Merge branch 'net-mitigate-kmem_free-slowpath'

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Jesper Dangaard Brouer says:

====================
net: mitigating kmem_cache free slowpath

This patchset is the first real use-case for kmem_cache bulk _free_.
The use of bulk _alloc_ is NOT included in this patchset. The full use
have previously been posted here [1].

The bulk free side have the largest benefit for the network stack
use-case, because network stack is hitting the kmem_cache/SLUB
slowpath when freeing SKBs, due to the amount of outstanding SKBs.
This is solved by using the new API kmem_cache_free_bulk().

Introduce new API napi_consume_skb(), that hides/handles bulk freeing
for the caller.  The drivers simply need to use this call when freeing
SKBs in NAPI context, e.g. replacing their calles to dev_kfree_skb() /
dev_consume_skb_any().

Driver ixgbe is the first user of this new API.

[1] http://thread.gmane.org/gmane.linux.network/384302/focus=397373
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

David S. Miller 2016-02-11 11:59:17 -05:00

parent 18ac5590e9 a3a8749d34

commit 3134b9f019

4 changed files with 96 additions and 10 deletions

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6

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

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4

include/linux/skbuff.h

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9

net/core/dev.c

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87

net/core/skbuff.c

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