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synchronize_net is expensive and slows down netns cleanup a lot. We have two APIs to unregister a hook: nf_unregister_net_hook (which calls synchronize_net()) and nf_unregister_net_hooks (calls nf_unregister_net_hook in a loop) Make nf_unregister_net_hook a wapper around new helper __nf_unregister_net_hook, which unlinks the hook but does not free it. Then, we can call that helper in nf_unregister_net_hooks and then call synchronize_net() only once. Andrey Konovalov reports this change improves syzkaller fuzzing speed at least twice. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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.