• Joel Fernandes's avatar
    ramoops: Split ftrace buffer space into per-CPU zones · a1cf53ac
    Joel Fernandes authored
    If the RAMOOPS_FLAG_FTRACE_PER_CPU flag is passed to ramoops pdata, split
    the ftrace space into multiple zones depending on the number of CPUs.
    This speeds up the performance of function tracing by about 280% in my
    tests as we avoid the locking. The trade off being lesser space available
    per CPU. Let the ramoops user decide which option they want based on pdata
    Signed-off-by: default avatarJoel Fernandes <joelaf@google.com>
    [kees: added max_ftrace_cnt to track size, added DT logic and docs]
    Signed-off-by: default avatarKees Cook <keescook@chromium.org>