This patchset introduces two new operations which essentially splits the SECCOMP_SET_MODE_FILTER process into two steps: SECCOMP_LOAD_FILTER and SECCOMP_ATTACH_FILTER. The SECCOMP_LOAD_FILTER loads the filter and returns a fd which can be pinned to bpffs. This extends the lifetime of the filter and thus can be reused by different processes. With this new operation, we can eliminate a hot path of JITing BPF program (the filter) where we apply the same seccomp filter to thousands of micro VMs on a bare metal instance. The SECCOMP_ATTACH_FILTER is used to attach a loaded filter. The filter is represented by a fd which is either returned from SECCOMP_LOAD_FILTER or obtained from bpffs using bpf syscall. Hengqi Chen (2): seccomp: Introduce SECCOMP_LOAD_FILTER operation seccomp: Introduce SECCOMP_ATTACH_FILTER operation include/uapi/linux/seccomp.h | 2 + kernel/seccomp.c | 138 ++++++++++++++++++++++++++++++++++- 2 files changed, 136 insertions(+), 4 deletions(-) -- 2.34.1
