Messages in this thread | | | From | Namhyung Kim <> | Date | Thu, 24 Feb 2022 10:13:05 -0800 | Subject | Re: [PATCH bpf-next v2] bpf: Cache the last valid build_id. |
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Hello,
On Wed, Feb 23, 2022 at 6:31 PM Song Liu <song@kernel.org> wrote: > > On Wed, Feb 23, 2022 at 4:05 PM Hao Luo <haoluo@google.com> 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@google.com> > > Signed-off-by: Hao Luo <haoluo@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Thanks, Namhyung
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