From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org
Subject: Re: [PATCH 6/6] cls_cgroup: remove redundant rcu_read_lock/unlock
Date: Wed, 01 Feb 2012 02:10:02 -0500 (EST) [thread overview]
Message-ID: <20120201.021002.1399660597996401402.davem@davemloft.net> (raw)
In-Reply-To: <1328080039.22641.2.camel@edumazet-laptop>
From: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 01 Feb 2012 08:07:19 +0100
> Then, I wonder why we do the "if (classid && classid != sk->sk_classid)"
>
> before the :
>
> sk->sk_classid = classid;
>
> This seems unnecessary checks.
>
Avoiding dirtying the sk->sk_classid cache line unnecessarily?
I actually have no idea actually how often this routine can get
invoked in real world scenerios.
next prev parent reply other threads:[~2012-02-01 7:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 6:55 [PATCH 1/6] netprio_cgroup: fix an off-by-one bug Li Zefan
2012-02-01 6:55 ` [PATCH 3/6] netprio_cgroup: fix wrong memory access when NETPRIO_CGROUP=m Li Zefan
2012-02-01 6:56 ` [PATCH 4/6] netprio_cgroup: use IS_ENABLED() and family Li Zefan
[not found] ` <4F28E203.10502-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 6:59 ` David Miller
[not found] ` <20120201.015954.2098592611164231843.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2012-02-01 7:06 ` Li Zefan
[not found] ` <4F28E48D.3040505-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 7:07 ` David Miller
2012-02-01 7:22 ` Li Zefan
[not found] ` <4F28E853.7000104-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 12:02 ` Neil Horman
[not found] ` <4F28E1D1.900-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 6:55 ` [PATCH 2/6] netprio_cgroup: don't allocate prio table when a device is registered Li Zefan
2012-02-01 6:56 ` [PATCH 5/6] cls_cgroup: use IS_ENABLED() and family Li Zefan
2012-02-01 6:56 ` [PATCH 6/6] cls_cgroup: remove redundant rcu_read_lock/unlock Li Zefan
[not found] ` <4F28E22A.703-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 7:07 ` Eric Dumazet
2012-02-01 7:10 ` David Miller [this message]
2012-02-01 7:20 ` Li Zefan
[not found] ` <4F28E7A0.6000309-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-02-01 7:23 ` Herbert Xu
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