[PATCH v4 10/11] perf env: Set flag for kernel is 64-bit mode
From: Leo Yan
Date: Sun Jul 11 2021 - 06:41:52 EST
It's useful to know that the kernel is running in 32-bit or 64-bit
mode. E.g. We can decide if perf tool is running in compat mode
from this info.
This patch adds a global variable "kernel_is_64_bit", it's initialized
when a session setups environment, its value is decided by checking the
architecture string.
Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
---
tools/perf/util/env.c | 17 ++++++++++++++++-
tools/perf/util/env.h | 1 +
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index ebc5e9ad35db..345635a2e842 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -11,6 +11,7 @@
#include <stdlib.h>
#include <string.h>
+int kernel_is_64_bit;
struct perf_env perf_env;
#ifdef HAVE_LIBBPF_SUPPORT
@@ -172,6 +173,19 @@ static void perf_env__purge_bpf(struct perf_env *env __maybe_unused)
}
#endif // HAVE_LIBBPF_SUPPORT
+static void perf_env__init_kernel_mode(struct perf_env *env)
+{
+ const char *arch = perf_env__raw_arch(env);
+
+ if (!strncmp(arch, "x86_64", 6) || !strncmp(arch, "aarch64", 7) ||
+ !strncmp(arch, "arm64", 5) || !strncmp(arch, "mips64", 6) ||
+ !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) ||
+ !strncmp(arch, "s390x", 5) || !strncmp(arch, "sparc64", 7))
+ kernel_is_64_bit = 1;
+ else
+ kernel_is_64_bit = 0;
+}
+
void perf_env__exit(struct perf_env *env)
{
int i;
@@ -217,13 +231,14 @@ void perf_env__exit(struct perf_env *env)
zfree(&env->hybrid_cpc_nodes);
}
-void perf_env__init(struct perf_env *env __maybe_unused)
+void perf_env__init(struct perf_env *env)
{
#ifdef HAVE_LIBBPF_SUPPORT
env->bpf_progs.infos = RB_ROOT;
env->bpf_progs.btfs = RB_ROOT;
init_rwsem(&env->bpf_progs.lock);
#endif
+ perf_env__init_kernel_mode(env);
}
int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[])
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 6824a7423a2d..cc989ff49740 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -139,6 +139,7 @@ enum perf_compress_type {
struct bpf_prog_info_node;
struct btf_node;
+extern int kernel_is_64_bit;
extern struct perf_env perf_env;
void perf_env__exit(struct perf_env *env);
--
2.25.1