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perf tools: Add machine__kernel_ip()

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Add a function to determine if an address is in the kernel.  This is
based on the kernel function kernel_ip().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1408129739-17368-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2014-08-15 22:08:39 +03:00 • committed by Arnaldo Carvalho de Melo
parent 4b99375b38
commit fbe2af45f6
3 changed files with 43 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

23
tools/perf/util/machine.c
View file

@ -32,6 +32,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
machine->symbol_filter = NULL;
machine->id_hdr_size = 0;
machine->comm_exec = false;
machine->kernel_start = 0;
machine->root_dir = strdup(root_dir);
if (machine->root_dir == NULL)
@ -1559,3 +1560,25 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
return 0;
}
int machine__get_kernel_start(struct machine *machine)
{
struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
int err = 0;
/*
* The only addresses above 2^63 are kernel addresses of a 64-bit
* kernel. Note that addresses are unsigned so that on a 32-bit system
* all addresses including kernel addresses are less than 2^32. In
* that case (32-bit system), if the kernel mapping is unknown, all
* addresses will be assumed to be in user space - see
* machine__kernel_ip().
*/
machine->kernel_start = 1ULL << 63;
if (map) {
err = map__load(map, machine->symbol_filter);
if (map->start)
machine->kernel_start = map->start;
}
return err;
}