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[ Upstream commit e1608f3fa857b600045b6df7f7dadc70eeaa4496 ] For the case where the interpreter is compiled out or when the prog is jited it is completely unnecessary to set the BPF insn pages as read-only. In fact, on frequent churn of BPF programs, it could lead to performance degradation of the system over time since it would break the direct map down to 4k pages when calling set_memory_ro() for the insn buffer on x86-64 / arm64 and there is no reverse operation. Thus, avoid breaking up large pages for data maps, and only limit this to the module range used by the JIT where it is necessary to set the image read-only and executable. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20191129222911.3710-1-daniel@iogearbox.net Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.