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Open Source and information security mailing list archives
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Date: Wed, 05 May 2010 11:06:44 +0100 From: David Howells <dhowells@...hat.com> To: Michel Lespinasse <walken@...gle.com> Cc: dhowells@...hat.com, Andrew Morton <akpm@...gle.com>, Linux-MM <linux-mm@...ck.org>, Ying Han <yinghan@...gle.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: rwsem: down_read_unfair() proposal Michel Lespinasse <walken@...gle.com> wrote: > and looks like it's doable with the x86 rwsem implementation as well in a > way that would only involve changes to the rwsem spinlock-protected slow > paths in lib/rwsem.c . It's not as easy as it seems. Once an XADD-based rwsem is contended, you cannot necessarily tell without looking at the queue whether the rwsem is currently write-locked or read-locked. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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