linux-kernel - Re: [RFCv2][PATCH] add some drop_caches documentation and info messsge

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Date:	Fri, 17 Sep 2010 08:54:01 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	lnxninja@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	ebiederm@...ssion.com
Subject: Re: [RFCv2][PATCH] add some drop_caches documentation and info
 messsge

On Fri, 2010-09-17 at 09:26 +0900, KOSAKI Motohiro wrote:
> > diff -puN fs/drop_caches.c~update-drop_caches-documentation fs/drop_caches.c
> > --- linux-2.6.git/fs/drop_caches.c~update-drop_caches-documentation	2010-09-16 09:43:52.000000000 -0700
> > +++ linux-2.6.git-dave/fs/drop_caches.c	2010-09-16 09:43:52.000000000 -0700
> > @@ -47,6 +47,8 @@ int drop_caches_sysctl_handler(ctl_table
> >  {
> >  	proc_dointvec_minmax(table, write, buffer, length, ppos);
> >  	if (write) {
> > +		printk(KERN_NOTICE "%s (%d): dropped kernel caches: %d\n",
> > +			current->comm, task_pid_nr(current), sysctl_drop_caches);
> >  		if (sysctl_drop_caches & 1)
> >  			iterate_supers(drop_pagecache_sb, NULL);
> >  		if (sysctl_drop_caches & 2)
> 
> Can't you print it only once?

Sure.  But, I also figured that somebody calling it every minute is
going to be much more interesting than something just on startup.
Should we printk_ratelimit() it, perhaps?

-- Dave

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