linux-kernel - Re: [PATCH resend] drop_caches: add some documentation and info message

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Message-ID: <51F9D1F6.4080001@jp.fujitsu.com>
Date:	Wed, 31 Jul 2013 23:11:50 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	akpm@...ux-foundation.org
CC:	mhocko@...e.cz, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	dave.hansen@...el.com, kosaki.motohiro@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, bp@...e.de, dave@...ux.vnet.ibm.com
Subject: Re: [PATCH resend] drop_caches: add some documentation and info message

>> --- a/fs/drop_caches.c
>> +++ b/fs/drop_caches.c
>> @@ -59,6 +59,8 @@ int drop_caches_sysctl_handler(ctl_table *table, int write,
>>  	if (ret)
>>  		return ret;
>>  	if (write) {
>> +		printk(KERN_INFO "%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)
> 
> How about we do
> 
> 	if (!(sysctl_drop_caches & 4))
> 		printk(....)
> 
> so people can turn it off if it's causing problems?

The best interface depends on the purpose. If you want to detect crazy application,
we can't assume an application co-operate us. So, I doubt this works.

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