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perf machine: Synthesize and process mmap events for x86 PTI entry trampolines

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Like the kernel text, the location of x86 PTI entry trampolines must be
recorded in the perf.data file. Like the kernel, synthesize a mmap event
for that, and add processing for it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1526986485-6562-10-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-05-22 13:54:37 +03:00 • committed by Arnaldo Carvalho de Melo
parent 1c5aae7710
commit a8ce99b0ee
5 changed files with 140 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

28
tools/perf/util/machine.c
View file

@ -1387,6 +1387,32 @@ static bool machine__uses_kcore(struct machine *machine)
return false;
}
static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
union perf_event *event)
{
return machine__is(machine, "x86_64") &&
is_entry_trampoline(event->mmap.filename);
}
static int machine__process_extra_kernel_map(struct machine *machine,
union perf_event *event)
{
struct map *kernel_map = machine__kernel_map(machine);
struct dso *kernel = kernel_map ? kernel_map->dso : NULL;
struct extra_kernel_map xm = {
.start = event->mmap.start,
.end = event->mmap.start + event->mmap.len,
.pgoff = event->mmap.pgoff,
};
if (kernel == NULL)
return -1;
strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
return machine__create_extra_kernel_map(machine, kernel, &xm);
}
static int machine__process_kernel_mmap_event(struct machine *machine,
union perf_event *event)
{
@ -1490,6 +1516,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
*/
dso__load(kernel, machine__kernel_map(machine));
}
} else if (perf_event__is_extra_kernel_mmap(machine, event)) {
return machine__process_extra_kernel_map(machine, event);
}
return 0;
out_problem: