From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Will Deacon <will@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
John Garry <john.garry@huawei.com>,
Andi Kleen <ak@linux.intel.com>,
Riccardo Mancini <rickyman7@gmail.com>,
Jin Yao <yao.jin@linux.intel.com>,
Li Huafei <lihuafei1@huawei.com>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Leo Yan <leo.yan@linaro.org>, Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH v1 1/3] perf env: Track kernel 64-bit mode in environment
Date: Mon, 9 Aug 2021 19:27:25 +0800 [thread overview]
Message-ID: <20210809112727.596876-2-leo.yan@linaro.org> (raw)
In-Reply-To: <20210809112727.596876-1-leo.yan@linaro.org>
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
based on the info.
This patch adds an item "kernel_is_64_bit" into session's environment
structure perf_env, its value is initialized based on the architecture
string.
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
tools/perf/util/env.c | 24 +++++++++++++++++++++++-
tools/perf/util/env.h | 3 +++
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index ab341050be46..8f7ff0035c41 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -219,13 +219,35 @@ 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
+ env->kernel_is_64_bit = -1;
+}
+
+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))
+ env->kernel_is_64_bit = 1;
+ else
+ env->kernel_is_64_bit = 0;
+}
+
+int perf_env__kernel_is_64_bit(struct perf_env *env)
+{
+ if (env->kernel_is_64_bit == -1)
+ perf_env__init_kernel_mode(env);
+
+ return env->kernel_is_64_bit;
}
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..1f5175820a05 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -61,6 +61,7 @@ struct perf_env {
unsigned long long total_mem;
unsigned int msr_pmu_type;
unsigned int max_branches;
+ int kernel_is_64_bit;
int nr_cmdline;
int nr_sibling_cores;
@@ -143,6 +144,8 @@ extern struct perf_env perf_env;
void perf_env__exit(struct perf_env *env);
+int perf_env__kernel_is_64_bit(struct perf_env *env);
+
int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);
int perf_env__read_cpuid(struct perf_env *env);
--
2.25.1
next prev parent reply other threads:[~2021-08-09 11:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-09 11:27 [PATCH v1 0/3] perf: Support compat mode for AUX ring buffer Leo Yan
2021-08-09 11:27 ` Leo Yan [this message]
2021-08-09 20:11 ` [PATCH v1 1/3] perf env: Track kernel 64-bit mode in environment Arnaldo Carvalho de Melo
2021-08-09 11:27 ` [PATCH v1 2/3] perf auxtrace: Add compat_auxtrace_mmap__{read_head|write_tail} Leo Yan
2021-08-09 20:12 ` Arnaldo Carvalho de Melo
2021-08-12 9:23 ` Adrian Hunter
2021-08-13 16:22 ` James Clark
2021-08-23 9:51 ` Leo Yan
2021-08-23 10:57 ` James Clark
2021-08-23 12:13 ` Leo Yan
2021-08-23 16:00 ` James Clark
2021-08-24 2:13 ` Leo Yan
2021-08-09 11:27 ` [PATCH v1 3/3] perf auxtrace arm: Support compat_auxtrace_mmap__{read_head|write_tail} Leo Yan
2021-08-23 12:23 ` James Clark
2021-08-23 13:30 ` Leo Yan
2021-08-23 13:39 ` Russell King (Oracle)
2021-08-23 14:54 ` Leo Yan
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