linux-kernel - [PATCH 0/3] rework netlink skb allocation

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Message-ID: <1566467448-9550-1-git-send-email-jan.dakinevich@virtuozzo.com>
Date:   Thu, 22 Aug 2019 09:50:50 +0000
From:   Jan Dakinevich <jan.dakinevich@...tuozzo.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Denis Lunev <den@...tuozzo.com>,
        Konstantin Khorenko <khorenko@...tuozzo.com>
Subject: [PATCH 0/3] rework netlink skb allocation

Currently, userspace is able to initiate costly high-order allocation in 
kernel sending large broadcast netlink message, which is considered 
undesirable. At the same time, unicast message are safe in this regard, 
because they uses vmalloc-ed memory.

This series introduces changes, that allow broadcast messages to be 
allocated with vmalloc() as well as unicast.

Jan Dakinevich (3):
  skbuff: use kvfree() to deallocate head
  netlink: always use vmapped memory for skb data
  netlink: use generic skb_set_owner_r()

 include/linux/netlink.h   | 16 ----------------
 net/core/skbuff.c         |  2 +-
 net/ipv4/fib_frontend.c   |  2 +-
 net/netfilter/nfnetlink.c |  2 +-
 net/netlink/af_netlink.c  | 39 +++++++--------------------------------
 5 files changed, 10 insertions(+), 51 deletions(-)

-- 
2.1.4