perf kmem: Support legacy tracepoints

Commit 11e9734bcb6a7361 ("mm/slab_common: unify NUMA and UMA version of
tracepoints") removed tracepoints 'kmalloc_node' and
'kmem_cache_alloc_node', we need to consider the tool should be backward
compatible.

If it detect the tracepoint "kmem:kmalloc_node", this patch enables the
legacy tracepoints, otherwise, it will ignore them.

Fixes: 11e9734bcb6a7361 ("mm/slab_common: unify NUMA and UMA version of tracepoints")
Reported-by: Ravi Bangoria <ravi.bangoria@amd.com>
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/r/20230108062400.250690-1-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index e20656c431a4bb8d952b30f964f0cc4deb3a0211..50a3df5dc18a87ca37ac0520970708c697ac944c 100644 (file)
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -1824,6 +1824,19 @@ static int parse_line_opt(const struct option *opt __maybe_unused,
        return 0;
 }
 
+static bool slab_legacy_tp_is_exposed(void)
+{
+       /*
+        * The tracepoints "kmem:kmalloc_node" and
+        * "kmem:kmem_cache_alloc_node" have been removed on the latest
+        * kernel, if the tracepoint "kmem:kmalloc_node" is existed it
+        * means the tool is running on an old kernel, we need to
+        * rollback to support these legacy tracepoints.
+        */
+       return IS_ERR(trace_event__tp_format("kmem", "kmalloc_node")) ?
+               false : true;
+}
+
 static int __cmd_record(int argc, const char **argv)
 {
        const char * const record_args[] = {
@@ -1831,22 +1844,28 @@ static int __cmd_record(int argc, const char **argv)
        };
        const char * const slab_events[] = {
        "-e", "kmem:kmalloc",
-       "-e", "kmem:kmalloc_node",
        "-e", "kmem:kfree",
        "-e", "kmem:kmem_cache_alloc",
-       "-e", "kmem:kmem_cache_alloc_node",
        "-e", "kmem:kmem_cache_free",
        };
+       const char * const slab_legacy_events[] = {
+       "-e", "kmem:kmalloc_node",
+       "-e", "kmem:kmem_cache_alloc_node",
+       };
        const char * const page_events[] = {
        "-e", "kmem:mm_page_alloc",
        "-e", "kmem:mm_page_free",
        };
        unsigned int rec_argc, i, j;
        const char **rec_argv;
+       unsigned int slab_legacy_tp_exposed = slab_legacy_tp_is_exposed();
 
        rec_argc = ARRAY_SIZE(record_args) + argc - 1;
-       if (kmem_slab)
+       if (kmem_slab) {
                rec_argc += ARRAY_SIZE(slab_events);
+               if (slab_legacy_tp_exposed)
+                       rec_argc += ARRAY_SIZE(slab_legacy_events);
+       }
        if (kmem_page)
                rec_argc += ARRAY_SIZE(page_events) + 1; /* for -g */
 
@@ -1861,6 +1880,10 @@ static int __cmd_record(int argc, const char **argv)
        if (kmem_slab) {
                for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++)
                        rec_argv[i] = strdup(slab_events[j]);
+               if (slab_legacy_tp_exposed) {
+                       for (j = 0; j < ARRAY_SIZE(slab_legacy_events); j++, i++)
+                               rec_argv[i] = strdup(slab_legacy_events[j]);
+               }
        }
        if (kmem_page) {
                rec_argv[i++] = strdup("-g");