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From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	linux-rt-users@vger.kernel.org
Cc: Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH RT] mm: Warn on memory allocation in non-preemptible context on RT
Date: Fri, 6 Mar 2020 17:40:37 +0100	[thread overview]
Message-ID: <67d03e4c-09be-ff63-1cde-1398aec730a8@redhat.com> (raw)
In-Reply-To: <20200306160315.irbxjl3md4edsf7x@linutronix.de>

On 3/6/20 5:03 PM, Sebastian Andrzej Siewior wrote:
> The memory allocation via kmalloc(, GFP_ATOMIC) in atomic context
> (disabled preemption or interrupts) is not allowed on RT because the
> buddy allocator is using sleeping locks which can't be acquired in this
> context.
> Such an an allocation may not trigger a warning in the buddy allocator
> if it is always satisfied in the SLUB allocator.
> 
> Add a warning on RT if a memory allocation was attempted in not
> preemptible region.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>

Thanks!
-- Daniel


      reply	other threads:[~2020-03-06 16:40 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06 16:03 [PATCH RT] mm: Warn on memory allocation in non-preemptible context on RT Sebastian Andrzej Siewior
2020-03-06 16:40 ` Daniel Bristot de Oliveira [this message]

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