linux-kernel - Re: [RFC][-mm][PATCH 2/6] oom-killer: count swap usage per process.

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Message-ID: <alpine.DEB.2.00.0911031144390.11821@chino.kir.corp.google.com>
Date:	Tue, 3 Nov 2009 11:47:23 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	minchan.kim@...il.com, vedran.furac@...il.com,
	Hugh Dickins <hugh.dickins@...cali.co.uk>
Subject: Re: [RFC][-mm][PATCH 2/6] oom-killer: count swap usage per
 process.

On Mon, 2 Nov 2009, KAMEZAWA Hiroyuki wrote:

> Now, anon_rss and file_rss is counted as RSS and exported via /proc.
> RSS usage is important information but one more information which
> is often asked by users is "usage of swap".(user support team said.)
> 
> This patch counts swap entry usage per process and show it via
> /proc/<pid>/status. I think status file is robust against new entry.
> Then, it is the first candidate..
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Acked-by; David Rientjes <rientjes@...gle.com>

Thanks!  I think this should be added to -mm now while the remainder of 
your patchset is developed and reviewed, it's helpful as an independent 
change.

> Index: mmotm-2.6.32-Nov2/fs/proc/task_mmu.c
> ===================================================================
> --- mmotm-2.6.32-Nov2.orig/fs/proc/task_mmu.c
> +++ mmotm-2.6.32-Nov2/fs/proc/task_mmu.c
> @@ -17,7 +17,7 @@
>  void task_mem(struct seq_file *m, struct mm_struct *mm)
>  {
>  	unsigned long data, text, lib;
> -	unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
> +	unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss, swap;
>  
>  	/*
>  	 * Note: to minimize their overhead, mm maintains hiwater_vm and
> @@ -36,6 +36,8 @@ void task_mem(struct seq_file *m, struct
>  	data = mm->total_vm - mm->shared_vm - mm->stack_vm;
>  	text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
>  	lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
> +
> +	swap = get_mm_counter(mm, swap_usage);
>  	seq_printf(m,
>  		"VmPeak:\t%8lu kB\n"
>  		"VmSize:\t%8lu kB\n"

Not sure about this newline though.
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