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Message-ID: <565FAC78.3030205@redhat.com> Date: Thu, 3 Dec 2015 10:44:08 +0800 From: Xunlei Pang <xlpang@...hat.com> To: Peter Zijlstra <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Steven Rostedt <rostedt@...dmis.org> Subject: Re: [PATCH] sched/core: Clear the root_domain cpumasks in init_rootdomain() Hi Peter, On 12/03/2015 at 12:25 AM, Peter Zijlstra wrote: > On Wed, Dec 02, 2015 at 09:12:30PM +0800, Xunlei Pang wrote: >> Hi Peter, >> >> On 12/02/2015 at 08:34 PM, Peter Zijlstra wrote: >>> On Wed, Dec 02, 2015 at 07:52:59PM +0800, Xunlei Pang wrote: >>>> The patch cleans the garbage by using zalloc_cpumask_var() >>>> instead of alloc_cpumask_var() for root_domain::rto_mask >>>> allocation, thereby addressing the issues. >>> How did you notice this? Also do we want to do the same for the kmalloc >> When doing review. > Nice, will you be looking for similar issues elsewhere in the scheduler > too? Sure :-) >>> in alloc_rootdomain() ? >> There is a "memset(rd, 0, sizeof(*rd))" in init_rootdomain(), >> so I don't think we need to do this in alloc_rootdomain(). > Ah, right there is. Which also clears the mask for small systems. Yeah, maybe we can improve it using alloc_cpumask_var() with __GFP_ZERO instead of zalloc_cpumask_var() to avoid duplicate clean for small systems. Regards, Xunlei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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