linux-kernel - Re: Badness with the kernel version 2.6.35-rc1-git1 running on P6 box

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Message-ID: <1279282842.2549.16.camel@edumazet-laptop>
Date:	Fri, 16 Jul 2010 14:20:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	divya <dipraksh@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	sachinp@...ux.vnet.ibm.com, benh@...nel.crashing.org,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jan-Bernd Themann <ossthema@...ibm.com>
Subject: Re: Badness with the kernel version 2.6.35-rc1-git1 running on P6
 box

Le vendredi 16 juillet 2010 à 11:56 +0200, Eric Dumazet a écrit :

> [PATCH] ehea: ehea_get_stats() should use GFP_KERNEL
> 
> ehea_get_stats() is called in process context and should use GFP_KERNEL
> allocation instead of GFP_ATOMIC.
> 
> Clearing stats at beginning of ehea_get_stats() is racy in case of
> concurrent stat readers.
> 
> get_stats() can also use netdev net_device_stats, instead of a private
> copy.
> 
> Reported-by: divya <dipraksh@...ux.vnet.ibm.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>  drivers/net/ehea/ehea.h      |    1 -
>  drivers/net/ehea/ehea_main.c |    6 ++----
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 
> 

Hmm, net-next-2.6 contains following patch :

commit 3d8009c780ee90fccb5c171caf30aff839f13547
Author: Brian King <brking@...ux.vnet.ibm.com>
Date:   Wed Jun 30 11:59:12 2010 +0000

    ehea: Allocate stats buffer with GFP_KERNEL
    
    Since ehea_get_stats calls ehea_h_query_ehea_port, which
    can sleep, we can also sleep when allocating a page in
    this function. This fixes some memory allocation failure
    warnings seen under low memory conditions.
    
    Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 8b92acb..3beba70 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -335,7 +335,7 @@ static struct net_device_stats
*ehea_get_stats(struct net_device *dev)
 
        memset(stats, 0, sizeof(*stats));
 
-       cb2 = (void *)get_zeroed_page(GFP_ATOMIC);
+       cb2 = (void *)get_zeroed_page(GFP_KERNEL);
        if (!cb2) {
                ehea_error("no mem for cb2");
                goto out;


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