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perf tools: Handle injected guest kernel mmap event 

If a kernel mmap event was recorded inside a guest and injected into a host
perf.data file, then it will match a host mmap_name not a guest mmap_name,
see machine__set_mmap_name(). So try matching a host mmap_name in that
case.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-27-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-07-11 12:32:09 +03:00 committed by Arnaldo Carvalho de Melo
parent eef8e06eeb
commit f42bbbf2e9
1 changed files with 12 additions and 3 deletions
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15
tools/perf/util/machine.c
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@ -1742,6 +1742,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
struct map *map;
enum dso_space_type dso_space;
bool is_kernel_mmap;
const char *mmap_name = machine->mmap_name;
/* If we have maps from kcore then we do not need or want any others */
if (machine__uses_kcore(machine))
@ -1752,8 +1753,16 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
else
dso_space = DSO_SPACE__KERNEL_GUEST;
is_kernel_mmap = memcmp(xm->name, machine->mmap_name,
strlen(machine->mmap_name) - 1) == 0;
is_kernel_mmap = memcmp(xm->name, mmap_name, strlen(mmap_name) - 1) == 0;
if (!is_kernel_mmap && !machine__is_host(machine)) {
/*
* If the event was recorded inside the guest and injected into
* the host perf.data file, then it will match a host mmap_name,
* so try that - see machine__set_mmap_name().
*/
mmap_name = "[kernel.kallsyms]";
is_kernel_mmap = memcmp(xm->name, mmap_name, strlen(mmap_name) - 1) == 0;
}
if (xm->name[0] == '/' ||
(!is_kernel_mmap && xm->name[0] == '[')) {
map = machine__addnew_module_map(machine, xm->start,
@ -1767,7 +1776,7 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
dso__set_build_id(map->dso, bid);
} else if (is_kernel_mmap) {
const char *symbol_name = (xm->name + strlen(machine->mmap_name));
const char *symbol_name = xm->name + strlen(mmap_name);
/*
* Should be there already, from the build-id table in
* the header.