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Giuseppe Scrivano says:
"SELinux, if enabled, registers for each new network namespace 6
netfilter hooks."
Cost for this is high. With synchronize_net() removed:
"The net benefit on an SMP machine with two cores is that creating a
new network namespace takes -40% of the original time."
This patch replaces synchronize_net+kvfree with call_rcu().
We store rcu_head at the tail of a structure that has no fixed layout,
i.e. we cannot use offsetof() to compute the start of the original
allocation. Thus store this information right after the rcu head.
We could simplify this by just placing the rcu_head at the start
of struct nf_hook_entries. However, this structure is used in
packet processing hotpath, so only place what is needed for that
at the beginning of the struct.
Reported-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.