linux-kernel - Re: [PATCH] writeback: call writeback tracepoints withoud holding list_lock in wb

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Message-ID: <20160225190940.35553f4e@grimm.local.home>
Date:	Thu, 25 Feb 2016 19:09:40 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Shi, Yang" <yang.shi@...aro.org>
Cc:	tj@...nel.org, jack@...e.cz, axboe@...com, fengguang.wu@...el.com,
	tglx@...utronix.de, bigeasy@...utronix.de,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-rt-users@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] writeback: call writeback tracepoints withoud holding
 list_lock in wb_writeback()

On Thu, 25 Feb 2016 15:54:13 -0800
"Shi, Yang" <yang.shi@...aro.org> wrote:


> Can we disable irqs in tracepoints since spin_lock_irqsave is used by 
> kernfs_* functions.

Disabling preemption or irqs is fine a tracepoint. You just can't
sleep, which spin_lock_irqsave() would do on the -rt kernel.

-- Steve