linux-kernel - Re: [rfc] "fair" rw spinlocks

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Message-ID: <87638zvvjg.fsf@basil.nowhere.org>
Date:	Wed, 25 Nov 2009 09:49:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	npiggin@...e.de, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [rfc] "fair" rw spinlocks

David Miller <davem@...emloft.net> writes:
>
> I think nobody would notice if you changed tasklist_lock into
> a spinlock_t, and this would solve the DoS because at least on
> x86 you'd end up with the ticket spinlocks.

iirc tasklist_lock was one of them who could be potentially nested.

So just turning it into a spinlock might deadlock.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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