linux-kernel - Re: [PATCH] show per-process swap usage via procfs v3

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Message-Id: <20091113113502.9c5a93b7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 13 Nov 2009 11:35:02 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	akpm@...ux-foundation.org,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH] show per-process swap usage via procfs v3

On Fri, 13 Nov 2009 10:51:12 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > > @@ -597,7 +600,9 @@ copy_one_pte(struct mm_struct *dst_mm, s
> > >  						 &src_mm->mmlist);
> > >  				spin_unlock(&mmlist_lock);
> > >  			}
> > > -			if (is_write_migration_entry(entry) &&
> > > +			if (!non_swap_entry(entry))
> > > +				rss[2]++;
> > > +			else if (is_write_migration_entry(entry) &&
> > >  					is_cow_mapping(vm_flags)) {
> > >  				/*
> > 
> > What are the implications for fork performance?
> 
> This path is executed when page table entry contains a entry of
>   !pte_none() && !pte_present().
> 
> There are not very big chance to reach here.(this path is under unlikely()).
> 

[before]
 text    data     bss     dec     hex filename
6649003 3221828 10232816        20103647        132c1df vmlinux
[after]
   text    data     bss     dec     hex filename
6649243 3221828 10232816        20103887        132c2cf vmlinux

Now, 240 bytes of text size..Hmm.

Thanks,
-Kame

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