Re: [RFC v1 01/16] perf kwork: Fix incorrect and missing free atom in work_push_atom()

[Yang Jihong]

Hello,

On 2023/9/4 12:05, Ian Rogers wrote:
> On Sat, Aug 12, 2023 at 1:52 AM Yang Jihong <yangjihong1@xxxxxxxxxx> wrote:
> > 1. Atoms are managed in page mode and should be released using atom_free()
> >     instead of free().
> > 2. When the event does not match, the atom needs to free.
> >
> > Fixes: f98919ec4fcc ("perf kwork: Implement 'report' subcommand")
> > Signed-off-by: Yang Jihong <yangjihong1@xxxxxxxxxx>
>
> Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Thanks for review-by tag.
> > ---
> >   tools/perf/builtin-kwork.c | 6 ++++--
> >   1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
> > index 14bf7a8429e7..73b5dc099a8a 100644
> > --- a/tools/perf/builtin-kwork.c
> > +++ b/tools/perf/builtin-kwork.c
> > @@ -406,12 +406,14 @@ static int work_push_atom(struct perf_kwork *kwork,
> >
> >          work = work_findnew(&class->work_root, &key, &kwork->cmp_id);
> >          if (work == NULL) {
> > -               free(atom);
> > +               atom_free(atom);
>
> Presumably this is fixing a memory-leak. It would be nice if kwork had
> perf tests, then our builds with -fsanitize=address would highlight
> this kind of issue. Here is a build command I use for this:
> make -C tools/perf O=/tmp/perf DEBUG=1 EXTRA_CFLAGS="-O0 -g
> -fno-omit-frame-pointer -fsanitize=address" BUILD_BPF_SKEL=1
> NO_LIBTRACEEVENT=1
Okay, I'm going to add the kwork test in perf tests.

Thanks,
Yang