From: Christoph Lameter <cl@linux.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
netdev@vger.kernel.org, akpm@linux-foundation.org,
linux-mm@kvack.org, aravinda@linux.vnet.ibm.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
iamjoonsoo.kim@lge.com
Subject: Re: [RFC PATCH 0/3] Network stack, first user of SLAB/kmem_cache bulk free API.
Date: Fri, 4 Sep 2015 18:45:13 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.11.1509041844190.2499@east.gentwo.org> (raw)
In-Reply-To: <55EA0172.2040505@gmail.com>
On Fri, 4 Sep 2015, Alexander Duyck wrote:
> Right, but one of the reasons for Jesper to implement the bulk alloc/free is
> to avoid the cmpxchg that is being used to get stuff into or off of the per
> cpu lists.
There is no full cmpxchg used for the per cpu lists. Its a cmpxchg without
lock semantics which is very cheap.
> In the case of network drivers they are running in softirq context almost
> exclusively. As such it is useful to have a set of buffers that can be
> acquired or freed from this context without the need to use any
> synchronization primitives. Then once the softirq context ends then we can
> free up some or all of the resources back to the slab allocator.
That is the case in the slab allocators.
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next prev parent reply other threads:[~2015-09-04 23:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-24 0:58 [PATCH V2 0/3] slub: introducing detached freelist Jesper Dangaard Brouer
2015-08-24 0:58 ` [PATCH V2 1/3] slub: extend slowpath __slab_free() to handle bulk free Jesper Dangaard Brouer
2015-08-24 0:59 ` [PATCH V2 2/3] slub: optimize bulk slowpath free by detached freelist Jesper Dangaard Brouer
2015-08-24 0:59 ` [PATCH V2 3/3] slub: build detached freelist with look-ahead Jesper Dangaard Brouer
2015-09-04 17:00 ` [RFC PATCH 0/3] Network stack, first user of SLAB/kmem_cache bulk free API Jesper Dangaard Brouer
2015-09-04 17:00 ` [RFC PATCH 1/3] net: introduce kfree_skb_bulk() user of kmem_cache_free_bulk() Jesper Dangaard Brouer
2015-09-04 18:47 ` Tom Herbert
2015-09-07 8:41 ` Jesper Dangaard Brouer
2015-09-07 16:25 ` Tom Herbert
2015-09-07 20:14 ` Jesper Dangaard Brouer
2015-09-08 21:01 ` David Miller
2015-09-04 17:01 ` [RFC PATCH 2/3] net: NIC helper API for building array of skbs to free Jesper Dangaard Brouer
2015-09-04 17:01 ` [RFC PATCH 3/3] ixgbe: bulk free SKBs during TX completion cleanup cycle Jesper Dangaard Brouer
2015-09-04 18:09 ` [RFC PATCH 0/3] Network stack, first user of SLAB/kmem_cache bulk free API Alexander Duyck
2015-09-04 18:55 ` Christoph Lameter
2015-09-04 20:39 ` Alexander Duyck
2015-09-04 23:45 ` Christoph Lameter [this message]
2015-09-05 11:18 ` Jesper Dangaard Brouer
2015-09-08 17:32 ` Christoph Lameter
2015-09-09 12:59 ` Jesper Dangaard Brouer
2015-09-09 14:08 ` Christoph Lameter
2015-09-07 8:16 ` Jesper Dangaard Brouer
2015-09-07 21:23 ` Alexander Duyck
2015-09-16 10:02 ` Experiences with slub bulk use-case for network stack Jesper Dangaard Brouer
2015-09-16 15:13 ` Christoph Lameter
2015-09-17 20:17 ` Jesper Dangaard Brouer
2015-09-17 23:57 ` Christoph Lameter
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