Message-ID: <1335889243.13683.164.camel@twins>
Subject: Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others
From: Peter Zijlstra <peterz@infradead.org>
To: Avi Kivity <avi@redhat.com>
Cc: "Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>, mingo@elte.hu,
        jeremy@goop.org, mtosatti@redhat.com, kvm@vger.kernel.org,
        x86@kernel.org, vatsa@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
        hpa@zytor.com, paulmck <paulmck@linux.vnet.ibm.com>,
        David Rientjes <rientjes@google.com>
Date: Tue, 01 May 2012 18:20:43 +0200
In-Reply-To: <1335889139.13683.163.camel@twins>
References: <20120427161727.27082.43096.stgit@abhimanyu>
	 <20120427162401.27082.59387.stgit@abhimanyu> <4F9D32B4.8040002@redhat.com>
	 <1335865176.13683.120.camel@twins> <4F9FBF38.2060903@redhat.com>
	 <1335869827.13683.133.camel@twins> <4F9FD337.5010908@redhat.com>
	 <1335885292.13683.150.camel@twins> <4FA002F4.8000508@redhat.com>
	 <1335889139.13683.163.camel@twins>
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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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