On Wed, Feb 23, 2022 at 4:05 PM Hao Luo <haoluo@xxxxxxxxxx> wrote: > > For binaries that are statically linked, consecutive stack frames are > likely to be in the same VMA and therefore have the same build id. > As an optimization for this case, we can cache the previous frame's > VMA, if the new frame has the same VMA as the previous one, reuse the > previous one's build id. We are holding the MM locks as reader across > the entire loop, so we don't need to worry about VMA going away. > > Tested through "stacktrace_build_id" and "stacktrace_build_id_nmi" in > test_progs. > > Suggested-by: Greg Thelen <gthelen@xxxxxxxxxx> > Signed-off-by: Hao Luo <haoluo@xxxxxxxxxx> Nice optimization! Acked-by: Song Liu <songliubraving@xxxxxx>
