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| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-11-07 00:07:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 19:38:42 +0300 |
| commit | 62977a9ba8dd8bafdf2190c1cfe6dfbc7f4d2569 (patch) | |
| tree | ef460ce3f3ee551425f0f71065260e22fa0b886a | |
| parent | bf75d9382bc4c57873c4193f90685058b6adf934 (diff) | |
| download | linux-62977a9ba8dd8bafdf2190c1cfe6dfbc7f4d2569.tar.xz | |
perf machine: Record if a arch has a single user/kernel address space
commit ec1891afae740be581ecf5abc8bda74c4549203f upstream.
Some architectures have a single address space for kernel and user
addresses, which makes it possible to determine if an address is in
kernel space or user space. Some don't, e.g.: sparc.
Cache that info in perf_env so that, for instance, code needing to
fallback failed symbol lookups at the kernel space in single address
space arches can lookup at userspace.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: stable@vger.kernel.org # 4.19
Link: http://lkml.kernel.org/r/20181106210712.12098-2-adrian.hunter@intel.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | tools/perf/arch/common.c | 10 | ||||
| -rw-r--r-- | tools/perf/arch/common.h | 1 | ||||
| -rw-r--r-- | tools/perf/util/machine.h | 1 | ||||
| -rw-r--r-- | tools/perf/util/session.c | 4 |
4 files changed, 16 insertions, 0 deletions
diff --git a/tools/perf/arch/common.c b/tools/perf/arch/common.c index 82657c01a3b8..5f69fd0b745a 100644 --- a/tools/perf/arch/common.c +++ b/tools/perf/arch/common.c @@ -200,3 +200,13 @@ int perf_env__lookup_objdump(struct perf_env *env, const char **path) return perf_env__lookup_binutils_path(env, "objdump", path); } + +/* + * Some architectures have a single address space for kernel and user addresses, + * which makes it possible to determine if an address is in kernel space or user + * space. + */ +bool perf_env__single_address_space(struct perf_env *env) +{ + return strcmp(perf_env__arch(env), "sparc"); +} diff --git a/tools/perf/arch/common.h b/tools/perf/arch/common.h index 2167001b18c5..c298a446d1f6 100644 --- a/tools/perf/arch/common.h +++ b/tools/perf/arch/common.h @@ -5,5 +5,6 @@ #include "../util/env.h" int perf_env__lookup_objdump(struct perf_env *env, const char **path); +bool perf_env__single_address_space(struct perf_env *env); #endif /* ARCH_PERF_COMMON_H */ diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h index d856b85862e2..ca897a73014c 100644 --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -42,6 +42,7 @@ struct machine { u16 id_hdr_size; bool comm_exec; bool kptr_restrict_warned; + bool single_address_space; char *root_dir; char *mmap_name; struct threads threads[THREADS__TABLE_SIZE]; diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 8b9369303561..11086097fc9f 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -24,6 +24,7 @@ #include "thread.h" #include "thread-stack.h" #include "stat.h" +#include "arch/common.h" static int perf_session__deliver_event(struct perf_session *session, union perf_event *event, @@ -150,6 +151,9 @@ struct perf_session *perf_session__new(struct perf_data *data, session->machines.host.env = &perf_env; } + session->machines.host.single_address_space = + perf_env__single_address_space(session->machines.host.env); + if (!data || perf_data__is_write(data)) { /* * In O_RDONLY mode this will be performed when reading the |