorow)

Thanks!



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