linux-kernel - Re: [PATCH 2/2] block: Convert BDI proportion calculations to flexible proportions

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Date:	Tue, 29 May 2012 14:38:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] block: Convert BDI proportion calculations to
 flexible proportions

On Tue, 2012-05-29 at 14:34 +0200, Jan Kara wrote:

> The only safe solution seems to be to create a variant of percpu counters
> that can be used from an interrupt. Or do you have other idea Peter?

> > [   20.680186]  [<ffffffff8325ac9b>] _raw_spin_lock+0x3b/0x70
> > [   20.680186]  [<ffffffff81993527>] ? __percpu_counter_sum+0x17/0xc0
> > [   20.680186]  [<ffffffff81993527>] __percpu_counter_sum+0x17/0xc0
> > [   20.680186]  [<ffffffff810ebf90>] ? init_timer_deferrable_key+0x20/0x20
> > [   20.680186]  [<ffffffff8195b5c2>] fprop_new_period+0x12/0x60
> > [   20.680186]  [<ffffffff811d929d>] writeout_period+0x3d/0xa0
> > [   20.680186]  [<ffffffff810ec0bf>] call_timer_fn+0x12f/0x260
> > [   20.680186]  [<ffffffff810ebf90>] ? init_timer_deferrable_key+0x20/0x20

Yeah, just make sure IRQs are disabled around doing that ;-)


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