diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-11-06 22:07:10 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-12-17 18:54:07 +0100 |
| commit | ec1891afae740be581ecf5abc8bda74c4549203f (patch) | |
| tree | c149a4b9797127900933cab6b20b09841660e510 /tools/perf/util | |
| parent | perf env: Also consider env->arch == NULL as local operation (diff) | |
| download | linux-ec1891afae740be581ecf5abc8bda74c4549203f.tar.xz linux-ec1891afae740be581ecf5abc8bda74c4549203f.zip | |
perf machine: Record if a arch has a single user/kernel address space
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>
Diffstat (limited to 'tools/perf/util')
| -rw-r--r-- | tools/perf/util/machine.h | 1 | ||||
| -rw-r--r-- | tools/perf/util/session.c | 4 |
2 files changed, 5 insertions, 0 deletions
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 7d2c8ce6cfad..f8eab197f35c 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 |