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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>
This commit is contained in:
Adrian Hunter 2018-11-06 23:07:10 +02:00 committed by Arnaldo Carvalho de Melo
parent 804234f271
commit ec1891afae
4 changed files with 16 additions and 0 deletions
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10
tools/perf/arch/common.c
View File

@ -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");
}

1
tools/perf/arch/common.h
View File

@ -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 */

1
tools/perf/util/machine.h
View File

@ -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];

4
tools/perf/util/session.c
View File

@ -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