Re: [PATCH v5 1/2] perf pmus: Sort pmus by name then suffix

[Ian Rogers]

On Fri, Aug 25, 2023 at 1:23 PM Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> Em Fri, Aug 25, 2023 at 06:52:36AM -0700, Ian Rogers escreveu:
> > Sort PMUs by name. If two PMUs have the same name but differ by
> > suffix, sort the suffixes numerically. For example, "breakpoint" comes
> > before "cpu", "uncore_imc_free_running_0" comes before
> > "uncore_imc_free_running_1". Suffixes need to be treated specially as
> > otherwise they will be ordered like 0, 1, 10, 11, .., 2, 20, 21, ..,
> > etc. Only PMUs starting 'uncore_' are considered to have a potential
> > suffix.
> >
> > Sorting of PMUs is done so that later patches can skip duplicate
> > uncore PMUs that differ only by there suffix.
> >
> > Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> > ---
> >  tools/perf/util/pmus.c | 48 ++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >
> > diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
> > index 4dd5912617ff..b1f6a64693fe 100644
> > --- a/tools/perf/util/pmus.c
> > +++ b/tools/perf/util/pmus.c
> > @@ -1,8 +1,10 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  #include <linux/list.h>
> > +#include <linux/list_sort.h>
> >  #include <linux/zalloc.h>
> >  #include <subcmd/pager.h>
> >  #include <sys/types.h>
> > +#include <ctype.h>
> >  #include <dirent.h>
> >  #include <pthread.h>
> >  #include <string.h>
> > @@ -33,6 +35,31 @@ static LIST_HEAD(other_pmus);
> >  static bool read_sysfs_core_pmus;
> >  static bool read_sysfs_all_pmus;
> >
> > +static int pmu_name_len_no_suffix(const char *str, unsigned long *num)
> > +{
> > +     int orig_len, len;
> > +
> > +     orig_len = len = strlen(str);
> > +
> > +     /* Non-uncore PMUs have their full length, for example, i915. */
> > +     if (strncmp(str, "uncore_", 7))
> > +             return len;
> > +
> > +     /*
> > +      * Count trailing digits and '_', if '_{num}' suffix isn't present use
> > +      * the full length.
> > +      */
> > +     while (len > 0 && isdigit(str[len - 1]))
> > +             len--;
> > +
> > +     if (len > 0 && len != orig_len && str[len - 1] == '_') {
> > +             if (num)
> > +                     *num = strtoul(&str[len], NULL, 10);
> > +             return len - 1;
> > +     }
> > +     return orig_len;
> > +}
> > +
> >  void perf_pmus__destroy(void)
> >  {
> >       struct perf_pmu *pmu, *tmp;
> > @@ -122,6 +149,25 @@ static struct perf_pmu *perf_pmu__find2(int dirfd, const char *name)
> >       return perf_pmu__lookup(core_pmu ? &core_pmus : &other_pmus, dirfd, name);
> >  }
> >
> > +static int pmus_cmp(void *priv __maybe_unused,
> > +                 const struct list_head *lhs, const struct list_head *rhs)
> > +{
> > +     unsigned long lhs_num, rhs_num;
> > +     struct perf_pmu *lhs_pmu = container_of(lhs, struct perf_pmu, list);
> > +     struct perf_pmu *rhs_pmu = container_of(rhs, struct perf_pmu, list);
> > +     const char *lhs_pmu_name = lhs_pmu->name ?: "";
> > +     const char *rhs_pmu_name = rhs_pmu->name ?: "";
> > +     int lhs_pmu_name_len = pmu_name_len_no_suffix(lhs_pmu_name, &lhs_num);
> > +     int rhs_pmu_name_len = pmu_name_len_no_suffix(rhs_pmu_name, &rhs_num);
> > +     int ret = strncmp(lhs_pmu_name, rhs_pmu_name,
> > +                     lhs_pmu_name_len < rhs_pmu_name_len ? lhs_pmu_name_len : rhs_pmu_name_len);
> > +
> > +     if (lhs_pmu_name_len != rhs_pmu_name_len || ret != 0 || lhs_pmu_name_len == 0)
> > +             return ret;
> > +
> > +     return lhs_num < rhs_num ? -1 : (lhs_num > rhs_num ? 1 : 0);
> > +}
>
> Also, I got this in some distros/gcc versions:
>
>   31    12.95 opensuse:15.5                 : FAIL gcc version 7.5.0 (SUSE Linux)
>     util/pmus.c: In function 'pmus_cmp':
>     util/pmus.c:169:57: error: 'lhs_num' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>       return lhs_num < rhs_num ? -1 : (lhs_num > rhs_num ? 1 : 0);
>                                       ~~~~~~~~~~~~~~~~~~~~~~~^~~~
>     cc1: all warnings being treated as errors
>     make[3]: *** [/git/perf-6.5.0-rc5/tools/build/Makefile.build:150: util] Error 2
>
> I applied this, please check.

Makes sense, thanks!

Ian

> diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
> index bbf84ccc3aba7d5c..7316da1c0ddb8eaf 100644
> --- a/tools/perf/util/pmus.c
> +++ b/tools/perf/util/pmus.c
> @@ -153,7 +153,7 @@ static struct perf_pmu *perf_pmu__find2(int dirfd, const char *name)
>  static int pmus_cmp(void *priv __maybe_unused,
>                     const struct list_head *lhs, const struct list_head *rhs)
>  {
> -       unsigned long lhs_num, rhs_num;
> +       unsigned long lhs_num = 0, rhs_num = 0;
>         struct perf_pmu *lhs_pmu = container_of(lhs, struct perf_pmu, list);
>         struct perf_pmu *rhs_pmu = container_of(rhs, struct perf_pmu, list);
>         const char *lhs_pmu_name = lhs_pmu->name ?: "";