linux-kernel - Re: [PATCH] ipc/sem.c: fix lockup, restore FIFO behavior

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Message-ID: <51A0D5DD.1060409@colorfullife.com>
Date:	Sat, 25 May 2013 17:16:45 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Rik van Riel <riel@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>, hhuang@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] ipc/sem.c: fix lockup, restore FIFO behavior

Hi Rik,

On 05/25/2013 03:49 PM, Rik van Riel wrote:
> On 05/25/2013 04:54 AM, Manfred Spraul wrote:
>>
>> But: Let's wait if this really exists: An application that does rarely
>> complex operations (and that doesn't prefer FIFO semantics).
>
> I do not like that downside at all.
>
> The danger of staying in "too slow to be useful" mode forever
> is really not a risk I want to take.
>

I've modified the patch so that it leaves the mode as soon as possible.
Are you aware of any real-life apps that use multiple semops?

--
     Manfred
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