linux-kernel - Re: [PATCH 2/5] percpu_ida: Move waking up waiters out of atomic contexts

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Message-ID: <20131028212140.GG8153@kmo>
Date:	Mon, 28 Oct 2013 14:21:40 -0700
From:	Kent Overstreet <kmo@...erainc.com>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] percpu_ida: Move waking up waiters out of atomic
 contexts

On Mon, Oct 28, 2013 at 11:05:25AM +0100, Alexander Gordeev wrote:
> Currently percpu_ida_free() waikes up waiters always with local
> interrupts disabled and sometimes with pool->lock held. Yet, it
> does not appear there is any reason why it could not be done out
> of these atomic contexts.

This should be a noticable performance boost, nested irqsave/restore is painful.

Acked-by: Kent Overstreet <kmo@...erainc.com>
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