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perf kcore_copy: Fix module map when there are no modules loaded 

In the absence of any modules, no "modules" map is created, but there
are other executable pages to map, due to eBPF JIT, kprobe or ftrace.
Map them by recognizing that the first "module" symbol is not
necessarily from a module, and adjust the map accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20200512121922.8997-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-05-12 15:19:16 +03:00 committed by Arnaldo Carvalho de Melo
parent 0bdf31811b
commit 61f82e3fb6
1 changed files with 7 additions and 0 deletions
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7
tools/perf/util/symbol-elf.c
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@ -1458,6 +1458,7 @@ struct kcore_copy_info {
u64 first_symbol;
u64 last_symbol;
u64 first_module;
u64 first_module_symbol;
u64 last_module_symbol;
size_t phnum;
struct list_head phdrs;
@ -1534,6 +1535,8 @@ static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
return 0;
if (strchr(name, '[')) {
if (!kci->first_module_symbol || start < kci->first_module_symbol)
kci->first_module_symbol = start;
if (start > kci->last_module_symbol)
kci->last_module_symbol = start;
return 0;
@ -1731,6 +1734,10 @@ static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir,
kci->etext += page_size;
}
if (kci->first_module_symbol &&
(!kci->first_module || kci->first_module_symbol < kci->first_module))
kci->first_module = kci->first_module_symbol;
kci->first_module = round_down(kci->first_module, page_size);
if (kci->last_module_symbol) {