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

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Date:	Tue, 30 Jul 2013 08:08:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	kamezawa.hiroyu@...fujitsu.com, bp@...e.de,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH resend] drop_caches: add some documentation and info
 message

On Tue, 30 Jul 2013 07:47:12 -0700 Dave Hansen <dave.hansen@...el.com> 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.

	/bin/drop_caches "slab|pagecache"

That we always insist on doing such things in the kernel instead is
exhibit #1 in Why We Suck.

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