linux-kernel - Re: [PATCH] idr: Use this_cpu_ptr() for percpu

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Message-ID: <00000140a6e964d2-03ac778f-13ff-415d-bbfa-93cb2fddcaa5-000000@email.amazonses.com>
Date:	Thu, 22 Aug 2013 16:44:09 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Kent Overstreet <kmo@...erainc.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] idr: Use this_cpu_ptr() for percpu_ida

On Wed, 21 Aug 2013, Andrew Morton wrote:

> The lock is needed so that one cpu can steal tags from another cpu's cache.
> See (the needlessly inlined!) steal_tags().

Stealing tags could also be done via IPIs or some other things.

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