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

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Date:	Thu, 12 Nov 2009 10:20:29 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	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 Wed, 11 Nov 2009, KAMEZAWA Hiroyuki wrote:

>
> Index: mm-test-kernel/include/linux/mm_types.h
> ===================================================================
> --- mm-test-kernel.orig/include/linux/mm_types.h
> +++ mm-test-kernel/include/linux/mm_types.h
> @@ -228,6 +228,7 @@ struct mm_struct {
>  	 */
>  	mm_counter_t _file_rss;
>  	mm_counter_t _anon_rss;
> +	mm_counter_t _swap_usage;

This is going to be another hit on vm performance if we get down this
road.

At least put

#ifdef CONFIG_SWAP ?

around this so that we can switch it off?

> @@ -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?
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