linux-kernel - Re: [PATCH-v3 1/4] idr: Percpu ida

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Message-Id: <20130828141544.b3cafb57b05ced5f0ba64766@linux-foundation.org>
Date:	Wed, 28 Aug 2013 14:15:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	target-devel <target-devel@...r.kernel.org>,
	lf-virt <virtualization@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	kvm-devel <kvm@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, Asias He <asias@...hat.com>,
	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Lameter <cl@...two.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH-v3 1/4] idr: Percpu ida

On Wed, 28 Aug 2013 14:12:17 -0700 Kent Overstreet <kmo@...erainc.com> wrote:

> How's this look?
> 
> diff --git a/lib/idr.c b/lib/idr.c
> index 15c021c..a3f8e9a 100644
> --- a/lib/idr.c
> +++ b/lib/idr.c
> @@ -1288,6 +1288,11 @@ static inline unsigned alloc_local_tag(struct percpu_ida *pool,
>   * Safe to be called from interrupt context (assuming it isn't passed
>   * __GFP_WAIT, of course).
>   *
> + * @gfp indicates whether or not to wait until a free id is available (it's not
> + * used for internal memory allocations); thus if passed __GFP_WAIT we may sleep
> + * however long it takes until another thread frees an id (same semantics as a
> + * mempool).

Looks good.  Mentioning the mempool thing is effective - people
understand that.
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