linux-kernel - Re: [PATCH 11/30] mm: __GFP

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Message-Id: <20080725183835.86AC.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 25 Jul 2008 18:39:43 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	kosaki.motohiro@...fujitsu.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, trond.myklebust@....uio.no,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 11/30] mm: __GFP_MEMALLOC

> On Fri, 2008-07-25 at 18:29 +0900, KOSAKI Motohiro wrote:
> > Hi Peter,
> > 
> > > __GFP_MEMALLOC will allow the allocation to disregard the watermarks, 
> > > much like PF_MEMALLOC.
> > > 
> > > It allows one to pass along the memalloc state in object related allocation
> > > flags as opposed to task related flags, such as sk->sk_allocation.
> > 
> > Is this properly name?
> > page alloc is always "mem alloc".
> > 
> > you wrote comment as "Use emergency reserves" and 
> > this flag works to turn on ALLOC_NO_WATERMARKS.
> > 
> > then, __GFP_NO_WATERMARK or __GFP_EMERGENCY are better?
> 
> We've been through this pick a better name thing several times :-/
> 
> Yes I agree, __GFP_MEMALLOC is a misnomer, however its consistent with
> PF_MEMALLOC and __GFP_NOMEMALLOC - of which people know the semantics.
> 
> Creating a new name with similar semantics can only serve to confuse.

Ah, understand.
Thanks.

Agreed to __GFP_MEMALLOC.

> 
> So unless enough people think its worth renaming all of them, I think
> we're better off with this name.



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