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    SubjectRe: [RFC PATCH v1 04/37] perf util: add mmap_cpu_mask__duplicate function
    Em Sat, Aug 21, 2021 at 11:19:10AM +0200, Riccardo Mancini escreveu:
    > This patch adds a new function in util/mmap.c to duplicate a mmap_cpu_mask.
    >
    > This new function will be used in the following patches.
    >
    > Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
    > ---
    > tools/perf/util/mmap.c | 12 ++++++++++++
    > tools/perf/util/mmap.h | 3 +++
    > 2 files changed, 15 insertions(+)
    >
    > diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
    > index ab7108d22428b527..9e9a447682cc962c 100644
    > --- a/tools/perf/util/mmap.c
    > +++ b/tools/perf/util/mmap.c
    > @@ -350,3 +350,15 @@ int perf_mmap__push(struct mmap *md, void *to,
    > out:
    > return rc;
    > }
    > +
    > +int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original,
    > + struct mmap_cpu_mask *clone)
    > +{
    > + clone->nbits = original->nbits;
    > + clone->bits = bitmap_alloc(original->nbits);
    > + if (!clone->bits)
    > + return -ENOMEM;
    > +
    > + memcpy(clone->bits, original->bits, MMAP_CPU_MASK_BYTES(original));
    > + return 0;
    > +}
    > diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
    > index 9d5f589f02ae70e1..b4923e587fd7749c 100644
    > --- a/tools/perf/util/mmap.h
    > +++ b/tools/perf/util/mmap.h
    > @@ -63,4 +63,7 @@ size_t mmap__mmap_len(struct mmap *map);
    >
    > void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag);
    >
    > +int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original,
    > + struct mmap_cpu_mask *clone);
    > +
    > #endif /*__PERF_MMAP_H */

    The jargon here is class__clone():

    ⬢[acme@toolbox perf]$ find tools/perf -name "*.[ch]" | xargs grep __clone
    tools/perf/util/bpf-loader.c:bpf_map_op__clone(struct bpf_map_op *op)
    tools/perf/util/bpf-loader.c:bpf_map_priv__clone(struct bpf_map_priv *priv)
    tools/perf/util/bpf-loader.c: newop = bpf_map_op__clone(pos);
    tools/perf/util/bpf-loader.c: priv = bpf_map_priv__clone(tmpl_priv);
    tools/perf/util/cgroup.c: evsel = evsel__clone(pos);
    tools/perf/util/evsel.c: * evsel__clone - create a new evsel copied from @orig
    tools/perf/util/evsel.c:struct evsel *evsel__clone(struct evsel *orig)
    tools/perf/util/evsel.h: * Please check evsel__clone() to copy them properly so that
    tools/perf/util/evsel.h:struct evsel *evsel__clone(struct evsel *orig);
    tools/perf/util/map.h:struct map *map__clone(struct map *map);
    tools/perf/util/maps.h:int maps__clone(struct thread *thread, struct maps *parent);
    tools/perf/util/parse-events.c:int parse_events_term__clone(struct parse_events_term **new,
    tools/perf/util/parse-events.c: ret = parse_events_term__clone(&n, term);
    tools/perf/util/parse-events.h:int parse_events_term__clone(struct parse_events_term **new,
    tools/perf/util/symbol.c: struct map *m = map__clone(new_map);
    tools/perf/util/thread.c:static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone)
    tools/perf/util/thread.c: return do_maps_clone ? maps__clone(thread, parent->maps) : 0;
    tools/perf/util/thread.c: return thread__clone_maps(thread, parent, do_maps_clone);
    tools/perf/util/map.c:struct map *map__clone(struct map *from)
    tools/perf/util/map.c: struct map *before = map__clone(pos);
    tools/perf/util/map.c: struct map *after = map__clone(pos);
    tools/perf/util/map.c:int maps__clone(struct thread *thread, struct maps *parent)
    tools/perf/util/map.c: struct map *new = map__clone(map);
    tools/perf/util/pmu.c: ret = parse_events_term__clone(&cloned, term);
    ⬢[acme@toolbox perf]$ find tools/perf -name "*.[ch]" | xargs grep __duplicate
    ⬢[acme@toolbox perf]$

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