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authorLeo Yan <leo.yan@linaro.org>2023-01-08 14:23:59 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2023-01-10 10:52:49 -0300
commitb3719108ae60169eda5c941ca5e1be1faa371c57 (patch)
treef849bba5eaf20193dd9ecfac51f73a8635838f56 /tools/perf/builtin-kmem.c
parentd891f2b724b39a2a41e3ad7b57110193993242ff (diff)
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>
Diffstat (limited to 'tools/perf/builtin-kmem.c')
-rw-r--r--tools/perf/builtin-kmem.c29
1 files changed, 26 insertions, 3 deletions
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index e20656c431a4..50a3df5dc18a 100644
--- 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");