linux-kernel - Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb

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Message-ID: <1335889243.13683.164.camel@twins>
Date:	Tue, 01 May 2012 18:20:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, mingo@...e.hu,
	jeremy@...p.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	x86@...nel.org, vatsa@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	paulmck <paulmck@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others

On Tue, 2012-05-01 at 18:18 +0200, Peter Zijlstra wrote:

> ---
>  mm/oom_kill.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 46bf2ed5..244a371 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -607,6 +607,9 @@ int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_mask)
>  	struct zone *zone;
>  	int ret = 1;
>  
> +	synchronize_sched();
> +	synchronize_rcu();
> +
>  	spin_lock(&zone_scan_lock);
>  	for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
>  		if (zone_is_oom_locked(zone)) {
> 

Hmm I guess that should be rcu_barrier_sched(); rcu_barrier(); instead
of sync.
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