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

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Message-ID: <20130730145405.GA23365@pd.tnic>
Date:	Tue, 30 Jul 2013 16:54:05 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH resend] drop_caches: add some documentation and info
 message

On Tue, Jul 30, 2013 at 07:47:12AM -0700, Dave Hansen wrote:
> On 07/30/2013 05:55 AM, Michal Hocko wrote:
> >> > If we add another flag in the future it can use bit 3?
> > What if we get crazy and need more of them?
> 
> I really hate using bits for these kinds of interfaces.  I'm forgetful
> and never remember which bit is which, and they're possible to run out of.
> 
> I'm not saying do it now, but we can switch over to:
> 
> 	echo 'slab|pagecache' > drop_caches
> or
> 	echo 'quiet|slab' > drop_caches
> 
> any time we want and still have compatibility with the existing bitwise
> interface.

Hohum, definitely a nice idea at a first glance. And when you cat
drop_caches, it could show you what all those commands mean and how you
can issue them, i.e. allowed syntax etc.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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